Arithmetic Ninja for Ages 8-9 9781801990639, 9781801990646, 1801990638
112 25
English Pages [138]
Cover
Title
Copyright
Contents
Introduction
Week 1
Week 2
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
Week 9
Week 10
Week 11
Week 12
Week 13
Week 14
Week 15
Week 16
Week 17
Week 18
Week 19
Week 20
Week 21
Week 22
Week 23
Week 24
Week 25
Week 26
Week 27
Week 28
Week 29
Week 30
Week 31
Week 32
Week 33
Week 34
Week 35
Week 36
Week 37
Week 38
Week 39
Answers
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ANDREW JENNINGS WITH SARAH FARRELL
ARITHMETIC
NINJA
FOR AGES 8–9
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BLOOMSBURY EDUCATION Bloomsbury Publishing Plc 50 Bedford Square, London, WC1B 3DP, UK 29 Earlsfort Terrace, Dublin 2, Ireland BLOOMSBURY, BLOOMSBURY EDUCATION and the Diana logo are trademarks of Bloomsbury Publishing Plc First published in Great Britain, 2022 This edition published in Great Britain, 2022 Text copyright © Andrew Jennings, 2022 Ninja illustrations copyright © Andrew Jennings, 2022 Andrew Jennings and Sarah Farrell have asserted their rights under the Copyright, Designs and Patents Act, 1988, to be identified as Authors of this work Bloomsbury Publishing Plc does not have any control over, or responsibility for, any third-party websites referred to or in this book. All internet addresses given in this book were correct at the time of going to press. The author and publisher regret any inconvenience caused if addresses have changed or sites have ceased to exist, but can accept no responsibility for any such changes All rights reserved. This book may be photocopied, for use in the educational establishment for which it was purchased, but may not be reproduced in any other form or by any other means – graphic, electronic, or mechanical, including photocopying, recording, taping or information storage or retrieval systems – without prior permission in writing of the publishers A catalogue record for this book is available from the British Library ISBN: PB: 978-1-8019-9063-9; ePDF: 978-1-8019-9064-6
Text design by Marcus Duck Design
To find out more about our authors and books visit www.bloomsbury.com and sign up for our newsletters
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CONTENTS INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . 5 WEEK 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 WEEK 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 WEEK 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 WEEK 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 WEEK 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 WEEK 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 WEEK 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 WEEK 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 WEEK 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 WEEK 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 WEEK 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 WEEK 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 WEEK 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 WEEK 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 WEEK 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 WEEK 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 WEEK 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 WEEK 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 WEEK 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 WEEK 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 WEEK 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 WEEK 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 WEEK 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 WEEK 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 WEEK 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 WEEK 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 WEEK 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 WEEK 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 WEEK 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 WEEK 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 WEEK 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 WEEK 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 WEEK 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 WEEK 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 WEEK 35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 WEEK 36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 WEEK 37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 WEEK 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 WEEK 39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 ANSWERS. . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
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OTHER NINJA RESOURCES FOR TEACHERS FOR TEACHERS
TIMES TABLE NINJA BY SARAH FARRELL AND ANDREW JENNINGS A treasure trove of photocopiable multiplication worksheets that give Key Stage 2 pupils all the tools they need to gain fluency in multiplication and division up to their 12 times tables. Each chapter begins with exercises for practising rapid recall, followed by visually engaging activities for applying knowledge to other areas of maths including shape, perimeter, scale factors, fractions and more.
COMPREHENSION NINJA FICTION & POETRY A set of six books for ages 5–11 that provide strategies and carefully curated resources to teach the key comprehension skills of skimming, scanning and retrieving information effectively. Each book curates 24 high-quality fiction or poetry texts by authors such as Roald Dahl, Katherine Rundell and Chitra Soundar, alongside photocopiable activities with strong links to the National Curriculum.
VOCABULARY NINJA
COMPREHENSION NINJA NON-FICTION
A practical guide featuring strategies and photocopiable activities to help transform pupils into vocabulary ninjas. With easyto-follow theory and teaching approaches, as well as key curriculum topic vocabulary, etymology and phrases, this book will help bring the primary curriculum to life.
A set of six books for ages 5–11 that provide strategies and carefully curated resources to teach the key comprehension skills of skimming, scanning and retrieving information effectively. Each book presents 24 high-quality non-fiction texts and photocopiable activities with strong links to the National Curriculum.
FOR CHILDREN WRITE LIKE A NINJA
BE A MATHS NINJA
A pocket-sized book packed full of all the grammar, vocabulary and sentence structures that children need in order to improve and develop their writing skills. Fully aligned to the Key Stage 2 National Curriculum, this book is designed to be used independently by pupils both in the classroom and at home.
Be a Maths Ninja is jam-packed with key concepts, mathematical vocabulary and practice advice to support every child’s growing independence in maths. It covers all the key areas of the National Curriculum for Key Stage 2 and is perfect for children needing all the important maths facts at their fingertips.
Head to www.vocabularyninja.co.uk and follow @VocabularyNinja on Twitter for more teaching and learning resources to support the teaching of vocabulary, reading, writing and the wider primary curriculum.
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INTRODUCTION Arithmetic is the study of a core part of mathematics that involves the varied properties of numbers and how they can be manipulated using the four operations: addition, subtraction, multiplication and division. A pupil’s ability to confidently calculate using the four operations is essential as it underpins their ability to access the reasoning and mastery objectives set out by the primary National Curriculum.
HOW DOES ARITHMETIC NINJA SUPPORT TEACHERS AND SCHOOLS? Arithmetic Ninja has been created to support the daily planning, preparation, teaching and assessment of arithmetic throughout each year group and across the whole school from Year 1 to Year 6. Each book contains almost 6,000 arithmeticstyle questions and word problems that have been tailored to meet the needs of the primary National Curriculum, meaning that high-quality, whole-school arithmetic teaching and learning can be consistently and effectively embedded within each classroom without any of the timeconsuming preparation. It’s teaching simplified, learning amplified. Arithmetic Ninja is another outstanding whole-school resource that embodies the Vocabulary Ninja principles of simplicity, consistency and marginal gains!
HOW TO USE THIS BOOK Arithmetic Ninja is much more than just a series of age-related arithmetic questions. Each day provides three differentiated sets of ten questions. Grasshopper, Shinobi and Grand Master each have a specific focus and purpose to support all pupils in the modern primary classroom. GRASSHOPPER – CATCH-UP AND KEEP UP Grasshopper questions have been designed to support pupils who are not working at the expected standard of their year group and require daily opportunities for repeated practice within a standard mathematical representation of part + part = whole (10 + 4 = 14). Grasshopper questions provide opportunities to build confidence in
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
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content from three half-terms prior to the age-related expectation. So, questions in the Spring 2 term will include content from Autumn 2, Spring 1 and Spring 2, allowing pupils to not only catch-up, but keep up too! SHINOBI – BUILD LINKS AND MAKE CONNECTIONS Shinobi questions have been created beyond the standard age-related expectation for arithmetic questions. The focus at the Shinobi level is to provide an age-appropriate arithmetic resource – one that provides regular opportunities for pupils to build links and make connections between related mathematical facts. Within the daily series of ten questions, questions have been carefully crafted to allow pupils to make cognitive links between related facts. For example, 9 x 8 = 72 and within the Shinobi series, subsequent questions may focus on 0.8 x 9, 7.2 ÷ 9 or even 0.9 x 0.8. Where possible, the Shinobi strand provides teachers with the mathematical opportunities to dive deeper into a pupil’s understanding with effective questioning to support the link-building process and to make these crucial connections. GRAND MASTER – VARIED FLUENCY, REPRESENTATION AND MASTERY Grand Master questions provide pupils with a greater level of challenge, with questions bridging into mathematical content up to three half-terms beyond the age-related expectation. So, questions in the Autumn 2 term could also contain content from Spring 1 and Spring 2. Grand Master questions go even further still by presenting questions with varied representations such as whole = part + part (200 = 160 + 40) or questions with unknown parts (200 = __ + 40). Grand Master questions allow teachers to provide a greater level of challenge for pupils who are ready for it and are designed to provide opportunities for pupils to develop a mastery level of mathematical understanding. Each Arithmetic Ninja book is an extremely versatile resource for teachers, schools and tutors and could be used to begin daily maths lessons, as part of high-quality intervention, within private tuition or even as part of regular homework provision.
5
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Autumn term 1: Weeks 1–6 • Number bonds to 10 (alternate representations, e.g. 10 = __ + 4) • Subtract one- and two-digit numbers within 20 (15 – 3 / 15 – 4 / 15 – 5) • Include language of 1 less • Double • Count in 2s (lots of)
Autumn term 2: Weeks 7–12 • Number bonds to 20 (19 + 1 / 1 + 19) • Add and subtract one- and twodigit numbers within 20 (answer box at beginning OR missing number question, e.g. __ – 7 = 9 OR __ = 16 – 9) • Count in 5s (lots of) • 1 more to 50 • 5 + 5 • Half
Spring term 1: Weeks 13–18
• Add and subtract two-digit • Add and subtract two two-digit numbers and tens (34 + 10 / 34 + 20 numbers (56 – 22 / 56 – 23 / / 34 + 30) 56 – 24) • Derive related facts to 100 • Add three one-digit numbers (3 + 4 = 30 / 30 + 40 = 70 / (1 + 5 + 7 / 1 + 4 + 8) 70 = 30 + 40) • 5 times table • Thirds
• Number bonds to 20 (alternate representations, e.g. 20 = __ + 1) • Add and subtract one- and twodigit numbers within 20 (answer box at beginning OR missing number question, e.g. __ – 7 = 9 OR __ = 16 – 9) • Count in 5s (lots of) • 1 less to 50 • 5 + 5 • Half
Spring term 2: Weeks 19–25
• Add and subtract one- and twodigit numbers within 20 (alternate representations including answer box at the beginning AND missing number, e.g. 7 = __ – 9) • Count in 10s (lots of) • 10 + 10 • Quarter • 1 more to 100
Summer term 1: Weeks 26–32
• Three-digit numbers subtract hundreds (456 – 200 / – 300 / – 400) • Derive related facts to 1,000 • Divide one-digit numbers by ten (40 / 10 then 4 / 10) • Non-unit fraction of number (e.g.) relating to times tables
• Add and subtract two two-digit numbers (56 + __ = 79 / 79 = __ + 56) • 5 and 10 times tables
• Mixed adding and subtracting within 20 (alternate representations) and within 30 • Mixed counting in 2s, 5s and 10s • Quarter • 1 less to 100 • Mixed 1 more and 1 less in different representations
Summer term 2: Weeks 33–39
Content map for Arithmetic Ninja Year 1 (for ages 5-6)
• Number bonds to 10, e.g. 9 + 1 / 1+ 9 • Add one- and two-digit numbers within 20 (13 + 1 / 13 + 2 / 13 + 3) • Include language of 1 more • Double • Count in 2s (lots of)
• Addition and subtraction within 20 • Partition two-digit numbers in different ways (20 + 3 / 10 + 13) • Double and half • Quarter
• Three-digit numbers add hundreds (456 + 200 / + 300 / + 400) • Add and subtract three-digit numbers (246 – __ = 132 / 456 = __ + 321) • Derive related facts to 1,000 • Two-digit times one-digit numbers (45 x 3 / 45 x 4)
• Add and subtract decimals (hundredths) • Derive related facts to 10,000 (including fractions of numbers) • Three-digit numbers divided by one-digit numbers
• 10 / 100 / 1000 more / less • Partition numbers in different ways • Add and subtract decimals (complements of 1, e.g. 100 – 76 = __ / 1 – 0.76 =__) • All times tables, including deriving related facts
• 10 / 100 more / less • Mixed times tables (2, 5, 10, 3, 4, 8, including double, half, quarter, etc.) • Multiply three numbers • Add and subtract fractions (same denominators)
• 10 / 100 / 1,000 more / less • Partition four-digit numbers in different ways (3,005 + 340 / 3,300 + 45) • Derive related facts to 10,000 (e.g. 60 x 2) • Unit fractions of numbers
Year 2 (for ages 6-7)
• Add and subtract two-digit and one-digit numbers (34 + 3 / 34 + 5 / 34 + 6) • Using the inverse (1 + 2 = 3 / 3 – 2 = 1) • 2 times table • Half / two quarters
• Three-digit numbers subtract tens (456 – 20 / – 30 / – 40) • Add and subtract three-digit numbers (246 – 123 / 123 + 246) • Distribute (4 x 12 x 5 / 4 x 5 x 12 / 20 x 12 = 240) • Mixed times tables • Unit fractions of numbers linking to those times tables
• Add and subtract decimals (tenths) • Derive related facts to 10,000 (e.g. 600 x 2) • Two-digit numbers divided by one-digit numbers • Add and subtract fractions (same denominators; answers bigger than 1)
• Add and subtract decimals (up to hundredths / different number of places) • Find 100%, 10%, 1% • Find 50%, 20%, 25% • Cube / cube root • Find whole from unit fraction • Multiply mixed numbers by whole numbers
• Powers of 10 more / less • Square / square root • Short multiplication • Derive related facts to 10,000 (including fractions) • Add and subtract fractions with the same denominator (answers bigger than 1)
• Add and subtract more than fourdigit numbers (84,564 + 12,323 = __ / __ = 84,564 + 12,323) • Multiply and divide by 10, 100 and 1000 • Derive related facts to 100,000 (including fractions) • Add and subtract fractions where the denominators are multiples of same number (answers bigger than 1)
• Number bonds to 10 (alternate representations) • Number bonds to 20 (alternate representations) • Addition and subtraction within 10 • Count in 2s • Double
• Three-digit numbers add tens (456 + 20 / + 30 / + 40) • Derive related facts (30 + 40 / 300 + 400 / 50 + 20) • 8 times table • Add and subtract fractions with the same denominator ( + )
• Add and subtract four-digit numbers (4564 + 2323 = __ / 5737 = __ – 1234) • Derive related facts to 10,000 (including fractions of numbers) • Three-digit times one-digit numbers • Divide a one- or two-digit number by 10 and 100
• Add and subtract decimals (up to hundredths / mix of whole and decimal) • Short division • Multiply simple fractions by whole numbers
• Decimal division • Divide mixed number by whole number
• Short division • Long division • Divide fractions by whole numbers • Mixed fractions and percentages of numbers • Fractions to decimals
Year 3 (for ages 7-8)
• Three-digit numbers subtract ones (456 – 2 / – 3 / – 4) • Partition three-digit numbers in different ways (100 + 40 + 6 / 130 + 16) • 3 and 4 times tables (including quarters)
• Add and subtract four-digit numbers (4564 + 2323 = __ / __ = 4564 + 2323) • Derive related facts to 10,000 (e.g. 600 x 2) • Three-digit times one-digit numbers • Non-unit fractions of numbers
• Add and subtract more than fourdigit numbers (84,564 + 12,323 = __ / 45,737 = __ – 31,234) • Long multiplication • Short division (no remainders) • Non-unit fractions of whole numbers • Add and subtract mixed numbers
• Decimal long multiplication • Multiply mixed pairs of fractions
• Square and cube numbers • BODMAS • Long multiplication • Multiply pairs of fractions • Find whole from fraction • Percentage of number
• Three-digit numbers add ones (456 + 2 / + 3 / + 4) • Partition two-digit numbers in different ways (80 + 2 / 70 + 12) • Mixed 2, 5 and 10 times tables (including halves and doubles)
Year 4 (for ages 8-9)
Year 5 (for ages 9-10)
Year 6 (for ages 10-11)
• Mixed decimal addition and subtraction • Derive related facts to 1,000,000 • Add and subtract fractions with different denominators • Fraction of number
• Mixed whole number addition and subtraction • Derive related facts to 100,000 • Multiply and divide by 10, 100 and 1,000 • Add and subtract fractions with denominators that are multiples of the same number
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Arithmetic Ninja 8-9 © Andrew Jennings, 2022
6
GRASSHOPPER LEVEL
WEEK 1 Monday
Tuesday
1.
20
x
9
=
1.
40
x
7
=
2.
400
x
7
=
2.
500
x
5
=
3.
100 +
+5
=
3.
300 +
+2
=
4.
27
÷
3
equals
4.
45
÷
5
equals
5.
43
x
5
=
5.
56
x
4
=
6.
of
20
=
6.
25
=
of
20
=
7.
1 5 2 5
of
7.
1 5 2 5
of
25
=
8.
3
x
32
equals
8.
4
x
29
equals
9.
9 12 15 20
add
2 12 4 20
=
9.
add
10.
3 12 1 20
=
=
3 12 4 20
10.
take away
135
Wednesday
take away
=
Thursday
1.
70
x
5
=
1.
80
x
7
=
2.
800
x
8
=
2.
600
x
8
=
3.
600 +
+2
=
3.
900 +
+1
=
4.
24
÷
3
equals
4.
36
÷
4
equals
5.
63
x
3
=
5.
74
x
4
=
6.
of
24
=
6.
21
=
of
24
=
7.
1 3 2 3
of
7.
1 6 2 6
of
21
=
8.
5
x
48
equals
8.
3
x
37
equals
9.
6 11 19 20
add
3 11 15 20
=
9.
add
10.
3 10 9 20
=
=
4 10 15 20
10.
take away
612
1.
40
x
5
=
2.
400
x
4
=
3.
400 +
+8
=
4.
64
÷
8
equals
5.
64
x
5
=
6.
of
9
=
7.
1 3 2 3
of
9
=
8.
3
x
27
equals
9.
1 10 19 20
add
1 10 1 20
=
take away
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
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take away
951
=
Ninja challenge
Friday
10.
392
498
Cho has 150 marbles. Tom says he has 67 marbles less than Cho. How many marbles does Tom have?
= 7
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v
SHINOBI LEVEL
WEEK 1 Monday 1.
564
+
Tuesday
10
=
1.
753
–
10
=
2.
753
is
10
less than
2.
564
is
10
more than
3.
554
–
10
is equal to
3.
763
+
10
=
4.
2
x
2
=
4.
3
x
2
=
5.
2
x
5
=
5.
3
x
4
=
6.
2
x
10
=
6.
3
x
10
=
7.
3x
3x
3
=
7.
2x
5x
6
is equal to
8.
4x
3x
3
is equal to
8.
2x
5x
3
=
9.
1 7
+
4 7 4 7
9.
2 8
+
3 8 4 8
=
10.
=
= +
2 7
10.
=
Wednesday
+
Thursday
1.
583
+
10
=
1.
375
is
10
2.
583
is
10
more than
less than
2.
385
+
10
=
3.
573
–
10
is equal to
3.
375
–
10
=
4.
4
x
2
=
4.
5
x
2
=
5.
4
x
5
is equal to
5.
5
x
5
=
6.
4
x
10
=
6.
5
x
10
=
7.
3x
2x
2
=
7.
2 x
5x
4
=
8.
3x
2x
4
=
8.
4x
5x
4
=
9.
5 9
+
3 9 4 9
9.
2 12
+
7 12 7 12
=
10.
=
= +
4 9
843
+
10
=
2.
843
is
10
more than
3.
833
–
10
=
4.
6
x
2
=
5.
6
x
5
=
6.
6
x
10
=
7.
3x
2x
2
=
8.
3x
3x
2
=
9.
6 11
+
3 11 4 11
=
10.
=
8
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 8
+
10.
=
+
3 12
Ninja challenge
Friday 1.
3 8
Sam says that 7 groups of 20 is equal to 140. Is Sam correct? Explain why.
6 11 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
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GRAND MASTER LEVEL
WEEK 1 Monday 1.
2,348
+
2.
972
+
3.
1,364
+
1,000
Tuesday =
1.
2,837
+
805
+
1,817
2.
=
4,471
3.
=
511
4.
1,378
–
5.
903
–
174
=
–
100
=
x
7
=
=
6
x
36
1,462
–
5.
738
–
236
=
–
100
=
x
6
=
=
4
x
24
8.
7.
9
8.
=
=
4. 6.
1,904
2,820
+
6. 7.
8
1,000
=
1,542
=
5,261
=
539 2,373
9.
45
÷
=
9
9.
32
÷
=
8
10.
90
=
÷
40
10.
5
=
÷
50
Wednesday 1.
3,057
+
2.
939
+
3.
1,362
+
100
Thursday =
1.
1,363
+
903
+
1,167
2.
=
4,810
3.
=
1,518
4.
3,271
–
5.
954
–
635
=
–
1,000
=
x
7
=
=
7
x
53
1,892
–
5.
943
–
273
=
–
1,000
=
x
8
=
=
4
x
65
8.
7.
6
8.
=
=
4. 6.
1,189
2,472
+
6. 7.
7
1,000
=
1,090
=
5,502
=
2,425 3,572
9.
54
÷
=
9
9.
36
÷
=
6
10.
12
=
÷
40
10.
6
=
÷
80
Ninja challenge
Friday 1.
2,045
+
2.
978
+
3.
+
1,837 100
= =
1,285
=
4,472
=
2,742
4.
3,384
–
5.
941
–
473
=
–
100
=
x
9
=
=
4
x
78
6. 7.
5
8.
4,294
9.
28
÷
=
4
10.
3
=
÷
60
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 9
Cho says that 1,463 is 200 more than 1,236. Is Cho correct? Explain why.
9
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 2 Monday
Tuesday
1.
345
add
100
=
1.
172
add
100
=
2.
354
take away
100
=
2.
465
take away
100
=
3.
200
=
300
less than more than
274
4.
less than more than
164
=
5.
double
9
=
6.
18
7.
3
8.
1 3 4 8 5 10
9. 10.
373
=
3.
100
263
=
4.
400
12
=
5.
double
÷
2
equals
6.
36
÷
4
equals
x
3
=
7.
4
x
4
=
8.
1 3 1 8 8 11
of
15
=
add
4 8 4 11
=
of
21
add
2 8 1 10
take away
= =
9.
=
10.
Wednesday
take away
=
Thursday
1.
467
add
300
=
1.
182
add
400
=
2.
831
take away
200
=
2.
463
take away
100
=
3.
200
503
=
3.
400
=
300
199
=
4.
200
less than more than
890
4.
less than more than
253
=
5.
double
7
=
5.
double
11
=
6.
16
÷
4
equals
6.
27
÷
3
equals
7.
8
x
8
=
7.
4
x
6
=
8.
1 4 4 8 11 12
of
20
=
8.
of
8
=
add
2 8 9 12
1 4 5 9 4 5
add
3 9 3 5
=
9. 10.
take away
=
9.
=
10.
Friday 1.
373
add
200
=
2.
184
take away
100
=
3.
400
478
=
4.
200
less than more than
17
=
5.
double
6
=
6.
24
÷
4
equals
7.
3
x
8
=
8.
1 4 1 9 2 5
of
12
=
add
1 9 1 5
=
9. 10.
take away
10
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 10
take away
=
Ninja challenge
Sam has 20 groups of 5 counters. He tells Iko that he has 120 counters. Is Sam correct? Explain why.
= Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 2 Monday 1.
857
–
10
Tuesday 1.
=
625
+
10
=
2.
857
is
10
less than
2.
625
is
10
more than
3.
867
+
10
=
3.
615
–
10
=
4.
7
x
2
=
4.
8
x
2
=
5.
7
x
5
=
5.
8
x
5
=
6.
7
x
10
is equal to
6.
8
x
10
=
7.
2x
6x
3
is equal to
7.
6x
2x
6
=
8.
1x
6x
3
=
8.
4x
2x
6
=
9.
1 10
+
8 10 4 10
9.
5 11
+
4 11 8 11
=
10.
=
= +
4 10
10.
=
Wednesday 1.
743
–
+
Thursday 1.
10
=
545
2.
545
+
10
=
is
10
more than
2.
743
is
10
less than
3.
753
+
10
=
3.
535
–
10
is equal to
4.
9
x
2
=
4.
10
x
2
=
5.
9
x
5
=
5.
10
x
5
=
6.
9
x
10
=
6.
10
x
10
=
7.
3x
4x
5
=
7.
3x
2x
12
=
8.
3x
5x
2
=
8.
6x
2x
6
=
9.
5 18
+
6 18 4 18
9.
5 15
+
9 15 9 15
=
10.
=
= +
8 18
945
–
10
=
2.
945
is
10
less than
3.
955
+
10
=
4.
11
x
2
=
5.
11
x
5
=
6.
11
x
10
=
7.
2x
3x
9
=
8.
1x
6x
8
=
9.
15 19
+
3 19 4 19
=
10.
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 11
+
10.
=
+
4 15
Ninja challenge
Friday 1.
2 11
Cho says that half of 200 is equal to double 50. Is Cho correct? Explain why.
13 19 11
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 2 Monday 1. 2.
plus 782
add
3.
1,000
more than
4.
2,305 subtract
5.
374
6. 7.
take away
2,136
256
minus 1,000 6
8.
Tuesday =
5,609
1.
=
1,186
2.
plus add
=
1,740
=
4,413
=
1,834
3.
1,000
=
1,459
4.
3,162 subtract
=
2,492
783
6. 7.
=
=
6
times
47
8.
=
3
9.
48
divided by
10.
4
=
divided by
10.
6
=
540
shared by
7
Wednesday plus
2,037
526
minus 1,000
9
21
1.
take away
groups of
9.
3,744
more than
3,374
5.
=
904
= =
1,383
= =
3,382
groups of
5
=
=
7
times
53
=
8
320
shared by
Thursday =
5,158
1.
plus
3,471
=
8,300
2.
843
add
=
1,628
2.
984
add
=
1,189
3.
1,000
more than
=
5,104
3.
1,000
more than
=
6,372
4.
4,923 subtract
=
2,549
4.
4,201 subtract
=
2,822
5.
893
6. 7.
take away
154
minus 1,000 6
8.
5.
= =
5,482
7.
=
=
9
times
48
8.
=
7
9.
45
divided by
10.
7
=
divided by
10.
5
=
250
shared by
Friday plus
3,472
=
9,295
981
add
=
1,567
3.
1,000
more than
=
7,007
4.
7,692 subtract
=
5,327
5.
754
6. 7.
take away
233
minus 1,000 5
8.
= =
=
4
times
76
=
6
divided by
10.
3
=
120
12
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 12
=
6,372
groups of
6
=
=
9
times
54
=
5
280
shared by
Ninja challenge
Iko subtracts 100 from 4,012. What is her answer?
7,362
6
36
8
=
=
groups of
9.
232
minus 1,000
7
56
2.
6.
take away
groups of
9.
1.
903
shared by
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 3 Monday
Tuesday
1.
311
plus
100
=
1.
401
plus
100
=
2.
143
subtract
100
equals
2.
362
subtract
100
equals
3.
100
478
=
3.
100
=
100
17
=
4.
100
less than more than
181
4.
less than more than
190
=
5.
4
multiplied by
2
=
5.
2
multiplied by
3
=
6.
12
shared by
4
equals
6.
15
shared by
5
equals
7.
3
times
20
=
7.
4
times
40
=
8.
1 4 1 14 2 7
8.
1 5 4 14 6 7
of
20
=
add
6 14 3 7
equals
9. 10.
of
12
add
1 14 1 7
take away
= equals
9.
=
10.
Wednesday
take away
=
Thursday
1.
26
plus
100
=
1.
98
plus
100
=
2.
107
subtract
100
equals
2.
273
subtract
100
equals
3.
100
204
=
3.
100
=
100
9
=
4.
100
less than more than
462
4.
less than more than
17
=
5.
6
multiplied by
5
=
5.
7
multiplied by
3
=
6.
25
shared by
5
equals
6.
70
shared by
10
equals
7.
5
times
30
=
7.
4
times
70
=
8.
1 5 4 13 5 7
of
30
=
8.
of
16
=
add
5 13 1 7
1 8 5 13 7 8
add
7 13 6 8
equals
9. 10.
take away
equals
9.
=
10.
Friday 1.
163
plus
100
=
2.
804
subtract
100
equals
3.
100
909
=
4.
100
less than more than
1
=
5.
8
multiplied by
2
=
6.
50
shared by
5
equals
7.
5
times
50
=
8.
1 3 1 13 6 8
of
30
=
add
5 13 4 8
equals
9. 10.
take away
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 13
take away
=
Ninja challenge
Tom starts with the number 200. He halves it, then halves it again. What number does Tom finish with?
= 13
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 3 Monday 1.
3,593
+
Tuesday
100
=
1.
2,734
–
100
=
2.
2,734
is
100
less than
2.
3,593
is
100
more than
3.
3,493
–
100
is equal to
3.
2,834
+
100
is equal to
4.
2
x
3
=
4.
3
x
3
=
5.
2
x
4
=
5.
3
x
4
=
6.
1 4
of
8
=
6.
1 4
of
12
=
=
3x
2x
2
7.
=
5x
3x
2
=
6x
2x
2
8.
=
5x
3x
3
–
4 9 7 9
–
2 12 7 12
=
7. 8. 9.
8 9
10.
=
9.
= –
5 9
7 12
10.
=
Wednesday 1.
2,485
+
–
3 12
Thursday 1.
100
=
5,486
2.
5,486
–
100
=
is
100
less than
2.
2,485
is
100
more than
3.
2,385
–
100
is equal to
3.
5,586
+
100
=
4.
4
x
3
=
4.
5
x
3
=
5.
4
x
4
=
5.
5
x
4
=
6.
1 4
6.
1 4
of
20
=
=
3x
4x
8
=
3x
4x
4
–
3 15 10 15
=
7. 8. 9.
11 12
10.
of
16
=
=
5x
2x
5
7.
=
4x
2x
5
8.
–
3 12 11 12
=
9.
= –
9 12
7,593
+
100
=
2.
7,593
is
100
3.
7,493
–
100
=
4.
6
x
3
=
5.
6
x
4
=
6.
1 4
of
24
=
7.
=
4x
3x
3
8.
=
3x
3x
3
–
3 20 11 20
=
10.
10 20
=
14
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 14
–
–
5 15
Iko shares 270 equally by 9. What answer will Iko get?
more than
9.
=
Ninja challenge
Friday 1.
10.
9 15
8 20 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 3 Monday
Tuesday
1.
plus
2,374
=
6,746
1.
plus
1,374
=
6,678
2.
add
1,110
=
2,373
2.
add
2,192
=
4,855
3.
subtract
1,262
=
2,210
3.
subtract
2,222
=
3,160
4.
take away
113
=
269
4.
take away
234
=
502
5.
=
5
times
34
5.
=
6
times
84
6.
divided by
6
=
3
6.
divided by
8
=
9
+
4 6 3 12
=
5 6 9 12
7.
+
2 6 6 12
= =
5 6 2 12
9
=
9
7. 8.
–
9.
1 4
of
10.
321
x
= =
4
=
8.
–
9.
3 4
of
10.
232
x
Wednesday
3
=
Thursday
1.
plus
1,255
=
7,732
1.
plus
3,462
=
9,979
2.
add
1,206
=
4,210
2.
add
3,402
=
8,209
3.
subtract
4,971
=
602
3.
subtract
1,101
=
5,302
4.
take away
577
=
366
4.
take away
351
=
650
5.
=
4
times
62
5.
=
5
times
74
6.
divided by
7
=
7
6.
divided by
7
=
4
7.
+
1 4 6 13
=
3 4 6 13
7.
+
9 14 4 13
= =
11 14 7 13
15
=
6
8.
–
9.
3 5
of
10.
435
x
= =
3
=
Friday 1.
plus
1,110
=
6,115
2.
add
2,374
=
6,322
3.
subtract
2,005
=
5,377
4.
take away
1,283
=
2,649
5.
=
6
times
63
6.
divided by
7
=
7
7.
+
=
8.
–
5 14 4 13
=
12 14 6 13
=
15
9.
5 7
of
10.
304
x
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 15
3
8.
–
9.
2 6
of
10.
291
x
3
=
Ninja challenge
Sam says that 7 groups of 9 is equal to 11 groups of 6. Is Sam correct? Explain why.
= 15
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 4 Monday
Tuesday
1.
362
plus
10
=
1.
854
plus
20
=
2.
374
subtract
20
equals
2.
133
subtract
30
equals
3.
200
364
=
3.
300
=
100
99
=
4.
200
less than more than
512
4.
less than more than
321
=
5.
48
add
17
=
5.
23
add
54
=
6.
163
plus
75
=
6.
203
plus
68
=
7.
85
154
7.
97
=
8.
of
18
8.
of
6
=
add
5 13 4 8
1 3 4 5 7 9
more than
184
1 3 4 13 7 8
more than
add
3 5 5 9
equals
9. 10.
take away
= = equals
9.
=
10.
Wednesday
take away
=
Thursday
1.
171
plus
20
=
1.
111
plus
30
=
2.
103
subtract
30
equals
2.
121
subtract
10
equals
3.
300
403
=
3.
100
=
200
103
=
4.
100
less than more than
199
4.
less than more than
99
=
5.
56
add
35
=
5.
73
add
19
=
6.
213
plus
98
=
6.
303
plus
103
=
7.
105
87
=
7.
78
=
8.
of
21
=
8.
of
28
=
add
2 5 5 9
1 4 2 6 5 6
more than
94
1 3 1 5 8 9
more than
add
2 6 3 6
equals
9. 10.
take away
equals
9.
=
10.
Friday 1.
713
plus
40
=
2.
384
subtract
30
equals
3.
200
253
=
4.
300
less than more than
364
=
5.
56
add
25
=
6.
273
plus
143
=
7.
103
173
=
8.
1 8 6 8 4 6
more than
of
24
=
add
3 8 3 6
equals
9. 10.
take away
16
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 16
take away
=
Ninja challenge
Iko says that if she equally shares 27 marbles into 3 groups, that she will have 8 marbles in each group. Is she correct? Explain why.
= Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 4 Monday 1.
8,583
+
Tuesday
100
=
1.
3,684
–
100
=
2.
3,684
is
100
less than
2.
8,583
is
100
more than
3.
8,483
–
100
=
3.
3,784
+
100
=
4.
7
x
3
=
4.
8
x
3
=
5.
7
x
4
=
5.
8
x
4
=
6.
1 4
of
28
=
6.
1 4
of
32
=
=
3x
2x
5
7.
=
4x
5x
4
=
4x
2x
7
8.
=
5x
5x
4
–
5 25 19 25
–
7 30 25 30
=
7. 8. 9.
19 25
10.
=
9.
= –
13 25
21 30
10.
=
Wednesday 1.
2,657
+
–
6 30
Thursday 1.
100
=
2,586
2.
2,586
–
100
=
is
100
less than
2.
2,657
is
100
more than
3.
2,557
–
100
=
3.
2,686
+
100
=
4.
9
x
3
=
4.
10
x
3
=
5.
9
x
4
=
5.
10
x
4
=
6.
1 4
6.
1 4
of
40
=
=
5x
8x
2
=
5x
4x
5
–
13 24 22 24
=
7. 8. 9.
11 17
10.
of
36
=
=
2x
3x
3
7.
=
3x
2x
4
8.
–
3 17 4 17
=
9.
= –
2 17
8,864
+
100
=
2.
8,864
is
100
3.
8,764
–
100
=
4.
11
x
3
=
5.
11
x
4
=
6.
1 4
of
44
=
7.
=
2x
3x
12
8.
=
6x
2x
5
–
19 27 29 27
=
10.
26 27
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 17
–
–
10 24
Cho says that 100 less than 904 is greater than 100 more than 705. Is Cho correct? Explain why.
more than
9.
=
Ninja challenge
Friday 1.
10.
23 24
21 27 17
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 4 Monday 1. 2. 3. 4.
4,321
add
364
more than
5.
less than
2.
=
1,011
3.
=
934
4.
54
5.
times
divided by
10
=
7. 9.
3 14 9 13 5 9
10.
half
of
+
=
–
=
8 14 5 13
of
=
10
120
1.
1,627
6
4
6,669
=
=
6. 8.
=
2,384 minus 834
Tuesday
=
1,934
add
=
2,964
504
more than
=
1,606
=
1,627
=
2,597 84
2,361 minus 824
2. 3. 4.
2,102
add
760
more than
817
5.
less than
7.
+
=
–
=
13 15 12 19
9.
of
=
20
10.
half
of
8.
3,474 1,732
3.
=
240
4.
38
5.
=
6
times
10
=
+
=
–
=
9.
7 15 15 19 5 6
of
54
=
10.
half
of
80
=
12 15 9 19
Friday
4.
4,026
add
=
5,488
462
more than
=
1,407
=
246
=
2,055 43
1,274 minus 1,208
5.
less than
=
6
times
10
=
6.
5
divided by
7.
+
=
–
=
9.
5 16 9 11 3 4
of
32
=
10.
half
of
220
=
8.
18
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 18
1.
=
7.
3.
=
divided by
2.
divided by
2.
10
7
2,054
9
1.
times
10 15 18 19 5 7
=
6. 8.
5
160
=
Thursday =
2,548 minus
=
6.
Wednesday 1.
less than
3,928
add
=
5,211
374
more than
=
1,358
=
370
=
1,098 26
1,274 minus 915
less than
=
9
times
10
=
6.
1
divided by
7.
+
=
–
=
9.
3 15 16 19 5 7
of
14
=
10.
half
of
140
=
8.
13 15 9 19
Ninja challenge
Tom has 6 groups of 254. Tom says that the total of the 6 groups is equal to 1,506. Is Tom correct? Explain why.
14 16 2 11
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 5 Monday 1.
97
2.
Tuesday
+
200
=
1.
114
317
–
200
equals
2.
3.
20
133
=
4.
20
less than more than
321
5.
56
take away
6.
273
7.
50
8.
+
200
=
384
–
200
equals
3.
20
103
=
=
4.
20
less than more than
98
=
17
equals
5.
76
take away
23
equals
minus
143
=
6.
142
minus
83
=
less than
134
=
7.
40
less than
221
=
3
times
4
=
8.
4
times
6
=
9.
5
multiplied by
3
equals
9.
5
multiplied by
9
equals
10.
7
groups of
5
=
10.
3
groups of
12
=
Wednesday
Thursday
1.
164
+
200
=
1.
152
+
200
=
2.
564
–
200
equals
2.
391
–
200
equals
3.
20
201
=
3.
20
=
20
112
=
4.
20
less than more than
317
4.
less than more than
197
=
5.
67
take away
43
equals
5.
84
take away
57
equals
6.
232
minus
61
=
6.
172
minus
81
=
7.
30
less than
121
=
7.
40
less than
101
=
8.
4
times
7
=
8.
4
times
9
=
9.
5
multiplied by
8
equals
9.
5
multiplied by
7
equals
10.
3
groups of
9
=
10.
3
groups of
7
=
Friday 1.
454
2.
+
200
=
412
–
200
equals
3.
20
402
=
4.
20
less than more than
31
=
5.
97
take away
43
equals
6.
236
minus
76
=
7.
30
less than
242
=
8.
4
times
5
=
9.
5
multiplied by
9
equals
10.
3
groups of
8
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 19
Ninja challenge
Cho doubles 15. She takes the answer and doubles it again. What number does Cho have?
19
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 5 Monday
Tuesday
1.
8,358
+
100
=
1.
5,445
–
100
=
2.
8,458
–
10
=
2.
5,545
+
10
=
3.
8,348
=
8,448
–
3.
5,645
=
5,745
–
4.
3
x
5
=
4.
6
x
3
=
5.
20
÷
5
=
5.
18
÷
3
=
6.
1 5
of
25
=
6.
1 3
of
18
=
7.
3x
x2
=
24
7.
4x
x3
=
36
8.
4x
x5
=
40
8.
3x
x6
=
36
9.
10 20 11 20
3 20 3 20
=
9. 10.
13 25 3 25
=
=
10 25 17 25
10.
+ –
Wednesday
+ –
=
Thursday
1.
4,543
+
100
=
1.
6,784
–
100
=
2.
4,543
–
10
=
2.
6,784
+
10
=
3.
4,433
=
4,533
–
3.
6,894
=
6,794
+
4.
7
x
3
=
4.
8
x
3
=
5.
21
÷
3
=
5.
24
÷
3
=
6.
1 3
6.
1 3
of
24
=
7.
of
21
=
3x
x4
=
60
7.
7x
x2
=
28
8.
3x
x4
=
48
8.
3x
x3
=
18
9.
16 32 27 32
13 32 8 32
=
9. 10.
7 22 8 22
=
=
14 22 16 22
10.
+ –
1.
8,583
+
100
=
2.
8,583
–
10
=
3.
8,473
=
8,573
–
4.
9
x
3
=
5.
27
÷
3
=
6.
1 3
of
27
=
7.
4x
x6
=
48
8.
3x
x7
=
63
9.
13 27 19 27
8 27 11 27
=
10.
–
20
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 20
–
=
Ninja challenge
Friday
+
+
Sam counts on 4 lots of 100 from 1,775. What number does Sam count on to?
= Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 5 Monday 1.
5,765
+
2.
1,263
more than
3.
3,036
–
Tuesday =
1,354
8,407
=
1.
5,374
+
2.
1,563
more than
3,462
–
=
672
3.
= 2,421
9,266
= =
1,680
4.
divided by
6
=
8
4.
divided by
6
=
6
5.
=
4
x
78
5.
=
5
x
83
=
10
times
=
10
times
+
7 16
+
11 16
=
6.
5
7. 9.
4 12 3 4
10.
double
8.
=
7
7.
40
=
9.
11 12 3 5
70
=
10.
double
–
=
of
6. 14 16 1 12
8.
Wednesday 1.
5,271
+
2.
1,362
more than
3.
4,377
–
of
= 50
=
50
=
Thursday =
2,562
–
12 16 2 12
8,643
=
1.
3,474
+
2.
1,263
more than
5,302
–
=
3,340
3.
= 3,488
5,848
= =
4,398
4.
divided by
5
=
9
4.
divided by
6
=
7
5.
=
4
x
93
5.
=
5
x
67
=
10
times
=
10
times
+
1 15
=
+
5 15
=
6.
6
7. 9.
21 22 4 5
10.
double
8.
12 15 12 22
6,372
+
2.
1,804
more than
3.
5,932
–
=
9.
90
=
10.
double
= 4,029
8,234
= =
4,782
4.
divided by
9
=
4
5.
=
7
x
34
=
10
times
+
5 15
=
6.
3
7. 9.
17 22 4 5
10.
double
8.
– of
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 21
7.
35
=
Friday 1.
2 17 22 4 9
– of
6.
= 25
=
80
=
8.
– of
= 36
=
120
=
13 15 9 22
Ninja challenge
Tom says that 3,407 is 1,000 less than 2,407 Is Tom correct? Explain why.
10 15 10 22
21
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 6 Monday 1.
153
2.
Tuesday
+
200
=
1.
341
521
–
300
equals
2.
3.
300
532
=
4.
400
less than more than
142
5.
84
add
6.
136
7.
+
500
=
731
–
400
equals
3.
500
769
=
=
4.
300
less than more than
274
=
54
equals
5.
86
add
68
equals
minus
121
=
6.
143
minus
101
=
4
times
7
=
7.
4
times
4
=
8.
8
multiplied by
7
equals
8.
8
multiplied by
5
equals
9.
40
x
3
=
9.
30
x
5
=
10.
50
x
5
=
10.
80
x
3
=
Wednesday
Thursday
1.
283
+
400
=
1.
184
+
800
=
2.
827
–
600
equals
2.
871
–
500
equals
3.
600
913
=
3.
700
=
500
185
=
4.
400
less than more than
824
4.
less than more than
495
=
5.
75
add
59
equals
5.
98
add
25
equals
6.
241
minus
127
=
6.
253
minus
162
=
7.
4
times
5
=
7.
4
times
3
=
8.
8
multiplied by
9
equals
8.
8
multiplied by
3
equals
9.
50
x
9
=
9.
30
x
8
=
10.
60
x
5
=
10.
70
x
3
=
Friday 1.
284
2.
+
500
=
365
–
100
equals
3.
600
869
=
4.
300
less than more than
217
=
5.
79
add
65
equals
6.
284
minus
94
=
7.
4
times
7
=
8.
8
multiplied by
6
equals
9.
90
x
5
=
10.
80
x
8
=
22
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 22
Ninja challenge
Sam says that 123 more than 242 is 365. Is Sam correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 6 Monday
Tuesday
1.
3,596
+
100
=
1.
6,483
–
100
=
2.
3,596
–
10
=
2.
6,483
+
10
=
3.
3,486
=
3,586
–
3.
6,593
=
6,493
+
4.
8
x
4
=
4.
9
x
4
=
5.
8
x
8
=
5.
9
x
8
=
6.
1 5
of
of
7.
3x
8. 9.
=
8
6.
1 5
x2
=
30
7.
2x
9x
x5
=
90
8.
23 26
7 26 16 26
9.
10.
– =
= –
9 26
=
9
x3
=
24
3x
x2
=
18
23 36
7 36 16 36
=
10.
– =
Wednesday
–
Thursday
1.
2,343
+
100
=
1.
6,734
–
100
=
2.
2,343
–
10
=
2.
6,734
+
10
=
3.
2,233
=
2,333
–
3.
6,844
=
6,744
+
4.
10
x
4
=
4.
11
x
4
=
5.
10
x
8
=
5.
11
x
8
=
6.
1 5
of
7.
4x
8. 9.
=
10
6.
1 5
x5
=
40
7.
5x
3x
x4
=
24
8.
38 42
9 42 35 42
9.
10.
of
– =
= –
8 42
1.
7,564
+
100
=
2.
7,564
–
10
=
3.
7,454
=
7,554
–
4.
12
x
4
=
5.
12
x
8
=
6.
1 5
of
7.
3x
8.
4x
9.
35 40
10.
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 23
11
x2
=
30
4x
x2
=
40
36 40
9 40 38 40
=
– =
–
8 40
Sam says that 7 groups of 8 is equal to 64. Is Sam correct? Explain why.
=
12
x2
=
60
x5
=
60
18 40 33 40
= –
10.
=
Ninja challenge
Friday
–
9 36
19 40 23
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 6 Monday 1.
835
+
2.
1,363
+
3.
3,475
+
Tuesday =
800
1,735
equals
1.
983
+
2.
2,364
+
1,279
+
=
4,075
3.
= 900
1,483
equals =
1,979
4.
divided by
9
is equal to
40
4.
divided by
6
is equal to
30
5.
=
5
x
23
5.
=
7
x
45
6.
=
10
times
0.5
6.
=
10
times
0.4
=
plus
10 15
=
plus
5 15
–
8.
=
9.
3 22 4 5
4 15 10 22
of
30
=
10.
quarter
of
16
=
7. 8.
=
9.
12 22 4 6
4 15 19 22
of
24
=
10.
quarter
of
12
=
7.
Wednesday 1.
848
+
2.
1,037
+
3.
3,475
+
Thursday =
400
–
1,448
equals
1.
827
+
2.
1,454
+
2,947
+
=
4,275
3.
= 300
1,727
equals =
3,547
4.
divided by
4
is equal to
70
4.
divided by
5
is equal to
50
5.
=
9
x
73
5.
=
6
x
66
6.
=
10
times
0.8
6.
=
10
times
0.9
7.
=
plus
3 15
7.
=
plus
6 15
–
8.
=
9.
17 18 5 6
10 15 10 18
of
60
=
10.
quarter
of
40
=
8.
Friday 1.
903
+
2.
1,706
+
3.
2,093
+
= 600
1,203
equals =
2,993
4.
divided by
4
is equal to
70
5.
=
4
x
87
6.
=
10
times
0.1
=
plus
6 15
=
9.
7 19 3 5
5 15 13 19
of
45
=
10.
quarter
of
28
=
7. 8.
24
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 24
=
9.
8 19 5 7
6 15 15 19
of
35
=
10.
quarter
of
20
=
–
Ninja challenge
Cho divides 480 into equal groups of 6. How many equal groups of 6 will Cho have?
–
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 7 Monday 1.
173
2.
Tuesday
+
53
=
1.
187
194
–
75
equals
2.
3.
200
274
=
4.
200
less than more than
384
5.
174
plus
6.
273
7.
+
67
=
184
–
93
equals
3.
300
538
=
=
4.
300
less than more than
174
=
103
equals
5.
252
plus
127
equals
subtract
132
=
6.
352
subtract
142
=
36
divided by
4
=
7.
27
divided by
3
=
8.
15
shared by
5
equals
8.
14
shared by
2
equals
9.
150
÷
5
=
9.
240
÷
8
=
10.
120
÷
4
=
10.
160
÷
4
=
Wednesday
Thursday
1.
195
+
86
=
1.
203
+
98
=
2.
274
–
81
equals
2.
304
–
45
equals
3.
400
512
=
3.
500
=
400
83
=
4.
500
less than more than
863
4.
less than more than
184
=
5.
121
plus
102
equals
5.
173
plus
135
equals
6.
231
subtract
132
=
6.
325
subtract
105
=
7.
25
divided by
5
=
7.
32
divided by
4
=
8.
21
shared by
3
equals
8.
18
shared by
2
equals
9.
350
÷
5
=
9.
720
÷
8
=
10.
200
÷
5
=
10.
300
÷
5
=
Friday 1.
257
2.
+
64
=
278
–
83
equals
3.
600
724
=
4.
600
less than more than
286
=
5.
149
plus
127
equals
6.
294
subtract
245
=
7.
24
divided by
2
=
8.
96
shared by
8
equals
9.
120
÷
4
=
10.
350
÷
5
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 25
Ninja challenge
Tom has 137 less marbles than Iko. Iko has 256 marbles. How many marbles does Tom have?
25
15/09/2022 09:51
SHINOBI LEVEL
WEEK 7 Monday
Tuesday
1.
6,707
–
10
=
1.
2,397
+
10
=
2.
9,307
–
10
=
2.
5,497
+
10
is equal to
=
2,007
–
3.
=
1,997
+
3.
10
4.
3,000 + 400 +
23
=
4.
2,000 + 500 + 60 + 2
=
5.
8,000 + 200 +
42
=
5.
9,000 + 700 +
39
=
6.
6
x
2
=
6.
3
x
5
=
7.
600
x
2
=
7.
30
x
5
=
8.
60
x
20
=
8.
3
x
500
=
9.
1 4 1 5
1 3 1 6
of
24
=
of
42
=
10.
of
24
=
9.
of
25
=
10.
Wednesday
Thursday
1.
5,207
–
10
=
1.
1,497
+
10
=
2.
4,307
–
10
=
2.
3,497
+
10
=
3.
=
6,007
–
3.
=
4,997
+
4.
8,000 + 300 + 90 + 8
=
4.
5,000 + 400 + 30 + 7
=
5.
7,000 + 500 +
13
=
5.
2,000 + 900 + 40 + 1
=
10
6.
4
x
6
=
6.
3
x
7
=
7.
4
x
60
=
7.
30
x
7
=
8.
40
x
60
=
8.
3
x
700
=
9.
1 8 1 5
1 10 1 9
of
60
=
of
72
=
10.
of
24
=
9.
of
60
=
10.
1.
8,609
–
10
=
2.
5,609
–
10
=
3.
=
8,009
–
4.
6,000 + 200 + 30 + 6
=
5.
9,000 + 100 + 60 + 3
=
6.
6
x
3
=
7.
60
x
3
=
8.
6
x
300
=
9.
1 11 1 4
of
77
=
of
48
=
26
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 26
10
Ninja challenge
Friday
10.
10
Tom says that 10 less than 6,002 is equal to 5,902. Is Tom correct? Explain why. 10
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 7 Monday 1.
903
–
2.
1,706
–
300
Tuesday = equals 1,106
1.
834
–
2.
2,371
–
400
= equals 1,871
3.
–
900
=
1,193
3.
–
800
=
403
4.
times
2
is equal to
1,200
4.
times
5
is equal to
1,500
5.
=
6
x
87
5.
=
7
x
45
=
321
times
5
6.
=
315
times
4
plus
6 14 2 12
7.
plus –
4 14 7 12
24
=
8
6. 7.
7 14
8.
= 11 12
=
9.
4 5
of
10.
third
of
– =
15
=
8 14
8.
=
9.
1 5
of
10.
third
of
Wednesday 1.
923
–
2.
1,294
–
300
= 9 12
30
=
Thursday =
1.
981
–
1,274
–
equals
594
2.
400
= equals
974
3.
–
500
=
1,539
3.
–
900
=
1,572
4.
times
5
is equal to
2,500
4.
times
3
is equal to
2,700
5.
=
9
x
46
5.
=
6
x
52
6.
=
416
times
4
6.
=
423
times
5
plus
6 14 7 12
7.
plus –
3 14 7 12
40
=
8
7.
11 14
8.
= 10 12
=
9.
4 5
of
10.
third
of
– =
9
=
748
–
2.
1,742
–
200
= equals
942
3.
–
300
=
1,604
4.
times
6
is equal to
3,600
5.
=
5
x
67
=
352
times
4
plus –
1 14 3 12
=
24
6. 7.
3 14
8.
= =
9.
6 7
of
10.
third
of
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 27
5 12
27
8.
= =
9.
4 7
of
10.
third
of
9 12
33
=
Ninja challenge
Friday 1.
6 14
If Iko counts on 2,000 from 406, what will her answer be?
= 27
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 8 Monday 1.
276
2.
Tuesday
+
164
=
1.
173
241
–
183
equals
2.
3.
80
4.
80
less than more than
5.
double
6.
half
7.
+
129
=
283
–
125
equals
less than more than
273
=
211
=
100
equals
374
=
3.
90
163
=
4.
90
40
equals
5.
double
of
10
=
6.
half
of
60
=
24
divided by
3
=
7.
32
divided by
4
=
8.
16
shared by
2
equals
8.
33
shared by
3
equals
9.
3x
10
x2
=
9.
4x
5
x2
=
10.
2x
5
x6
=
10.
3x
3
x5
=
Wednesday
Thursday
1.
193
+
142
=
1.
204
+
193
=
2.
273
–
231
equals
2.
384
–
285
equals
3.
70
163
=
3.
60
=
70
189
=
4.
60
less than more than
123
4.
less than more than
78
=
5.
double
80
equals
5.
double
90
equals
6.
half
of
120
=
6.
half
of
44
=
7.
27
divided by
3
=
7.
15
divided by
3
=
8.
45
shared by
5
equals
8.
9
shared by
3
equals
9.
5x
5
x2
=
9.
4x
5
x4
=
10.
8x
2
x2
=
10.
5x
6
x4
=
Friday 1.
256
2.
+
165
=
205
–
178
equals
3.
90
174
=
4.
90
less than more than
183
=
5.
double
120
equals
6.
half
of
50
=
7.
20
divided by
4
=
8.
40
shared by
8
equals
9.
3x
5
x2
=
10.
8x
5
x2
=
28
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 28
Ninja challenge
Sam says 76 is 120 less than 187. Is Sam correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 8 Monday
Tuesday
1.
7,697
+
10
=
1.
7,809
–
10
=
2.
3,697
+
10
=
2.
4,309
–
10
=
3.
=
4,997
+
3.
=
6,009
–
4.
5,000 + 600 + 90 + 4
=
4.
7,000 + 900 + 30 + 2
=
5.
3,000 + 500 + 80 + 3
=
5.
5,000 + 70 +
9
=
10
6.
8
x
2
=
6.
3
x
9
=
7.
8
x
20
=
7.
30
x
9
=
8.
800
x
2
=
8.
300
x
9
=
9.
1 6 1 7
1 4 1 5
of
36
=
of
55
=
10.
of
42
=
9.
of
56
=
10.
Wednesday
Thursday
1.
7,496
+
10
=
1.
8,507
–
10
=
2.
3,596
+
10
=
2.
3,807
–
10
=
=
7,996
+
=
4,007
–
3.
10
3.
4.
3,000 + 500 +
70
=
4.
2,000 + 400 +
5
=
5.
5,000 + 200 +
9
=
5.
6,000 + 70 +
6
=
6.
3
x
3
=
6.
4
x
2
=
7.
30
x
3
=
7.
40
x
2
=
8.
30
x
30
=
8.
400
x
2
=
9.
1 6 1 9
1 4 1 5
of
44
=
of
45
=
10.
of
24
=
9.
of
54
=
10.
1.
5,798
+
10
=
2.
6,598
+
10
=
3.
=
5,998
+
4.
5,000 + 300 + 20 + 6
=
5.
7,000 + 400 +
68
=
6.
9
x
2
=
7.
90
x
2
=
8.
90
x
20
=
9.
1 3 1 6
of
36
=
of
54
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 29
10
Ninja challenge
Friday
10.
10
Iko says that one quarter of 400 is equal to 50 x 2. Is Iko correct? Explain why. 10
29
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 8 Monday 938
340
more than less than
3.
4x
7
x2
4.
700
times
1.
837
2.
5. 6.
944
=
983
732
more than less than
3.
6x
3
x5
900
times
1.
822
2.
is equal to
4,200
4.
=
6
x
83
5.
=
174
times
5
6.
=
7 14 9 12
9.
of
10.
40
divided by
1.
762
977
2.
984
more than less than
3.
9x
5
x3
4.
500
times
8.
= equals
10 14 6 12 2 7
7.
Tuesday
=
10
6
=
5,400 62
=
125
times
4
=
5 14 6 12
plus
60
divided by
1.
879
902
2.
658
more than less than
3.
7x
6
x7
200
times
Wednesday
is equal to
x
10.
8.
=
8
of
–
635
=
9.
7.
=
equals
8 14 3 12 2 9
plus
=
=
– =
10
6
=
Thursday = equals
588
= is equal to
4,000
4.
= equals 1,597 = is equal to
1,600
5.
=
6
x
88
5.
=
4
x
93
6.
=
364
times
5
6.
=
246
times
6
=
5 15 8 12
plus
7.
=
plus
–
8.
5 15 8 12
9.
14 15 5 12 6 9
of
10.
90
divided by
1.
620
940
2.
395
more than less than
3.
5x
8
x6
4.
700
times
7. 8.
=
= 10
36
=
5. 6.
= is equal to
2,800
x
84
=
273
times
7
=
8 13 9 17
plus
of
10.
50
divided by
8.
846
6
9.
7.
=
= 12 13 5 17 5 6
=
30
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 30
10.
10
divided by
– =
10
36
=
Cho adds an unknown number to 309 and gets an answer of 1,576. What is Cho’s unknown number?
– =
10
of
=
Ninja challenge
Friday equals
9.
9 15 4 12 6 7
30
= Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 9 Monday 1. 2.
1 4 1 4
Tuesday
+
2 4
=
1.
of
24
equals
2.
1 4 1 3
+
1 4
=
of
15
equals
573
=
500
less than more than
152
=
3.
300
4.
400
less than more than
5.
23
x
2
equals
5.
35
x
4
equals
6.
34
x
3
=
6.
21
x
6
=
7.
35
divided by
5
=
7.
36
divided by
3
=
8.
12
shared by
3
equals
8.
18
shared by
2
equals
9.
2x
5
x8
=
9.
4x
5
x3
=
10.
3x
10
x3
=
10.
10 x
2
x5
=
1. 2.
3 5 1 8
3.
300
4.
857
=
3.
200
364
=
4.
Wednesday
Thursday
+
1 5
=
1.
of
32
equals
2.
937
=
3.
300
400
less than more than
3 12 1 5
+
7 12
=
of
45
equals
456
=
400
less than more than
541
=
4.
151
=
5.
41
x
6
equals
5.
29
x
4
equals
6.
34
x
5
=
6.
26
x
3
=
7.
45
divided by
5
=
7.
55
divided by
5
=
8.
16
shared by
8
equals
8.
27
shared by
3
equals
9.
8x
5
x3
=
9.
2x
3
x4
=
10.
10 x
2
x 10
=
10.
5x
4
x6
=
Friday 1. 2.
2 12 1 3
+
9 12
=
of
27
equals
963
=
127
=
3.
900
4.
800
less than more than
5.
36
x
3
equals
6.
24
x
5
=
7.
28
divided by
4
=
8.
18
shared by
3
equals
9.
7x
2
x2
=
10.
2x
6
x3
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 31
Ninja challenge
Iko doubles 36. Tom halves 140. Who has more?
31
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 9 Monday 1.
4,994
2.
Tuesday 1.
5,096
+
100
=
=
3,968
+
100
2.
+
100
3.
=
5,634
4.
=
7,589
5.
3,000 +
–
100
=
=
6,025
–
100
+
100
+7
=
8,657
+ 30 + 8
=
3,538
3.
7,068
4.
5,000 +
5.
7,000 +
500 + 80 +
6.
3
x
8
=
6.
7
x
6
=
7.
30
x
8
=
7.
7
x
60
=
8.
3
x
800
=
8.
70
x
60
=
9.
1 8 1 5
of
32
=
9.
of
36
=
of
35
=
10.
1 9 1 4
of
48
=
10.
= + 30 + 4
9,012
+ 600 + 50
Wednesday 1.
7,953
2.
=
Thursday 1.
+
100
=
=
3,901
+
100
2.
3,098
–
100
=
–
100
=
7,914
–
100
+8
=
3,408
+ 40 + 3
=
6,543
3.
2,004
=
+
100
3.
4.
1,000 +
900 + 50 +
=
1,953
4.
5.
2,000 +
+ 40 + 5
=
2,845
5.
6,000 +
6.
4
x
9
=
6.
6
x
5
=
7.
40
x
9
=
7.
6
x
50
=
8.
4
x
900
=
8.
60
x
30
=
9.
1 11 1 6
1 9 1 7
of
36
=
of
84
=
10.
of
33
=
9.
of
36
=
10.
5,983
+
2.
6,056
=
3.
=
100
= +
100
6,998
+
100
+ 40 + 9
=
6,749
=
8,639
4.
6,000 +
5.
8,000 +
600 + 30 +
6.
3
x
11
=
7.
30
x
11
=
8.
3
x
110
=
9.
1 8 1 3
of
48
=
of
36
=
10. 32
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 32
= + 400
Ninja challenge
Friday 1.
8,967
Tom says that the difference between 847 and 300 is 547. Is Tom correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 9 Monday 1.
6,000 +
2.
5,000 +
600 + 30 +
3.
5x
9
4.
600
times
5.
558
=
6.
1,629
=
7.
+ 40 + 9
x5
=
6,949
1.
4,000 +
=
5,633
2.
8,000 +
700 + 20 +
3.
7x
4
4.
500
times
5.
536
=
6.
1,456
=
= is equal to
6
=
8.
Tuesday
=
2,400
x times
3
4 12 9 21
plus
4 12 4 21
–
9.
5 8
of
48
=
10.
50
x
50
=
7,000 +
2.
4,000 +
200 + 20 +
3.
6x
6
4.
300
times
5.
336
=
6.
1,099
=
7.
+ 10 + 2
x7
=
8.
=
=
7x
5
4.
700
times
5.
609
=
6.
1,408
=
2,400
x
1 12 17 21
plus
3 12 14 21
–
70
=
Friday
4.
400
times
5.
666
=
6.
561
=
=
6,573
=
9,445
7.
=
8.
=
16 17 22 25
x9
=
5,922
=
8,315
= is equal to
7
x times
4
plus
3 15 15 24
=
9.
3 4
9 15 22 24
of
36
=
10.
60
x
70
=
7.
=
8.
5,600
–
Ninja challenge
Cho multiplies the product of 6 times 7 by 4. What answer does Cho have?
2,400
times
3
subtract
12 17 5 25
–
6 7
of
28
=
10.
30
x
70
=
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 33
+ 20 + 2
x
9.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
–
= is equal to
9
6 12 14 21
90
3.
=
7
x3
plus
x
300 + 10 +
x
8
4
20
8,000 +
50
6x
times
10.
2.
10.
3.
4,500
x
=
4,226
=
9,000 +
8
24
=
27
2.
is equal to
of
5,000 +
of
400 + 40 +
=
9.
8.
1.
times
+ 70 + 3
8,726
=
=
7,512
9.
6,000 +
=
6 8
7.
=
2 3
1.
4,417
Thursday
is equal to
6
x6
=
3 12 20 21
Wednesday 1.
+ 10 + 7
33
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 10 Monday
Tuesday
4.
2 8 1 3 2 6 2 3
5.
5
x
17
equals
5.
4
x
18
equals
6.
3
x
19
=
6.
5
x
23
=
7.
14
divided by
2
=
7.
18
divided by
3
=
8.
21
shared by
3
equals
8.
30
shared by
5
equals
9.
100 +
70
+4
=
9.
100 +
90
+6
=
10.
100 + 30 +
2
=
100 + 20 +
10.
100 + 40 +
9
=
100 + 20 +
1.
4.
4 8 1 5 3 6 3 4
5.
1. 2. 3.
+
5 8
=
1.
of
21
equals
2.
+
3 6
=
3.
of
15
equals
4.
3 8 1 3 1 6 3 4
Wednesday +
=
1.
of
15
equals
2.
+
2 6
=
3.
of
40
equals
4.
1 9 1 4 3 17 3 5
5
x
19
equals
5.
6.
4
x
28
=
7.
50
divided by
10
8.
36
shared by
9.
200 +
10.
200 + 30 +
3.
12
equals
+
3 6
=
of
16
equals
=
of
36
equals
+
10 17
=
of
25
equals
3
x
46
equals
6.
8
x
23
=
=
7.
72
divided by
8
=
3
equals
8.
48
shared by
4
equals
30
+4
=
9.
200 +
70
+6
=
1
=
200 + 20 +
10.
200 + 40 +
5
=
200 + 20 +
4. 5.
3
x
23
equals
6.
3
x
42
=
7.
15
divided by
3
=
8.
45
shared by
5
equals
9.
300 +
90
+2
=
10.
300 + 60 +
9
=
300 + 30 +
3.
of
7 9
5 9 1 5 6 17 2 3
2.
=
+
Friday 1.
3 8
Thursday
3 8
2.
+
+
2 9
=
of
45
equals
+
9 17
=
of
27
equals
34
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 34
Ninja challenge
Tom starts at the number 114. He starts counting on in hundreds. He counts on 5 lots of 100. What number does Tom reach?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 10 Monday 1.
9,054
2.
Tuesday 1.
–
100
=
–
100
=
6,999
2.
8,943
+
100
=
+
100
=
8,015
+
100
=
9,754
=
8,690
3.
7,932
=
–
100
3.
4.
7,000 +
400 + 70 +
=
7,473
4.
+ 700
5.
9,000 +
+5
=
9,605
5.
8,000 + 600 +
6.
5
x
9
=
6.
6
x
12
=
7.
5
x
90
=
7.
60
x
12
=
8.
50
x
90
=
8.
600
x
12
=
9.
1 3 1 5
1 9 1 4
of
18
=
of
36
=
10.
of
24
=
9.
of
35
=
10.
6,043
Wednesday 1.
9,034
2. 3.
3,989
4.
9,000 +
5.
+ 50 + 4
Thursday 1.
2,967
–
100
=
–
100
=
6,985
2.
–
100
3.
+ 80 + 3
=
9,783
4.
+ 800
+ 60 + 8
=
7,868
5.
4,000 +
=
=
5,099
+
100
=
+
100
=
7,045
+
100
+ 300 + 70 + 8
=
5,378
+ 60 + 1
=
4,861
=
6.
3
x
12
=
6.
9
x
4
=
7.
3
x
120
=
7.
90
x
4
=
8.
3
x
1,200
=
8.
9
x
40
=
9.
1 3 1 6
1 2 1 3
of
6
=
of
6
=
10.
of
18
=
9.
of
18
=
10.
Ninja challenge
Friday 1.
7,055
2.
–
100
=
–
100
=
7,967
3.
3,903
=
–
100
4.
8,000 +
600 + 70 +
=
8,679
5.
9,000 +
+ 80 + 3
=
9,783
6.
4
x
12
=
7.
40
x
12
=
8.
4
x
120
=
9.
1 11 1 7
of
77
=
of
77
=
10.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 35
Cho says that 4 groups of 90 is equal to 360. Is Cho correct? Explain why.
35
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 10 Monday 1.
5,000 +
2.
6,000 +
300 + 50 +
3.
6x
8
4.
900
times
5.
448
=
6.
1,448
=
7.
+ 50 + 4
x6
8.
=
=
5,354
1.
3,000 +
=
6,357
2.
4,000 +
600 + 30 +
3.
9x
9
4.
700
times
5.
423
=
6.
1,689
=
= is equal to
8
=
Tuesday
2,700
x times
4
5 17 21 25
plus
9 17 5 25
–
9.
2 9
of
36
=
10.
40
x
80
=
5,000 +
2.
7,000 +
700 + 70 +
3.
11 x
4
4.
600
times
5.
468
=
6.
2,496
=
7.
+ 60 + 9
x5
=
8.
=
80
x
90
=
800 + 60 +
3.
7x
8
4.
900
times
5.
522
=
6.
4,170
=
= 4,200
x 4
7 17 23 25
plus
8 17 15 25
–
x
60
=
Friday
12
4.
800
times
5.
470
=
6.
2,355
=
x5
=
9,747
=
5,613
7.
=
8.
=
11 18 19 21
x4
=
6,571
=
6,862
= is equal to
6
x times
5
plus
2 18 18 25
=
9.
5 6
14 18 23 25
of
24
=
10.
90
x
50
=
7.
=
8.
6,300
–
Ninja challenge
Tom has an answer of 2,700. If Tom has 3 equal groups, what is each equal group made up of?
5,600
times
3
plus
6 18 18 21
–
5 7
of
42
=
10.
60
x
70
=
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 36
+ 70 + 1
x
9.
36
–
= is equal to
5
9 17 5 25
10.
6,000 +
70
6x
plus =
2.
10.
3.
3
54
7,771
=
5,000 +
times
of
=
36
2.
4,900
x
9.
8.
6,000 +
of
600 + 10 +
=
=
=
1.
times
+ 40 + 7
4,639
4 6
7.
5,969
9.
9,000 +
= is equal to
9
=
3 6
1.
3,746
Thursday
is equal to
6
x4
=
1 17 20 25
Wednesday 1.
+ 40 + 6
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 11 Monday
Tuesday
4.
8 9 1 4 16 17 2 3
5.
4
x
32
equals
5.
5
x
31
equals
6.
5
times
7
=
6.
3
times
12
=
7.
20
divided by
4
=
7.
25
divided by
5
=
8.
27
shared by
3
equals
8.
18
shared by
3
equals
9.
400 +
20
+4
=
9.
500 +
30
+7
=
10.
300 + 70 +
2
=
300 + 50 +
10.
400 + 80 +
3
=
400 + 50 +
1.
4.
9 12 1 8 11 13 2 3
5.
1. 2. 3.
–
2 9
=
1.
of
20
equals
2.
–
9 17
=
3.
of
12
equals
4.
8 10 1 5 10 12 2 3
Wednesday –
=
1.
of
24
equals
2.
–
7 13
=
3.
of
30
equals
4.
18 19 1 4 9 13 2 3
8
x
23
equals
5.
6.
9
times
4
=
7.
28
divided by
4
8.
40
shared by
9.
400 +
10.
500 + 30 +
3.
30
equals
–
3 12
=
of
9
equals
=
of
16
equals
–
4 13
=
of
15
equals
4
x
46
equals
6.
3
times
6
=
=
7.
20
divided by
5
=
4
equals
8.
40
shared by
5
equals
20
+6
=
9.
300 +
90
+2
=
3
=
500 + 10 +
10.
600 + 40 +
5
=
600 + 30 +
4. 5.
5
x
56
equals
6.
3
times
8
=
7.
18
divided by
3
=
8.
25
shared by
5
equals
9.
400 +
60
+8
=
10.
600 + 50 +
6
=
600 + 40 +
3.
of
9 19
14 19 1 4 10 13 2 8
2.
=
–
Friday 1.
2 10
Thursday
4 12
2.
–
–
6 19
=
of
24
equals
–
4 13
=
of
16
equals
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 37
Ninja challenge
Cho says that 40 shared by 5 is equal to 24 shared by 3. Is Cho correct? Explain why.
37
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 11 Monday
Tuesday
1.
3,596
+
10
=
1.
5,964
–
10
is equal to
2.
3,596
–
100
=
2.
5,964
+
100
=
3.
3,596
+
1,000
=
3.
5,964
–
1,000
=
4.
4,060
+
504
is equal to
4.
4,500
+
89
=
5.
7,006
+
540
=
5.
8,002
+
340
is equal to
6.
12
÷
2
=
6.
8
÷
4
=
7.
120
÷
2
=
7.
80
÷
4
=
8.
1,200
÷
2
=
8.
800
÷
4
=
9.
1 9 1 8
1 11 1 2
of
22
is equal to
of
22
=
10.
of
72
is equal to
9.
of
72
=
10.
Wednesday
Thursday
1.
7,684
+
10
=
1.
8,503
–
10
=
2.
7,684
–
100
=
2.
8,503
+
100
=
3.
7,684
+
1,000
=
3.
8,503
–
1,000
=
4.
6,090
+
804
=
4.
7,004
+
600
=
5.
8,003
+
560
=
5.
3,040
+
809
=
6.
16
÷
2
=
6.
18
÷
3
=
7.
160
÷
2
=
7.
180
÷
3
=
8.
1,600
÷
2
=
8.
1,800
÷
3
=
9.
1 4 1 9
1 12 1 6
of
72
is equal to
of
72
=
10.
of
36
is equal to
9.
of
36
=
10.
Friday 1.
6,943
+
10
=
2.
6,943
–
100
=
3.
6,943
+
1,000
=
4.
4,090
+
603
=
5.
6,004
+
80
=
6.
24
÷
3
=
7.
240
÷
3
=
8.
2,400
÷
3
=
9.
1 3 1 8
of
24
is equal to
of
24
=
10. 38
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 38
Ninja challenge
Sam says that the difference between 4,572 and 1,000 is 3,572. Is Sam correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 11 Monday 1.
834
=
2.
1,742
=
3.
40
x
4.
6,400
=
5.
240
=
6.
600
=
7.
60
Tuesday 2,369
1.
minus 1,127
2.
1,111
=
3.
50
x
4.
4,200
=
5.
270
=
300
=
plus = lots of
4
÷
4
8.
=
9.
=
10.
=
1 15 13 14 5 7
80
x shared by
6
6.
=
80
7.
plus –
6 15 10 14
of
42
=
819
=
2.
1,666
=
3.
60
x
4.
2,700
=
5.
180
=
6.
500
=
60
2,364
minus 1,263 90
= lots of
9
60
x shared by
9
2
=
70
8.
=
plus
9.
=
–
6 15 10 14
10.
=
6 15 12 14 4 5
of
40
plus
2,514
Thursday 2,697
1.
minus 1,949
2.
2,034
=
3.
90
x
4.
7,200
=
5.
270
=
800
=
plus = lots of
6
plus
÷
Wednesday 1.
769
90
x shared by
7
6.
=
896
minus 1,845 60
= lots of
9
90
x shared by
8
7.
÷
3
=
60
7.
÷
3
=
70
8.
=
plus
=
–
9.
=
–
4 11 4 19
10.
=
of
35
10.
=
5 11 12 19 4 5
plus
=
6 11 10 19
8.
9.
2 11 17 19 2 5
of
55
Friday 1.
=
2.
2,649
=
3.
70
x
4.
3,600
=
5.
540
=
6.
300
=
7.
905
plus
2,736
minus 2,965 60
= lots of
9
90
shared by
8
4
=
90
8.
=
plus
9.
=
–
5 11 4 19
10.
=
1 11 9 19 4 7
of
28
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 39
The answer to the question is 176. To get to the answer, Cho multiplied a number by 3, then doubled it and then took away 100. What number did Cho start with?
x
÷
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Ninja challenge
39
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 12 Monday
Tuesday
4.
9 13 1 5 9 15 3 4
5.
4
x
63
equals
5.
5
x
39
equals
6.
4
groups of
6
=
6.
8
groups of
4
=
7.
189
+
145
=
7.
152
+
123
=
8.
324
–
198
=
8.
451
–
165
=
9.
600 +
90
+2
=
9.
700 +
40
+5
=
10.
500 + 30 +
8
=
500 + 10 +
10.
100 + 20 +
9
=
100 + 10 +
1.
4.
5 7 1 4 3 11 7 8
5.
1. 2. 3.
–
6 13
=
1.
of
15
equals
2.
+
2 15
=
3.
of
24
equals
4.
5 14 1 8 3 15 3 8
Wednesday –
=
1.
of
20
equals
2.
+
5 11
=
3.
of
24
equals
4.
6 7 1 5 6 11 4 5
3
x
57
equals
5.
6.
9
groups of
5
=
7.
364
+
294
8.
461
–
9.
400 +
10.
200 + 30 +
3.
32
equals
+
3 15
=
of
32
equals
=
of
60
equals
+
1 11
=
of
35
equals
4
x
27
equals
6.
8
groups of
3
=
=
7.
389
+
152
=
234
=
8.
284
–
172
=
90
+1
=
9.
400 +
30
+2
=
3
=
200 + 10 +
10.
200 + 60 +
8
=
200 + 40 +
4. 5.
5
x
34
equals
6.
5
groups of
6
=
7.
546
+
198
=
8.
294
–
183
=
9.
500 +
50
+7
=
10.
200 + 70 +
3
=
200 + 50 +
3.
of
3 7
5 7 1 3 9 11 2 3
2.
=
–
Friday 1.
4 14
Thursday
1 7
2.
–
–
2 7
=
of
24
equals
+
1 11
=
of
18
equals
40
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 40
Ninja challenge
Sam creates 4 groups of 36. He says the total is equal to 12 times 12. Is Sam correct?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 12 Monday
Tuesday
1.
7,804 subtract
10
is equal to
1.
8,096
+
10
=
2.
7,804
+
100
=
2.
8,096
–
100
=
3.
7,804
–
1,000
=
3.
8,096
add
1,000
is equal to
4.
4,005
+
790
=
4.
7,500
+
90
=
5.
9,030
+
500
is equal to
5.
4,005
+
800
=
6.
36
÷
4
=
6.
14
÷
2
=
7.
360
÷
4
=
7.
140
÷
2
=
8.
3,600
÷
4
=
8.
1,400
÷
2
=
9.
1 2 1 6
1 4 1 6
of
48
is equal to
of
48
=
10.
of
24
is equal to
9.
of
24
=
10.
Wednesday
Thursday
1.
3,902
–
10
=
1.
4,097
2.
3,902
+
100
=
2.
4,097 subtract
3.
3,902
–
1,000
is equal to
3.
4,097
4.
5,030
add
503
=
4.
5.
609
+
4,030
=
6.
28
÷
7
7.
280
÷
8.
2,800
÷
9.
1 12 1 6
10.
10
=
100
=
+
1,000
=
67
+
5,900
=
5.
450
add
8,003
is equal to
=
6.
32
÷
4
=
7
is equal to
7.
320
÷
4
is equal to
7
=
8.
3,200
÷
4
=
1 12 1 6
of
60
is equal to
of
60
=
of
36
is equal to
9.
of
36
=
10.
Friday 1.
7,906
–
10
is equal to
2.
7,906
+
100
=
3.
7,906
–
1,000
is equal to
4.
5,040
add
300
=
5.
6
+
5,050
=
6.
72
÷
6
=
7.
720
÷
6
is equal to
8.
7,200
÷
6
=
9.
1 8 1 4
of
48
is equal to
of
48
=
10.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 41
+
Ninja challenge
Cho says that one quarter of 360 is equal to 90. Is Cho correct? Explain why.
41
15/09/2022 09:51
v
13
GRAND MASTER LEVEL
WEEK 12 Monday 1.
7
=
Tuesday groups of
7
1.
times
7
2.
72
equals
3.
60
x
30
=
6
=
groups of
8
times
9
2.
56
equals
3.
40
x
30
=
4.
=
50
lots of
60
4.
=
70
lots of
20
5.
is equal to
4
x
60
5.
is equal to
7
x
60
6.
=
254
x
6
6.
=
237
x
5
7.
x
4
=
96
7.
x
8
=
256
8.
=
plus
=
–
9.
=
–
5 19 5 12
10.
is equal to
of
16
10.
is equal to
6 19 9 12 3 7
plus
=
5 19 4 12
8.
9.
10 19 7 12 3 4
of
28
groups of
4
times
12
Wednesday 1.
5
=
Thursday groups of
9
1.
times
6
2.
60
equals
3.
70
x
70
=
8
=
2.
72
equals
3.
40
x
70
=
4.
=
90
lots of
60
4.
=
20
lots of
60
5.
is equal to
4
x
70
5.
is equal to
7
x
50
6.
=
184
x
3
6.
=
394
x
4
7.
x
6
=
258
7.
x
7
=
392
8.
=
plus
=
–
9.
=
–
10 20 6 14
10.
is equal to
of
45
10.
is equal to
9 20 12 14 7 8
plus
=
8 19 9 12
8.
9.
9 19 11 12 7 9
of
64
Friday 1.
=
6
groups of
4
times
11
2.
77
equals
3.
90
x
70
=
4.
=
50
lots of
80
5.
is equal to
6
x
90
6.
=
247
x
5
7.
x
6
=
276
8.
=
plus
9.
=
–
4 20 9 14
10.
is equal to
9 20 13 14 2 8
of
24
42
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 42
Ninja challenge
If Tom has 90 groups of 80. How many does he have in total?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 13 Monday 1.
63
2.
93
3. 4.
4 11 2 3
5.
more than less than
Tuesday
173
=
1.
56
184
equals
2.
78
more than less than
198
=
201
equals
+
3 11
is equal to
of
40
equals
+
5 11
is equal to
3.
of
12
equals
4.
5 11 2 5
3
x
43
equals
5.
4
x
38
equals
6.
5
groups of
4
=
6.
6
groups of
8
=
7.
6
x
3
=
7.
7
x
2
=
8.
9
times
4
is equal to
8.
5
times
9
is equal to
9.
half
of
80
=
9.
half
of
100
=
10.
quarter
of
8
=
10.
quarter
of
20
=
1.
84
2.
92
more than less than
3. 4.
3 12 5 8
more than less than
5.
Wednesday
Thursday
283
=
1.
82
341
equals
2.
74
+
6 12
is equal to
3.
of
48
equals
4.
4 12 4 5
5
x
55
equals
5.
6.
7
groups of
8
=
7.
9
x
2
8.
3
times
9.
half
10.
183
=
231
equals
+
6 12
is equal to
of
45
equals
8
x
24
equals
6.
4
groups of
8
=
=
7.
3
x
4
=
6
is equal to
8.
2
times
5
is equal to
of
60
=
9.
half
of
8
=
quarter
of
16
=
10.
quarter
of
40
=
1.
97
2.
83
3. 4.
1 9 3 8
more than less than
5.
Friday 176
=
153
equals
+
6 9
is equal to
of
24
equals
3
x
73
equals
6.
2
groups of
8
=
7.
10
x
4
=
8.
8
times
5
is equal to
9.
half
of
80
=
10.
quarter
of
80
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 43
Ninja challenge
Iko is thinking of a number. She says her number is equal to 9 groups of 4. What number is Iko thinking of?
43
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 13 Monday
Tuesday
1.
4,583
+
678
=
1.
7,482
+
789
=
2.
4,283
+
678
=
2.
7,382
+
589
=
3.
48
÷
8
=
3.
42
÷
7
=
4.
480
÷
8
=
4.
420
÷
7
=
5.
4,800
÷
8
=
5.
4,200
÷
7
=
6.
346
x
3
=
6.
673
x
2
=
7.
346
x
5
=
7.
673
x
4
=
8.
1 9 4 9 7 9
1 5 3 5 4 5
of
35
is equal to
of
35
is equal to
of
35
is equal to
9. 10.
of
72
is equal to
8.
of
72
is equal to
9.
of
72
is equal to
10.
Wednesday
Thursday
1.
7,593
+
1,337
=
1.
6,395
+
876
=
2.
6,493
+
1,237
=
2.
6,495
+
1,976
=
3.
56
÷
7
=
3.
24
÷
8
=
4.
560
÷
7
=
4.
240
÷
8
=
5.
5,600
÷
7
=
5.
2,400
÷
8
=
6.
364
x
3
=
6.
573
x
2
=
7.
364
x
4
=
7.
573
x
5
=
8.
1 7 3 7 6 7
of
56
is equal to
8.
of
24
is equal to
of
56
is equal to
9.
of
24
is equal to
of
56
is equal to
10.
1 8 3 8 6 8
of
24
is equal to
9. 10.
Friday 1.
4,574
+
2,485
=
2.
1,474
+
2,385
=
3.
36
÷
9
=
4.
360
÷
9
=
5.
3,600
÷
9
=
6.
679
x
4
=
7.
679
x
3
=
8.
1 9 4 9 7 9
of
36
is equal to
of
36
is equal to
of
36
is equal to
9. 10. 44
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 44
Ninja challenge
Iko says that 153 groups of 3 is equal to 450. Is Iko correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 13 Monday 1.
36
2.
= equals
7
Tuesday x
4
1.
times
8
2.
=
4,800
3.
50
groups of
4.
3,000
=
60
lots of
42
= equals
5
x
6
times
9
=
4,000
3.
80
groups of
4.
2,800
=
70
lots of
5.
is equal to
5
x
60
5.
is equal to
7
x
60
6.
=
169
multiplied by
4
6.
=
254
multiplied by
5
=
7.
94
x
3
8.
=
9.
19 20 5 14
10.
18
is equal to
11 20 12 14 6 8
=
7.
84
x
5
=
+
8.
=
9.
of
10.
20
is equal to
14 20 13 14 4 5
+
minus
18 20 4 14
Wednesday 1.
63
2.
= equals
9
of
x
7
1.
times
9
2.
=
4,800
3.
60
groups of
4.
6,400
=
80
is equal to
7
x
70
=
415
multiplied by
7
60
groups of
4.
4,000
=
80
lots of
is equal to
3
x
=
364
multiplied by
6.
minus
Thursday
3. 5.
=
90 6
24
= equals
5. 6.
7
x
3
times
9
=
3,600
lots of
7.
95
x
4
=
7.
68
x
3
=
8.
=
8.
=
9.
21
is equal to
of
10.
3
is equal to
3 25 11 16 1 3
+
minus
5 25 5 16
10.
19 25 15 16 7 9
+
9.
23 25 3 16
=
Friday 1.
72
2.
= equals
12
x
9
times
9
=
8,100
3.
90
groups of
4.
4,900
=
70
lots of
5.
is equal to
4
x
40
6.
=
623
multiplied by
4
7.
73
x
5
=
8.
=
10.
6
is equal to
3 9 15 16 1 6
+
9.
8 9 1 16
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 45
=
minus of
Ninja challenge
Tom adds an unknown number to 1,047 and gets an answer of 7,273. What is Tom’s unknown number?
minus of 45
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 14 Monday 1.
163
2.
152
3. 4.
2 3 3 4
5. 6.
more than less than
Tuesday
284
=
1.
174
365
equals
2.
192
more than less than
273
=
321
equals
–
1 7
is equal to
of
35
equals
–
1 3
is equal to
3.
of
16
equals
4.
6 7 3 5
3
times
36
equals
5.
4
times
45
equals
2
groups of
8
=
6.
3
groups of
7
=
7.
10
multiplied by
9
=
7.
4
multiplied by
9
=
8.
30
times
3
is equal to
8.
40
times
5
is equal to
9.
24
divided by
3
=
9.
18
divided by
3
=
10.
360
shared by
4
=
10.
250
shared by
5
=
1.
254
2.
291
more than less than
3. 4.
5 7 3 8
more than less than
5.
Wednesday
Thursday
284
=
1.
203
365
equals
2.
194
–
3 7
is equal to
3.
of
16
equals
4.
6 7 3 4
5
times
67
equals
5.
6.
4
groups of
4
=
7.
8
multiplied by
8
8.
20
times
9.
15
10.
302
=
295
equals
–
1 7
is equal to
of
44
equals
8
times
34
equals
6.
5
groups of
4
=
=
7.
5
multiplied by
5
=
7
is equal to
8.
30
times
8
is equal to
divided by
3
=
9.
45
divided by
5
=
720
shared by
8
=
10.
320
shared by
8
=
1.
263
2.
174
3. 4.
5 7 3 5
more than less than
5. 6.
Friday 321
=
305
equals
–
3 7
is equal to
of
40
equals
4
times
23
equals
2
groups of
6
=
7.
12
multiplied by
5
=
8.
60
times
8
is equal to
9.
48
divided by
4
=
10.
180
shared by
3
=
46
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 46
Ninja challenge
Tom counts on 191 more than 132. What answer does Tom get?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 14 Monday
Tuesday
1.
4,593
+
785
=
1.
3,583
+
1,473
=
2.
3,493
+
685
=
2.
2,483
+
1,373
=
3.
56
÷
8
=
3.
33
÷
3
=
4.
560
÷
8
=
4.
330
÷
3
=
5.
5,600
÷
8
=
5.
3,300
÷
3
=
6.
768
x
3
=
6.
453
x
4
=
7.
768
x
5
=
7.
453
x
2
=
8.
1 8 5 8 7 8
1 11 5 11 7 11
of
33
is equal to
of
33
is equal to
of
33
is equal to
9. 10.
of
56
is equal to
8.
of
56
is equal to
9.
of
56
is equal to
10.
Wednesday
Thursday
1.
6,934
+
863
=
1.
3,943
+
1,955
=
2.
5,734
+
663
=
2.
3,743
+
2,955
=
3.
42
÷
6
=
3.
64
÷
8
=
4.
420
÷
6
=
4.
640
÷
8
=
5.
4,200
÷
6
=
5.
6,400
÷
8
=
6.
645
x
5
=
6.
732
x
2
=
7.
645
x
3
=
7.
732
x
5
=
8.
1 6 4 6 5 6
of
42
is equal to
8.
of
64
is equal to
of
42
is equal to
9.
of
64
is equal to
of
42
is equal to
10.
1 8 5 8 7 8
of
64
is equal to
9. 10.
Friday 1.
6,483
+
865
=
2.
4,383
+
265
=
3.
44
÷
11
=
4.
440
÷
11
=
5.
4,400
÷
11
=
6.
435
x
3
=
7.
435
x
4
=
8.
1 11 8 11 9 11
of
44
is equal to
of
44
is equal to
of
44
is equal to
9. 10.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 47
Ninja challenge
Iko says that 153 groups of 3 is equal to 450. Is Iko correct? Explain why.
47
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 14 Monday 1.
8
2.
=
Tuesday ÷
9
1.
9
2.
equals
108
÷
8
=
÷
6 9
equals
54
÷
3.
8,100
÷
90
=
3.
4,200
÷
60
=
4.
70
=
4,900
÷
4.
50
=
2,500
÷
5.
is equal to
160
÷
40
5.
is equal to
150
÷
30
6.
=
184
x
3
6.
=
273
x
5
x
4
=
x
6
=
8.
plus subtract
10.
is equal to
3 9 8 17 4 9
=
9.
3 9 13 16 4 6
7.
86
7.
75
8.
plus
equals
7 9 2 16
9.
subtract
of
36
10.
is equal to
=
Wednesday 1.
6
2.
=
equals
6 9 7 17
of
36
÷
6 7
Thursday ÷
6
1.
9
2.
equals
27
÷
7
= equals
35
÷
3.
1,200
÷
60
=
3.
6,400
÷
80
=
4.
60
=
1,800
÷
4.
80
=
2,400
÷
5.
is equal to
210
÷
70
5.
is equal to
490
÷
70
6.
=
345
x
6
6.
=
426
x
7
x
7
=
x
7
=
8.
plus
=
subtract
10.
is equal to
3 8 3 16 7 9
=
9.
3 9 8 17 7 8
7.
48
7. 8.
plus
equals
8 9 4 17
9.
subtract
of
56
10.
is equal to
Friday 1.
7
2.
=
÷
9 9
equals
81
÷
3.
5,400
÷
90
=
4.
80
=
2,400
÷
5.
is equal to
300
÷
60
6.
=
325
x
6
x
8
=
8.
plus
=
9.
subtract
10.
is equal to
4 8 5 16 2 5
7.
65
48
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 48
57
equals
5 8 6 16
of
15
equals
7 8 10 16
of
27
Ninja challenge
Iko doubles 600 and then quarters the answer. What number does Iko finish with?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 15 Monday
Tuesday
1.
364
add
300
=
1.
463
add
400
=
2.
891
subtract
700
equals
2.
475
subtract
300
equals
3.
more than
6 17
is equal to
3.
7 17
is equal to
of
80
equals
4.
3 17 3 4
more than
4.
5 17 2 8
of
36
equals
5.
2
times
87
equals
5.
3
times
48
equals
6.
3
groups of
6
=
6.
5
groups of
8
=
7.
30
multiplied by
5
=
7.
40
multiplied by
7
=
8.
600
times
2
is equal to
8.
500
times
3
is equal to
9.
180
divided by
3
=
9.
210
divided by
3
=
10.
2,000
shared by
5
=
10.
1,200
shared by
4
=
Wednesday
Thursday
1.
273
add
300
=
1.
419
add
500
=
2.
916
subtract
200
equals
2.
384
subtract
200
equals
3.
more than
9 17
is equal to
3.
7 19
is equal to
of
15
equals
4.
10 19 3 4
more than
4.
5 17 2 3
of
40
equals
5.
8
times
34
equals
5.
8
times
27
equals
6.
9
groups of
3
=
6.
4
groups of
3
=
7.
60
multiplied by
3
=
7.
50
multiplied by
4
=
8.
600
times
3
is equal to
8.
800
times
2
is equal to
9.
160
divided by
4
=
9.
360
divided by
4
=
10.
2,100
shared by
3
=
10.
2,500
shared by
5
=
Friday 1.
847
add
100
=
2.
746
subtract
600
equals
3.
more than
13 19
is equal to
4.
5 19 3 5
of
45
equals
5.
4
times
65
equals
6.
5
groups of
9
=
7.
60
multiplied by
4
=
8.
900
times
2
is equal to
9.
450
divided by
5
=
10.
2,700
shared by
3
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 49
Ninja challenge
Tom listens to a song that is 235 seconds long. Sam listens to a song that is 217 seconds long. Altogether, how long were Tom and Sam listening to songs?
49
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 15 Monday
Tuesday
1.
5,385
–
1,485
=
1.
7,593
–
864
=
2.
6,385
–
1,486
=
2.
8,693
–
764
=
3.
3
x
9
=
3.
4
x
3
=
4.
30
x
90
=
4.
300
x
4
=
5.
270
÷
9
=
5.
120
÷
30
=
6.
351
x
6
=
6.
264
x
7
=
7.
351
x
8
=
7.
264
x
9
=
8.
2 9 5 9 7 9
2 8 5 8 7 8
of
56
is equal to
of
56
is equal to
of
56
is equal to
9. 10.
of
54
is equal to
8.
of
54
is equal to
9.
of
54
is equal to
10.
Wednesday
Thursday
1.
4,943
–
1,864
=
1.
7,375
–
1,586
=
2.
5,943
–
1,964
=
2.
8,475
–
1,586
=
3.
4
x
6
=
3.
5
x
3
=
4.
40
x
6
=
4.
5
x
30
=
5.
2,400
÷
6
=
5.
1,500
÷
3
=
6.
683
x
6
=
6.
273
x
7
=
7.
683
x
9
=
7.
273
x
9
=
8.
2 9 5 9 7 9
of
108
is equal to
8.
of
108
is equal to
of
108
is equal to
9.
of
108
is equal to
of
108
is equal to
10.
2 9 5 9 7 9
of
108
is equal to
9. 10.
Friday 1.
4,693
–
976
=
2.
5,793
–
876
=
3.
8
x
4
=
4.
80
x
4
=
5.
3,200
÷
8
=
6.
349
x
6
=
7.
349
x
8
=
8.
2 7 5 7 6 7
of
56
is equal to
of
56
is equal to
of
56
is equal to
9. 10. 50
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 50
Ninja challenge
Tom shares 2,000 by 400. What answer does Tom have?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 15 Monday
Tuesday
1.
=
81
÷
9
1.
=
20
÷
4
2.
equals
21
÷
7
2.
equals
30
÷
5
=
40
3.
=
70
3.
2,400
÷
4,200
÷
4.
=
3,600
÷
40
4.
=
8,100
÷
90
5.
is equal to
450
÷
90
5.
is equal to
480
÷
60
6.
=
123
x
5
6.
=
459
x
5
x
9
=
x
9
=
8.
plus subtract
10.
is equal to
12 23 10 19 4 6
=
9.
7 23 9 19 4 7
7.
83
7.
46
8.
plus
=
21 23 9 19
9.
subtract
of
35
10.
is equal to
=
Wednesday
=
22 23 7 19
of
48
Thursday
1.
=
48
÷
4
1.
=
55
÷
5
2.
equals
42
÷
7
2.
equals
49
÷
7
=
50
3.
=
90
3.
1,500
÷
2,700
÷
4.
=
7,200
÷
90
4.
=
5,400
÷
90
5.
is equal to
350
÷
50
5.
is equal to
720
÷
80
6.
=
625
x
7
6.
=
384
x
6
x
8
=
x
6
=
8.
plus
=
subtract
10.
is equal to
9 34 8 21 5 8
=
9.
11 34 11 21 4 9
7.
51
7. 8.
plus
=
33 34 8 21
9.
subtract
of
54
10.
is equal to
Friday 1.
=
64
÷
8
2.
equals
18
÷
3
=
20
3.
1,200
÷
4.
=
1,500
÷
30
5.
is equal to
120
÷
40
6.
=
246
x
9
x
7
=
8.
plus
=
9.
subtract
10.
is equal to
15 34 18 21 5 8
7.
85
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 51
95
=
30 34 2 21
of
16
=
29 34 7 21
of
16
Ninja challenge
Sam says that if he doubles the numbers 34 and 35, the difference between the answers is 2. Is Sam correct? Explain why.
51
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 16 Monday 1.
1,247
2. 3.
Tuesday
+
132
=
1.
1,623
1,845
–
143
equals
2.
less than
18 19
is equal to
3.
4.
9 19 3 4
of
24
equals
5.
5
x
42
6.
3
x
7.
40
8.
+
231
=
1,867
–
341
equals
less than
19 20
is equal to
4.
9 20 3 8
of
24
equals
equals
5.
8
x
36
equals
7
=
6.
5
x
8
=
x
8
=
7.
60
x
5
=
600
x
5
is equal to
8.
800
x
5
is equal to
9.
270
÷
3
=
9.
350
÷
5
=
10.
4,500
÷
5
=
10.
6,000
÷
5
=
Wednesday
Thursday
1.
1,104
+
482
=
1.
1,363
+
319
=
2.
1,947
–
815
equals
2.
1,374
–
253
equals
3.
less than
10 20
is equal to
3.
9 12
is equal to
of
16
equals
4.
1 12 3 4
less than
4.
1 20 7 8
of
28
equals
5.
2
x
89
equals
5.
8
x
34
equals
6.
3
x
8
=
6.
5
x
8
=
7.
20
x
9
=
7.
40
x
7
=
8.
400
x
4
is equal to
8.
800
x
8
is equal to
9.
330
÷
3
=
9.
240
÷
3
=
10.
1,500
÷
3
=
10.
1,400
÷
2
=
Friday 1.
1,360
2. 3.
+
426
=
1,857
–
506
equals
less than
9 12
is equal to
4.
5 12 2 3
of
15
equals
5.
4
x
56
equals
6.
6
x
8
=
7.
80
x
7
=
8.
400
x
8
is equal to
9.
200
÷
4
=
10.
3,000
÷
6
=
52
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 52
Ninja challenge
Iko finds 82 books in the library that are red. Cho looks for green books and finds half the amount of Iko. How many green books does Cho find?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 16 Monday
Tuesday
1.
7,583
–
1,586
=
1.
6,493
–
789
=
2.
8,483
–
2,586
=
2.
4,393
–
689
=
3.
4
x
9
=
3.
3
x
9
=
4.
40
x
9
=
4.
3
x
90
=
5.
3,600
÷
9
=
5.
270
÷
9
=
6.
284
x
6
=
6.
643
x
7
=
7.
284
x
9
=
7.
643
x
8
=
8.
3 10 7 10 9 10
3 12 7 12 9 12
of
84
is equal to
of
84
is equal to
of
84
is equal to
9. 10.
of
80
is equal to
8.
of
80
is equal to
9.
of
80
is equal to
10.
Wednesday
Thursday
1.
6,795
–
2,463
=
1.
5,584
–
678
=
2.
4,695
–
2,563
=
2.
3,584
–
478
=
3.
2
x
12
=
3.
7
x
8
=
4.
20
x
12
=
4.
70
x
8
=
5.
2,400
÷
2
=
5.
5,600
÷
8
=
6.
674
x
6
=
6.
752
x
8
=
7.
674
x
7
=
7.
752
x
9
=
8.
3 11 10 11 9 11
of
88
is equal to
8.
of
72
is equal to
of
88
is equal to
9.
of
72
is equal to
of
88
is equal to
10.
3 8 5 8 7 8
of
72
is equal to
9. 10.
Friday 1.
4,569
–
1,694
=
2.
6,569
–
694
=
3.
3
x
11
=
4.
3
x
110
=
5.
3,300
÷
3
=
6.
684
x
7
=
7.
684
x
9
=
8.
2 5 3 5 4 5
of
35
is equal to
of
35
is equal to
of
35
is equal to
9. 10.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 53
Ninja challenge
Cho finds the difference between 5,043 and 2,939. What answer does Cho get?
53
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 16 Monday
Tuesday
1.
=
32
÷
8
1.
=
36
÷
9
2.
equals
27
÷
3
2.
equals
45
÷
9
=
80
3.
=
70
3.
3,200
÷
5,600
÷
4.
=
2,400
÷
30
4.
=
3,200
÷
40
5.
is equal to
250
÷
50
5.
is equal to
630
÷
70
6.
=
564
x
3
6.
=
274
x
6
x
7
=
x
8
=
is equal to
8
x
is equal to
7
x
times
90
=
times
50
=
equals
5
groups of
equals
3
groups of
900
7.
48
8. 9.
40
10.
7. 4
8. 9.
400
54 30
10.
Wednesday
8
Thursday
1.
=
42
÷
7
1.
=
84
÷
7
2.
equals
54
÷
6
2.
equals
42
÷
6
=
30
3.
=
90
3.
2,700
÷
4,500
÷
4.
=
4,000
÷
80
4.
=
1,800
÷
60
5.
is equal to
360
÷
40
5.
is equal to
720
÷
90
6.
=
361
x
7
6.
=
283
x
5
x
8
=
x
6
=
is equal to
6
x
is equal to
8
x
times
50
=
times
30
=
equals
7
groups of
equals
8
groups of
7.
65
8. 9.
50
10.
7. 5
Friday 1.
=
54
÷
9
2.
equals
132
÷
12
=
120
3.
8,400
÷
4.
=
1,400
÷
70
5.
is equal to
550
÷
50
6.
=
361
x
7
x
9
=
is equal to
5
x
times
30
=
equals
5
groups of
7.
83
8. 9. 10.
90
54
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 54
8. 9.
600
95
10.
70
9 700
Ninja challenge
Cho starts with the number 1,583. She finishes with 989. How much did Cho subtract to get to 989?
12 900 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 17 Monday
Tuesday
1.
6
x
6
=
1.
7
x
8
=
2.
9
x
4
=
2.
9
x
7
=
3.
49
÷
7
=
3.
81
÷
9
=
4.
36
÷
6
=
4.
63
÷
9
=
5.
6
x
25
equals
5.
7
x
32
equals
6.
6
x
8
=
6.
9
x
8
=
7.
30
x
9
=
7.
30
x
7
=
8.
200
x
7
is equal to
8.
200
x
9
is equal to
9.
500
÷
5
=
9.
400
÷
8
=
10.
4,200
÷
6
=
10.
7,200
÷
9
=
Wednesday
Thursday
1.
6
x
8
=
1.
9
x
8
=
2.
6
x
7
=
2.
9
x
7
=
3.
45
÷
9
=
3.
63
÷
7
=
4.
54
÷
9
=
4.
56
÷
7
=
5.
8
x
42
equals
5.
7
x
36
equals
6.
8
x
6
=
6.
8
x
7
=
7.
70
x
6
=
7.
60
x
6
=
8.
800
x
8
is equal to
8.
600
x
6
is equal to
9.
540
÷
6
=
9.
720
÷
6
=
10.
4,900
÷
7
=
10.
6,300
÷
7
=
Friday 1.
11
x
8
=
2.
11
x
6
=
3.
77
÷
7
=
4.
99
÷
9
=
5.
9
x
26
equals
6.
9
x
7
=
7.
70
x
7
=
8.
700
x
7
is equal to
9.
320
÷
8
=
10.
3,200
÷
8
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 55
Ninja challenge
Sam says that if he adds 100, 300, 200 and 300 that he will have a number larger than 1000. Is Sam correct?
55
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 17 Monday 1.
5,495
2.
+
Tuesday =
6,173
1.
1,878
2.
–
3,295
=
8
=
3.
3
x
4.
3
x
=
5.
2,400
÷
=
6.
646
x
4
7.
646
x
9
8.
2 9 2 9 2 9
9. 10.
7,531
3,596
2.
=
450
800
5.
450
÷
=
50
=
6.
385
x
5
=
=
7.
385
x
8
=
3 5 3 5 3 5
of
45
is equal to
of
60
is equal to
of
15
is equal to
63
is equal to
8.
of
72
is equal to
9.
of
81
is equal to
10.
Thursday =
4,465
1.
2,796
2.
–
2,669
=
8
=
x
=
5.
3,200
÷
=
6.
684
x
7
7.
684
x
8.
5 8 5 8 5 8
+
=
6,183 7,697
–
486
=
7
=
4
x
320
4.
4
x
=
280
800
5.
2,800
÷
=
700
=
6.
857
x
4
=
3
=
7.
857
x
9
=
of
64
is equal to
8.
of
28
is equal to
of
24
is equal to
9.
of
84
is equal to
of
96
is equal to
10.
3 7 3 7 3 7
of
70
is equal to
+
=
7,200 4,043
–
4,357
=
6
=
3.
9
x
4.
9
x
=
540
5.
540
÷
=
90
6.
583
x
8
=
7.
583
x
4
=
8.
5 11 5 11 5 11
of
77
is equal to
of
66
is equal to
of
132
is equal to
10.
4,697
3.
Friday
9.
=
x
8
2.
5
90
4.
3,853
=
4.
x
1.
4,251
240
4
10.
3,693
– x
3.
9.
9,014
9
of
+
=
3.
Wednesday 1.
+
56
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 56
Ninja challenge
Iko says that 2,758 is 834 more than 1,985. Is Iko correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 17 Monday
Tuesday
1.
=
6
x
7
1.
=
8
x
9
2.
equals
9
x
12
2.
equals
7
x
12
=
96
3.
=
56
3.
8
x
8
x
4.
=
2
x
70
4.
=
6
x
40
5.
is equal to
10
x
4
5.
is equal to
10
x
9
6.
=
30
x
30
6.
=
60
x
30
x
300
=
x
600
=
is equal to
6
x
is equal to
8
x
times
3
=
times
5
=
equals
7
groups of
equals
6
groups of
523
7.
5
8. 9.
163
10.
7. 15
8. 9.
68
7 231
10.
Wednesday
23
Thursday
1.
=
6
x
7
1.
=
8
x
7
2.
equals
9
x
12
2.
equals
9
x
7
=
81
3.
=
36
3.
9
x
9
x
4.
=
8
x
40
4.
=
9
x
20
5.
is equal to
10
x
12
5.
is equal to
10
x
23
6.
=
90
x
30
6.
=
50
x
60
x
500
=
x
500
=
is equal to
9
x
is equal to
9
x
times
4
=
times
5
=
equals
7
groups of
equals
8
groups of
7.
4
8. 9.
173
10.
7. 19
Friday 1.
=
4
x
7
2.
equals
3
x
8
=
9
3.
3
x
4.
=
8
x
70
5.
is equal to
10
x
19
6.
=
70
x
30
x
500
=
is equal to
7
x
times
6
=
equals
5
groups of
7.
9
8. 9. 10.
214
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 57
8. 9.
625
6
10.
165
32 364
Ninja challenge
Iko says that the total of 3,482 and 2,329 is 5,711. Is Iko correct? Explain why.
22 651 57
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 18 Monday
Tuesday
1.
7
x
8
=
1.
9
x
8
=
2.
7
x
6
=
2.
7
x
8
=
3.
42
÷
7
=
3.
21
÷
7
=
4.
36
÷
9
=
4.
54
÷
9
=
5.
of
18
equals
5.
24
equals
of
14
=
6.
of
28
=
of
18
=
7.
1 6 1 7 1 9
of
7.
1 6 1 7 1 9
of
36
=
8.
400
x
7
is equal to
8.
500
x
7
is equal to
9.
240
÷
8
=
9.
320
÷
8
=
10.
2,700
÷
9
=
10.
3,500
÷
5
=
6.
Wednesday
Thursday
1.
9
x
8
=
1.
6
x
8
=
2.
8
x
8
=
2.
12
x
8
=
3.
63
÷
7
=
3.
84
÷
7
=
4.
72
÷
9
=
4.
108
÷
9
=
5.
of
36
equals
5.
24
equals
of
49
=
6.
of
42
=
of
81
=
7.
1 6 1 7 1 9
of
7.
1 6 1 7 1 9
of
72
=
8.
400
x
9
is equal to
8.
600
x
9
is equal to
9.
480
÷
8
=
9.
720
÷
8
=
10.
6,300
÷
7
=
10.
8,100
÷
9
=
6.
Friday 1.
6
x
6
=
2.
8
x
8
=
3.
49
÷
7
=
4.
81
÷
9
=
5.
of
18
equals
of
56
=
7.
1 6 1 7 1 9
of
63
=
8.
400
x
9
is equal to
9.
210
÷
7
=
10.
1,800
÷
9
=
6.
58
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 58
Ninja challenge
Iko counts on 7 from 367. What number does Iko count on to?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 18 Monday 1.
5,694
2.
+
Tuesday =
7,650
1.
5,956
2.
–
2,494
=
6
=
3.
12
x
4.
12
x
=
5.
7,200
÷
=
6.
854
x
3
7.
854
x
8
8.
3 8 3 8 3 8
9. 10.
3,495
5,684
2.
=
180
1,200
5.
1,800
÷
=
300
=
6.
582
x
4
=
=
7.
582
x
6
=
5 6 5 6 5 6
of
36
is equal to
of
54
is equal to
of
72
is equal to
64
is equal to
8.
of
32
is equal to
9.
of
16
is equal to
10.
Thursday =
6,438
1.
854
2.
–
6,684
=
7
=
x
=
5.
4,200
÷
=
6.
639
x
9
7.
639
x
8.
5 12 5 12 5 12
+
=
5,080 4,385
–
2,395
=
9
=
7
x
420
4.
7
x
=
630
600
5.
6,300
÷
=
700
=
6.
482
x
4
=
2
=
7.
482
x
9
=
of
36
is equal to
8.
of
36
is equal to
of
84
is equal to
9.
of
63
is equal to
of
108
is equal to
10.
7 9 7 9 7 9
of
108
is equal to
+
=
6,563 5,994
–
1,469
=
7
=
3.
8
x
4.
7
x
=
560
5.
5,600
÷
=
700
6.
984
x
6
=
7.
984
x
8
=
8.
3 9 3 9 3 9
of
45
is equal to
of
18
is equal to
of
99
is equal to
10.
3,585
3.
Friday
9.
=
x
6
2.
6
3
4.
5,694
=
4.
x
1.
2,495
720
6
10.
3,788
– x
3.
9.
4,463
3
of
+
=
3.
Wednesday 1.
+
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 59
Ninja challenge
Iko says that 1,000 less than 4,094 is greater than 100 more than 2,994. Is Iko correct? Explain why.
59
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 18 Monday
Tuesday
1.
21
=
x
7
1.
84
=
x
7
2.
40
equals
x
8
2.
63
equals
x
9
=
18
3.
=
54
x
70
4.
x
70
35
5.
45
3. 4.
x 350
5.
= is equal to
10
x
50
x
6.
1,500
=
7.
2
x
8. 9.
254
10.
6
4
=
equals
6
groups of
9. 732
x
70
x
x
8.
times
10
12
15
x
is equal to
=
7.
183
10.
Wednesday
6
=
5,600
1,000
5
490
6.
=
is equal to
x
=
6,000 24
is equal to
7
x
times
3
=
equals
6
groups of
824
Thursday
1.
108
=
x
9
1.
42
=
x
7
2.
48
equals
x
12
2.
144
equals
x
12
=
72
3.
=
132
x
70
4.
x
120
25
5.
47
3. 4.
x 630
5.
= is equal to
10
x
90
x
6.
7,200
=
7.
8
x
8. 9.
263
10.
6
3
=
equals
7
groups of
9. 485
Friday 1.
84
=
x
7
2.
24
equals
x
12
=
72
x
110 53
3. 4.
x 550
5.
= is equal to
10
x
60
x
6.
1,800
=
7.
7
x
8. 9. 10.
207
6
=
2,800 58
is equal to
3
x
times
3
=
equals
7
groups of
60
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 60
x
20
x
x
8.
times
10
5
34
x
is equal to
=
7.
10.
184
11
=
1,600
4,800
5
720
6.
=
is equal to
x
=
4,500 67
is equal to
2
x
times
3
=
equals
9
groups of
506
Ninja challenge
Sam has 80 groups of 50. How many does Sam have in total?
609 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 19 Monday
Tuesday
1.
7
x
6
=
1.
7
x
8
=
2.
8
x
7
=
2.
8
x
8
=
3.
49
÷
7
=
3.
48
÷
8
=
4.
63
÷
9
=
4.
63
÷
7
=
5.
of
18
equals
5.
24
equals
of
56
=
6.
of
14
=
of
63
=
7.
2 6 2 7 2 9
of
7.
2 6 2 7 2 9
of
27
=
8.
263
+
98
=
8.
363
+
194
=
9.
1,038
+
263
is equal to
9.
1,363
+
374
is equal to
10.
1,352
+
1,267
=
10.
1,375
+
1,571
=
6.
Wednesday
Thursday
1.
9
x
8
=
1.
6
x
8
=
2.
7
x
9
=
2.
6
x
9
=
3.
81
÷
9
=
3.
72
÷
6
=
4.
84
÷
7
=
4.
54
÷
6
=
5.
of
36
equals
5.
54
equals
of
49
=
6.
of
21
=
of
81
=
7.
2 6 2 7 2 9
of
7.
2 6 2 7 2 9
of
90
=
8.
475
+
372
=
8.
571
+
389
=
9.
1,462
+
289
is equal to
9.
1,472
+
763
is equal to
10.
1,784
+
1,382
=
10.
1,781
+
1,694
=
6.
Friday 1.
6
x
7
=
2.
7
x
9
=
3.
72
÷
8
=
4.
56
÷
7
=
5.
of
24
equals
of
35
=
7.
2 6 2 7 2 9
of
63
=
8.
873
+
462
=
9.
1,475
+
801
is equal to
10.
1,374
+
1,895
=
6.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 61
Ninja challenge
Cho counts back 80 from 468. What number does Cho count back to?
61
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 19 Monday
Tuesday
1.
4,395
+
=
6,892
1.
6,943
+
=
7,822
2.
7,992
–
=
7,395
2.
6,322
–
=
3,443
3.
56
÷
3.
32
÷
4
=
4.
of
56
=
4.
32
=
of
56
=
5.
1 8 3 8
of
5.
1 7 3 7
of
32
=
6.
50
÷
10
=
6.
40
÷
10
=
7.
5
÷
10
=
7.
4
÷
10
=
8.
55
÷
10
=
8.
44
÷
10
=
9.
563
x
2
=
9.
586
x
3
=
10.
5
x
865
=
10.
4
x
563
=
8
=
Wednesday
Thursday
1.
4,954
+
=
7,339
1.
4,382
+
=
5,167
2.
8,439
–
=
5,485
2.
6,367
–
=
4,085
3.
48
÷
3.
36
÷
4
=
4.
of
48
=
4.
36
=
of
48
=
5.
1 9 5 9
of
5.
1 6 5 6
of
36
=
6.
80
÷
10
=
6.
20
÷
10
=
7.
8
÷
10
=
7.
2
÷
10
=
8.
88
÷
10
=
8.
22
÷
10
=
9.
485
x
5
=
9.
583
x
4
=
10.
2
x
906
=
10.
5
x
754
=
8
=
Friday 1.
7,596
+
=
8,828
2.
7,928
–
=
6,496
3.
32
÷
4
=
4.
of
32
=
5.
1 8 5 8
of
32
=
6.
70
÷
10
=
7.
7
÷
10
=
8.
77
÷
10
=
9.
694
x
5
=
10.
7
x
974
=
62
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 62
Ninja challenge
Tom shares 48 counters equally into 6 groups. How many counters will be in each group?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 19 Monday
Tuesday
1.
=
9
x
7
1.
=
5
x
7
2.
=
5
x
12
2.
=
9
x
12
x
6
=
x
6
=
4.
=
5
x
90
4.
=
7
x
70
5.
=
10
x
0.4
5.
=
10
x
0.9
6.
=
50
x
30
6.
=
60
x
30
x
600
=
x
800
=
=
5
x
=
4
x
x
3
=
x
4
=
=
6
x
=
8
x
731
3.
7.
8
7
8. 9.
312
10.
3.
7. 63
3
8. 9.
832
12
238
10.
Wednesday
32
Thursday
1.
=
6
x
7
1.
=
5
x
7
2.
=
8
x
8
2.
=
8
x
9
x
6
=
x
6
=
4.
=
9
x
90
4.
=
7
x
90
5.
=
10
x
0.2
5.
=
10
x
0.4
6.
=
70
x
30
6.
=
90
x
60
x
500
=
x
700
=
=
4
x
=
3
x
x
3
=
x
4
=
=
6
x
=
8
x
3.
7.
9
6
8. 9.
354
10.
3.
7. 56
Friday 1.
=
12
x
11
2.
=
12
x
12
x
9
=
4.
=
20
x
90
5.
=
10
x
0.6
6.
=
30
x
40
x
700
=
=
5
x
x
4
=
=
7
x
3.
7.
12
3
8. 9. 10.
523
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 63
9
8. 9.
563
6
10.
378
72 672
Ninja challenge
Iko tells Sam that she has 24 and that 24 is equal to 38 of 64. Is Iko correct? Explain why.
62 714 63
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 20 Monday
Tuesday
1.
6
x
9
=
1.
6
x
8
=
2.
23
x
6
=
2.
32
x
7
=
3.
13
x
7
=
3.
15
x
8
=
4.
63
÷
7
=
4.
63
÷
9
=
5.
of
24
equals
5.
18
equals
of
35
=
6.
of
28
=
of
63
=
7.
3 6 3 7 3 9
of
7.
3 6 3 7 3 9
of
36
=
8.
873
–
462
=
8.
947
–
163
=
9.
1,475
–
263
is equal to
9.
1,364
–
243
is equal to
10.
1,374
–
1,126
=
10.
2,476
–
1,324
=
6.
Wednesday
Thursday
1.
9
x
8
=
1.
7
x
8
=
2.
24
x
9
=
2.
32
x
9
=
3.
17
x
7
=
3.
23
x
7
=
4.
54
÷
9
=
4.
72
÷
8
=
5.
of
60
equals
5.
36
equals
of
70
=
6.
of
42
=
of
90
=
7.
3 6 3 7 3 9
of
7.
3 6 3 7 3 9
of
27
=
8.
847
–
316
=
8.
478
–
374
=
9.
1,465
–
150
is equal to
9.
1,463
–
361
is equal to
10.
2,968
–
1,514
=
10.
2,475
–
1,314
=
6.
Friday 1.
6
x
9
=
2.
24
x
7
=
3.
42
x
6
=
4.
56
÷
8
=
5.
of
42
equals
of
28
=
7.
3 6 3 7 3 9
of
45
=
8.
893
–
712
=
9.
1,984
–
562
is equal to
10.
2,874
–
1,541
=
6.
64
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 64
Ninja challenge
Sam has 470 marbles. Cho counts back 90 from 550 and states that she has more marbles than Sam. Is Cho correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 20 Monday
Tuesday
1.
3,694
+
=
6,189
1.
6,492
+
=
9,786
2.
7,289
–
=
4,895
2.
8,386
–
=
5,692
3.
55
÷
3.
36
÷
3
=
4.
of
55
=
4.
36
=
of
55
=
5.
1 12 7 12
of
5.
1 11 7 11
of
36
=
6.
60
÷
10
=
6.
10
÷
10
=
7.
6
÷
10
=
7.
1
÷
10
=
8.
66
÷
10
=
8.
11
÷
10
=
9.
237
x
5
=
9.
473
x
7
=
10.
7
x
345
=
10.
5
x
236
=
5
=
Wednesday
Thursday
1.
4,943
+
=
8,481
1.
2,342
+
=
5,825
2.
9,281
–
=
6,843
2.
6,285
–
=
5,002
3.
45
÷
3.
108
÷
9
=
4.
of
45
=
4.
108
=
of
45
=
5.
1 12 7 12
of
5.
1 5 3 5
of
108
=
6.
90
÷
10
=
6.
30
÷
10
=
7.
9
÷
10
=
7.
3
÷
10
=
8.
99
÷
10
=
8.
33
÷
10
=
9.
543
x
9
=
9.
345
x
6
=
10.
4
x
874
=
10.
7
x
753
=
9
=
Friday 1.
3,843
+
=
9,235
2.
8,567
–
=
5,924
3.
96
÷
12
=
4.
of
96
=
5.
1 8 7 8
of
96
=
6.
50
÷
10
=
7.
5
÷
10
=
8.
55
÷
10
=
9.
234
x
6
=
10.
2
x
989
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 65
Ninja challenge
Cho multiplies 317 by 5. Cho says her answer is greater than 1,500. Is Cho correct? Explain why.
65
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 20 Monday
Tuesday
1.
=
132
÷
11
1.
=
72
÷
8
2.
=
144
÷
12
2.
=
36
÷
9
÷
9
=
÷
11
=
4.
=
180
÷
90
4.
=
140
÷
70
5.
=
10
x
1.6
5.
=
10
x
2.5
x
40
6.
2,700
=
x
90
7.
5
x
3.
108
3.
77
6.
2,400
=
7.
3
x
8.
180
=
x
36
8.
258
=
x
43
9.
263
x
=
1,052
9.
341
x
=
1,705
10.
2,429
=
x
347
10.
4,576
=
x
572
700
=
Wednesday
600
=
Thursday
1.
=
60
÷
6
1.
=
66
÷
6
2.
=
27
÷
9
2.
=
48
÷
12
÷
9
=
÷
7
=
4.
=
280
÷
70
4.
=
560
÷
70
5.
=
10
x
6.5
5.
=
10
x
7.1
x
90
6.
4,200
=
x
70
7.
9
x
3.
63
3.
35
6.
4,500
=
7.
7
x
8.
312
=
x
78
8.
348
=
x
58
9.
412
x
=
2,884
9.
541
x
=
2,164
10.
6,687
=
x
743
10.
6,760
=
x
845
400
=
Friday 1.
=
42
÷
7
2.
=
72
÷
12
÷
8
=
4.
=
480
÷
60
5.
=
10
x
5.9
x
70
3.
96
6.
6,300
=
7.
7
x
8.
258
=
x
86
9.
475
x
=
2,375
10.
8,307
=
x
923
500
66
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 66
400
=
Ninja challenge
Iko says that the total of 9,037 minus 5,649 is 3,388. Is Iko correct? Explain why.
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 21 Monday
Tuesday
1.
6
x
7
=
1.
7
x
7
=
2.
34
x
7
=
2.
23
x
9
=
3.
3 9
+
3 9
=
3.
3 9
+
5 9
=
4.
32
÷
8
=
4.
36
÷
9
=
5.
of
18
equals
5.
36
equals
of
28
=
6.
of
56
=
of
36
=
7.
4 6 5 7 6 9
of
7.
4 6 5 7 6 9
of
45
=
8.
0.1
x
10
=
8.
0.7
x
10
=
9.
853
+
395
is equal to
9.
913
+
245
is equal to
10.
2,364
–
1,152
=
10.
2,385
–
923
=
6.
Wednesday
Thursday
1.
9
x
7
=
1.
9
x
8
=
2.
36
x
6
=
2.
43
x
7
=
3.
1 9
+
2 9
=
3.
5 9
+
2 9
=
4.
42
÷
6
=
4.
28
÷
7
=
5.
of
54
equals
5.
12
equals
of
63
=
6.
of
21
=
of
72
=
7.
4 6 5 7 6 9
of
7.
4 6 5 7 6 9
of
27
=
8.
0.4
x
10
=
8.
0.9
x
10
=
9.
738
+
462
is equal to
9.
709
+
628
is equal to
10.
3,671
–
1,254
=
10.
3,572
–
1,503
=
6.
Friday 1.
5
x
8
=
2.
27
x
9
=
3.
4 9
+
4 9
=
4.
45
÷
9
=
5.
of
24
equals
of
35
=
7.
4 6 5 7 6 9
of
54
=
8.
0.2
x
10
=
9.
903
+
261
is equal to
10.
3,458
–
1,325
=
6.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 67
Ninja challenge
Sam counts back 100 from 636. Iko counts on 100 from 437. Who has more?
67
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 21 Monday
Tuesday
1.
=
3,493
+
2,384
1.
=
2,495
+
968
2.
=
6,577
–
2,393
2.
=
6,763
–
868
3.
56
÷
8
=
3.
24
÷
3
=
4.
560
÷
8
=
4.
240
÷
3
=
5.
of
560
=
5.
240
=
of
560
=
6.
1 8 5 8
of
6.
1 7 3 7
of
240
=
7.
50
÷
100
=
7.
40
÷
100
=
8.
5
÷
100
=
8.
4
÷
100
=
9.
55
÷
100
=
9.
44
÷
100
=
10.
356
x
8
=
10.
543
x
7
=
Wednesday
Thursday
1.
=
4,594
+
3,595
1.
=
4,583
+
1,483
2.
=
9,289
–
2,495
2.
=
8,266
–
2,583
3.
36
÷
4
=
3.
45
÷
9
=
4.
360
÷
4
=
4.
450
÷
9
=
5.
of
360
=
5.
450
=
of
360
=
6.
1 5 3 5
of
6.
1 9 5 9
of
450
=
7.
80
÷
100
=
7.
20
÷
100
=
8.
8
÷
100
=
8.
2
÷
100
=
9.
88
÷
100
=
9.
22
÷
100
=
10.
355
x
6
=
10.
653
x
8
=
Friday 1.
=
6,493
+
1,234
2.
=
8,327
–
5,293
3.
42
÷
6
=
4.
420
÷
6
=
5.
of
420
=
6.
1 7 3 7
of
420
=
7.
70
÷
100
=
8.
7
÷
100
=
9.
77
÷
100
=
10.
463
x
6
=
68
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 68
Ninja challenge
Tom counts on 7 lots of 1,000 from 617. What number does Tom count on to?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 21 Monday
Tuesday
1.
=
6,684
+
2,384
1.
=
3,539
+
2,384
2.
=
8,484
–
3,484
2.
=
4,505
–
2,374
+
0.2
=
+
0.7
=
4.
=
0.8
–
0.4
4.
=
0.9
–
0.4
5.
=
100
x
1.5
5.
=
100
x
1.7
÷
10
6.
5
=
÷
10
7.
9
x
80
=
=
7 9
–
of
45
=
=
7
x
606
3.
0.6
6.
3
=
7.
6
x
70
=
4 9
+
of
25
=
=
9
x
8. 9.
3 5
10.
3.
= 3 9
8. 9.
545
0.1
3 5
10.
Wednesday
3 9
Thursday
1.
=
5,394
+
3,405
1.
=
7,304
+
1,694
2.
=
6,485
–
3,139
2.
=
5,477
–
1,289
+
0.7
=
+
0.4
=
4.
=
0.2
–
0.1
4.
=
0.9
–
0.1
5.
=
100
x
0.9
5.
=
100
x
0.1
÷
10
6.
17
=
÷
10
7.
4
x
90
=
=
11 12
–
of
81
=
=
5
x
3.
0.2
6.
12
=
7.
12
x
80
=
=
9 12
–
of
42
=
=
3
x
8. 9.
3 7
10.
3.
3 12
Friday 1.
=
7,394
+
1,945
2.
=
6,412
–
1,051
+
0.6
=
4.
=
0.7
–
0.5
5.
=
100
x
1.5
÷
10
3.
0.2
6.
19
=
7.
5
x
40
=
=
11 12
–
of
48
=
=
3
x
8. 9. 10.
2 8
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 69
8. 9.
942
0.5
10.
6 9
8 12
832
Ninja challenge
Tom says that 756 is 90 more than 646. Is Tom correct? Explain why.
2 12
912 69
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 22 Monday
Tuesday
1.
5
x
8
=
1.
12
x
8
=
2.
27
x
9
=
2.
35
x
9
=
3.
6 9
–
4 9
=
3.
5 6
–
4 6
=
4.
36
÷
6
=
4.
72
÷
6
=
5.
of
24
equals
5.
35
equals
of
35
=
6.
5 7 6 9
of
6.
5 6 6 7
of
36
=
7.
9
÷
10
=
7.
7
÷
10
=
8.
0.2
x
10
=
8.
0.3
x
10
=
9.
1,903
+
1,261
is equal to
9.
1,714
+
1,532
is equal to
10.
3,594
–
1,243
=
10.
3,973
–
1,341
=
Wednesday
Thursday
1.
9
x
8
=
1.
8
x
8
=
2.
43
x
7
=
2.
52
x
6
=
3.
4 6
–
2 6
=
3.
9 12
–
7 12
=
4.
72
÷
8
=
4.
24
÷
8
=
5.
of
63
equals
5.
49
equals
of
81
=
6.
6 7 7 9
of
6.
5 7 6 9
of
27
=
7.
5
÷
10
=
7.
6
÷
10
=
8.
0.9
x
10
=
8.
0.7
x
10
=
9.
2,154
+
1,943
is equal to
9.
2,837
+
1,406
is equal to
10.
4,573
–
1,552
=
10.
3,546
–
1,292
=
Friday 1.
9
x
9
=
2.
54
x
7
=
3.
10 12
–
9 12
=
4.
36
÷
6
=
5.
of
14
equals
6.
6 7 7 9
of
18
=
7.
9
÷
10
=
8.
0.1
x
10
=
9.
4,603
+
1,592
is equal to
10.
3,168
–
2,029
=
70
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 70
Ninja challenge
Tom counts back 100 from 439. Cho counts on 100 from 229. Who has more?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 22 Monday
Tuesday
1.
=
3,542
+
897
1.
+
4,394
=
5,639
2.
=
5,239
–
2,442
2.
–
2,345
=
3,894
3.
48
÷
8
=
3.
72
÷
8
=
4.
480
÷
8
=
4.
720
÷
8
=
5.
of
480
=
5.
720
=
of
480
=
6.
1 9 5 9
of
6.
1 6 5 6
of
720
=
7.
60
÷
100
=
7.
10
÷
100
=
8.
6
÷
100
=
8.
1
÷
100
=
9.
66
÷
100
=
9.
11
÷
100
=
10.
3
x
543
=
10.
532
x
8
=
Wednesday
Thursday
1.
+
3,394
=
9,788
1.
+
2,405
=
6,998
2.
–
3,294
=
2,394
2.
–
3,293
=
4,105
3.
132
÷
12
=
3.
63
÷
9
=
4.
1,320
÷
12
=
4.
630
÷
9
=
5.
of
1,320
=
5.
630
=
of
1,320
=
6.
1 7 5 7
of
6.
1 11 6 11
of
630
=
7.
90
÷
100
=
7.
30
÷
100
=
8.
9
÷
100
=
8.
3
÷
100
=
9.
99
÷
100
=
9.
33
÷
100
=
10.
8
x
346
=
10.
447
x
8
=
Friday 1.
+
1,634
=
9,228
2.
–
6,294
=
2,204
3.
35
÷
7
=
4.
350
÷
7
=
5.
of
350
=
6.
1 5 4 5
of
350
=
7.
70
÷
100
=
8.
7
÷
100
=
9.
77
÷
100
=
10.
246
x
7
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 71
Ninja challenge
Sam divides 720 by 8. Sam states that his answer is greater than 80 and less than 100. Is Sam correct? Explain why?
71
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 22 Monday 1.
6,020
=
2.
3,556
=
9,039
3.
1.2
+
4.
1.
11,246
=
–
2.
5,847
=
9,342
–
1.6
=
3.
1.6
+
1.1
=
=
1.7
–
=
1.9
–
100
x
100
x
5.
230
=
6.
34
=
7.
6
x
8. 9.
= 6 8
10.
Tuesday +
5 12
of =
7
2,301
0.5
4. 5.
320
=
÷
10
6.
9.6
=
=
2,400
7.
7
x
+
2 12
8.
=
12
9.
x
85
10.
= 3 5
1.
10,408
=
2.
3,293
=
8,389
3.
2.6
+
4.
x
67
+
3,030
–
1.3
=
3.
2.1
+
2.5
=
=
1.7
–
=
2.7
–
100
x
100
x
6
x 11 12
of =
8
2,371
1.3
=
10
6.
17
=
÷
10
=
4,200
7.
8
x
=
6,400
–
6 12
8.
+
6 12
=
28
9.
=
12
x
79
10.
x
85
10,542
=
2.
2,451
=
5,499
–
3.
2.6
+
2.5
=
=
2.1
–
100
x
750
=
6.
35
=
7.
9
x =
+
8 12
of =
7
72
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 72
1.4
560
1.
5.
4. 5.
Friday
10.
36
9,056
7.
7 8
=
=
÷
9.
6 12
4,103
=
8.
+
2.
14
4.
3,500
–
6.
10.
=
=
=
4 5
10
10,523
=
1.8
÷
1.
+
470
9.
9
3,852
Thursday
5.
8.
5 12
of =
Wednesday
+
4,050
= 3 7
4 12
of =
9
Ninja challenge
What number does Sam multiply 600 by to get an answer of 7,200?
1.2
÷
10
=
7,200
–
6 12
=
21
x
69 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 23 Monday 1.
40
x
2.
52
3.
21 24
4. 5.
Tuesday
7
=
1.
50
x
x
6
=
2.
63
–
15 24
=
3.
18 24
360
÷
6
=
4.
of
24
equals
5.
6.
6 8 5 6
of
30
=
7.
5
÷
10
8.
600
x
9.
4,485
10.
4,267
8
=
x
7
=
–
13 24
=
720
÷
8
=
of
32
equals
6.
6 8 2 6
of
42
=
=
7.
1
÷
10
=
4
=
8.
700
x
6
=
+
1,273
is equal to
9.
4,274
+
1,832
is equal to
–
2,194
=
10.
5,361
–
2,170
=
Wednesday
Thursday
1.
70
x
8
=
1.
90
x
8
=
2.
37
x
9
=
2.
46
x
9
=
3.
18 24
–
9 24
=
3.
13 24
–
9 24
=
4.
400
÷
8
=
4.
640
÷
8
=
5.
of
56
equals
5.
64
equals
of
36
=
6.
7 8 5 6
of
6.
6 8 4 6
of
48
=
7.
9
÷
10
=
7.
8
÷
10
=
8.
900
x
6
=
8.
800
x
8
=
9.
4,472
+
1,974
is equal to
9.
5,173
+
2,103
is equal to
10.
5,372
–
2,181
=
10.
5,937
–
2,872
=
Friday 1.
70
x
8
=
2.
54
x
8
=
3.
10 24
–
9 24
=
4.
720
÷
9
=
5.
of
16
equals
6.
7 8 5 6
of
12
=
7.
3
÷
10
=
8.
900
x
9
=
9.
5,364
+
4,372
is equal to
10.
5,863
–
2,912
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 73
Ninja challenge
Sam adds 100 to 450. Tom subtracts 150 from 700. Iko adds 50 to 550. Who has more?
73
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 23 Monday
Tuesday
1.
6,978
=
+
3,483
1.
4,553
=
+
1,959
2.
4,895
=
–
2,383
2.
3,984
=
–
2,359
3.
40
÷
=
5
3.
42
÷
=
6
4.
400
÷
8
=
4.
420
÷
7
=
5.
of
400
=
5.
420
=
of
400
=
6.
1 6 5 6
of
6.
1 5 3 5
of
420
=
7.
5
÷
10
=
7.
8
÷
10
=
8.
38
÷
100
=
8.
57
÷
100
=
9.
7
÷
100
=
9.
79
÷
10
=
10.
675
x
3
=
10.
8
x
684
=
Wednesday
Thursday
1.
4,168
=
+
1,685
1.
6,875
=
+
2,382
2.
6,985
=
–
1,283
2.
4,982
=
–
2,393
3.
32
÷
=
8
3.
36
÷
=
4
4.
320
÷
4.
360
÷
9
=
5.
of
320
=
5.
360
=
of
320
=
6.
1 4 3 4
of
6.
1 8 3 8
of
360
=
7.
9
÷
100
=
7.
75
÷
10
=
8.
70
÷
100
=
8.
9
÷
100
=
9.
93
÷
10
=
9.
80
÷
10
=
10.
754
x
6
=
10.
834
x
9
=
4
=
Friday 1.
5,089
=
+
1,495
2.
1,995
=
–
4,294
3.
72
÷
=
8
4.
720
÷
9
=
5.
of
720
=
6.
1 8 3 8
of
720
=
7.
93
÷
10
=
8.
4
÷
100
=
9.
79
÷
100
=
10.
6
x
865
=
74
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 74
Ninja challenge
Sam subtracts 1,238 from 7,371. What answer does Sam get?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 23 Monday
Tuesday
1.
10,469
=
7,380
add
1.
11,975
=
8,480
add
2.
2,004
=
7,085
take away
2.
3,246
=
8,084
take away
3.
plus
2.5
=
4.6
3.
plus
2.7
=
6.1
4.
minus
1.0
=
1.1
4.
minus
2.6
=
1.9
5.
equals
420
÷
7
5.
equals
490
÷
7
÷
100
6.
0.48
=
÷
100
=
3,600
7.
6
groups of
=
5,400
is equal to
13 16
8.
–
is equal to
7 16
of
24
9.
=
8 16 5 7
of
28
times
609
10.
=
8
times
714
6.
0.89
=
7.
6
groups of
8.
+
9.
=
8 16 5 8
10.
=
6
Wednesday
Thursday
1.
11,942
=
9,004
add
1.
13,485
=
8,904
add
2.
2,666
=
8,048
take away
2.
2,878
=
9,809
take away
3.
plus
3.8
=
8.3
3.
plus
3.5
=
9.3
4.
minus
1.9
=
4.3
4.
minus
3.4
=
3.8
5.
equals
350
÷
7
5.
equals
480
÷
6
6.
0.96
=
÷
100
6.
0.76
=
÷
100
7.
9
groups of
=
4,500
7.
8
groups of
=
5,600
is equal to
4 16
8.
–
is equal to
7 19
of
49
9.
=
11 19 6 9
of
45
times
939
10.
=
5
times
515
8.
–
9.
=
9 16 6 7
10.
=
9
Ninja challenge
Friday 1.
10,492
=
9,283
add
2.
1,444
=
9,384
take away
3.
plus
2.8
=
9.3
4.
minus
5.7
=
2.8
5.
equals
720
÷
6
÷
100
=
1,600
is equal to
1 19
of
18
times
439
6.
0.89
=
7.
8
groups of
8.
–
9.
=
14 19 8 9
10.
=
8
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 75
Sam multiplies the product of 7 times 9 by 8. What answer does Sam have?
75
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 24 Monday
Tuesday
1.
60
multiplied by
6
=
1.
80
multiplied by
6
=
2.
27
x
9
is equal to
2.
46
x
6
is equal to
3.
10 17
–
7 17
=
3.
11 17
–
3 17
=
4.
630
divided by
9
=
4.
540
divided by
9
=
5.
of
36
equals
5.
24
equals
of
108
=
6.
3 12 5 9
of
6.
7 12 5 9
of
27
=
7.
0.4
x
10
=
7.
0.5
x
10
=
8.
900
times
9
=
8.
300
times
6
=
9.
901
+
100
is equal to
9.
910
+
100
is equal to
10.
1,001
–
100
=
10.
1,101
–
100
=
1.
70
multiplied by
6
=
1.
90
multiplied by
6
=
2.
39
x
6
is equal to
2.
54
x
7
is equal to
3.
12 17
+
3 17
=
3.
10 17
+
4 17
=
4.
400
divided by
8
=
4.
630
divided by
9
=
5.
of
36
equals
5.
48
equals
of
36
=
6.
8 12 3 9
of
6.
7 12 8 9
of
54
=
7.
0.7
x
10
=
7.
0.9
x
10
=
8.
700
times
6
=
8.
800
times
9
=
9.
991
+
100
is equal to
9.
911
+
100
is equal to
10.
1,011
–
100
=
10.
1,110
–
100
=
Wednesday
Thursday
Friday 1.
70
multiplied by
6
=
2.
64
x
9
is equal to
3.
1 17
+
4 17
=
4.
360
divided by
9
=
5.
of
24
equals
6.
11 12 7 9
of
72
=
7.
0.1
x
10
=
8.
600
times
9
=
9.
910
+
100
is equal to
10.
1,001
–
100
=
76
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 76
Ninja challenge
Tom says half of 100 is greater than a quarter of 200. Is Tom correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 24 Monday
Tuesday
1.
7,887
=
+
3,294
1.
7,978
=
+
2,485
2.
6,893
=
–
1,394
2.
7,093
=
–
1,285
3.
63
÷
=
7
3.
56
÷
=
7
4.
630
÷
9
=
4.
560
÷
8
=
5.
of
630
=
5.
560
=
of
630
=
6.
1 7 3 7
of
6.
1 7 3 7
of
560
=
7.
56
÷
10
=
7.
52
÷
10
=
8.
3
÷
100
=
8.
3
÷
100
=
9.
7
÷
10
=
9.
79
÷
100
=
10.
789
x
9
=
10.
5
x
345
=
Wednesday
Thursday
1.
5,383
=
+
989
1.
5,626
=
+
1,244
2.
3,889
=
–
2,394
2.
4,082
=
–
2,344
3.
24
÷
=
3
3.
18
÷
=
3
4.
240
÷
4.
180
÷
6
=
5.
of
240
=
5.
180
=
of
240
=
6.
1 3 2 3
of
6.
1 3 2 3
of
180
=
7.
90
÷
10
=
7.
53
÷
10
=
8.
8
÷
100
=
8.
3
÷
100
=
9.
76
÷
100
=
9.
75
÷
100
=
10.
3
x
543
=
10.
787
x
6
=
8
=
Friday 1.
6,777
=
+
1,384
2.
4,084
=
–
2,393
3.
18
÷
=
9
4.
180
÷
2
=
5.
of
180
=
6.
1 9 5 9
of
180
=
7.
62
÷
100
=
8.
3
÷
10
=
9.
34
÷
10
=
10.
8
x
345
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 77
Ninja challenge
Cho explained how 8 groups of 50 is equal to 40 groups of 10. Is Cho correct? Explain why.
77
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 24 Monday 1.
more than less than
8,485
1.
7,483
2.8
=
5.7 180
=
3,485
2.
=
2,384
3. 4.
more than less than
5.
equals
6. 7.
690
=
8
multiplied by
8. 9.
69
10.
Tuesday 7,904
4,271
more than less than
2.9
=
5.8
6.2
=
1.5
240
÷
8
=
4,532
2.
=
5.1
3.
=
1.2
4.
more than less than
÷
6
5.
equals
x
100
6.
=
2,400
7.
7
8.
÷
8
=
÷
3
=
=
76
÷
9. 10
5,472
740
=
x
100
8
multiplied by
=
4,800 7
96
10.
Wednesday
÷
9
=
÷
3
=
=
94
÷
10
8,305
Thursday
1.
=
5,832
2.
=
3,842
3.
3.6
=
7.1
3.
4.
more than less than
more than less than
8,049
1.
=
4,948
8,491
2.
=
5,067
more than less than
8.1
=
2.4
4.
more than less than
4.5
=
8.2
8.3
=
2.4
5.
equals
630
÷
9
5.
equals
560
÷
8
9,045
6.
830
=
x
100
6.
160
=
x
100
7.
7
multiplied by
=
2,800
7.
9
multiplied by
=
3,600
6
8.
5
8. 9.
92
10.
÷
8
=
÷
4
=
=
83
÷
9. 10
Friday =
5,007
2.
=
1,594
3.
3.8
=
10.7
4.
more than less than
more than less than
9.4
=
4.9
5.
equals
450
÷
9
1.
6. 7.
10.
5,682
730
=
x
100
6
multiplied by
=
3,000 8
8. 9.
6,940
144
÷
8
=
÷
4
=
=
75
÷
78
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 78
10.
128
÷
9
=
÷
4
=
=
63
÷
10
Ninja challenge
Cho has an answer of 540. If Cho has 90 equal groups, what is each equal group made up of?
10 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 25 Monday
Tuesday
1.
40
multiplied by
6
=
1.
50
multiplied by
9
=
2.
23
x
6
is equal to
2.
52
x
7
is equal to
3.
5 11
+
4 11
=
3.
6 11
–
=
6,491
=
4.
1,000
less than
4 11
1,401
=
4.
1,000
less than
5.
36
divided by
9
=
5.
72
divided by
8
=
6.
5 6
of
42
=
6.
5 6
of
60
=
7.
42
÷
10
=
7.
17
÷
10
=
8.
60
times
9
=
8.
90
times
9
=
9.
1,000 + 300 +
40
+6
is equal to
9.
1,000 + 400 +
90
+7
is equal to
10.
2,000 +
500
+ 50 + 4
=
10.
2,000 +
100
+ 20 + 1
=
1.
60
multiplied by
9
=
1.
70
multiplied by
9
=
2.
27
x
9
is equal to
2.
38
x
9
is equal to
3.
9 11
–
=
3.
10 15
–
4.
1,000
5,374
=
4.
1,000
less than
5 15
=
less than
5 11
6,172
=
5.
55
divided by
11
=
5.
64
divided by
8
=
6.
5 7
of
28
=
6.
3 7
of
42
=
7.
23
÷
10
=
7.
32
÷
10
=
8.
40
times
9
=
8.
60
times
7
=
9.
1,000 + 900 +
10
+4
is equal to
9.
1,000 + 300 +
50
+9
is equal to
10.
2,000 +
300
+ 60 + 7
=
10.
2,000 +
400
+ 80 + 4
=
Wednesday
Thursday
Friday 1.
60
multiplied by
6
=
2.
43
x
6
is equal to
3.
9 15
–
6 15
=
8,374
=
4.
1,000
less than
5.
42
divided by
6
=
6.
3 9
of
27
=
7.
46
÷
10
=
8.
90
times
7
=
9.
1,000 + 500 +
10
+2
is equal to
10.
2,000 +
900
+ 90 + 2
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 79
Ninja challenge
Tom totals 9 groups of 3. Sam totals 7 groups of 4. Sam says that his total is greater than Tom’s. Is Sam correct? Explain why.
79
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 25 Monday
Tuesday
1.
7,947
=
+
2,454
1.
7,078
=
+
2,485
2.
7,053
=
–
1,293
2.
5,793
=
–
2,585
3.
12
÷
=
2
3.
16
÷
=
8
4.
120
÷
6
=
4.
160
÷
2
=
5.
1,200
÷
6
=
5.
1,600
÷
2
=
6.
1 2
of
1,200
=
6.
1 8
of
1,600
=
7.
59
÷
10
=
7.
52
÷
100
=
8.
9
÷
100
=
8.
7
÷
10
=
9.
75
÷
100
=
9.
37
÷
10
=
10.
743
x
3
=
10.
6
x
235
=
Wednesday
Thursday
1.
6,987
=
+
2,394
1.
5,862
=
+
1,359
2.
4,894
=
–
2,393
2.
4,059
=
–
2,303
3.
28
÷
=
7
3.
48
÷
=
8
4.
280
÷
4
=
4.
480
÷
6
=
5.
2,800
÷
4
=
5.
4,800
÷
6
=
6.
1 7
of
2,800
=
6.
1 8
of
4,800
=
7.
4
÷
100
=
7.
4
÷
100
=
8.
9
÷
10
=
8.
93
÷
100
=
9.
45
÷
10
=
9.
6
÷
10
=
10.
3
x
567
=
10.
5
x
335
=
Friday 1.
6,094
=
+
2,499
2.
4,909
=
–
2,295
3.
54
÷
=
6
4.
540
÷
9
=
5.
5,400
÷
9
=
6.
1 6
of
5,400
=
7.
6
÷
10
=
8.
93
÷
100
=
9.
7
÷
100
=
10.
523
x
7
=
80
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 80
Ninja challenge
Cho says that the difference between 9,362 and 2,005 is 7,375. Is Cho correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 25 Monday
Tuesday more than less than
1.
11,426
2.
5,798
=
3.
3.4
7.1
4.
7.6
more than less than
equals
6.
=
7.
multiplied by
300
=
÷
100
=
÷
100
=
=
75
÷
5. 7
8. 9.
6
10.
= 2,007
7,042
=
1.
11,426
2.
5,798
=
4,896
3.
5.4
8.5
=
5.6
more than less than
more than less than
equals
=
1.3
4.
45
÷
9
5.
2.1
x
100
6. 7.
0.64
8. 9.
100
7 9
10.
Wednesday 1.
14,726
=
2.
5,644
=
3,532
3.
6.7
9.7
=
4.
7.5
more than less than
5.
equals
6. 5
8. 9.
16
10.
8,562
7.9
x
100
600
=
÷
100
=
÷
100
=
=
16
÷
100
9,105
1.
14,930
=
2.
1,297
=
8,305
3.
6.4
8.4
=
8.1
more than less than
more than less than
5.
equals
=
9.1
x
100
6.
multiplied by
600
=
÷
100
=
÷
100
=
=
6
÷
3,580
=
4,905
3.
7.4
6.9
=
4.
4.5
more than less than
equals
6. 7.
10.
= multiplied by
6
2.
76
8
÷
16,309
9.
÷
48
1.
8.
72
4.
more than less than
7
3.6
1.6
7. 0.85 100
9,928
=
4.6
44
÷
4
=
8.9
x
100
multiplied by
900
=
÷
100
=
÷
100
=
=
5
÷
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 81
5
8. 9.
Friday
5.
=
=
=
6,829
0.78
Thursday more than less than
7.
=
10.
65
=
1.5
32
÷
8
=
4.6
x
100
multiplied by
900
=
÷
100
=
÷
100
=
=
17
÷
1.26 100
Ninja challenge
Cho says that 8,384 less than 9,283 equals 988. Is Cho correct? Explain why
1.41 100 81
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 26 Monday
Tuesday
1.
6
groups of
6
=
1.
8
groups of
6
=
2.
26
x
6
is equal to
2.
45
x
6
is equal to
3.
9 15
–
6 15
=
3.
14 15
–
=
8,362
=
4.
1,000
more than
8 15
364
=
4.
1,000
more than
5.
48
shared by
6
=
5.
72
shared by
8
=
6.
3 5
of
45
=
6.
4 6
of
30
=
7.
30
÷
10
=
7.
40
÷
10
=
8.
2.1
times
10
=
8.
1.1
times
10
=
9.
1,000 + 600 +
+2
is equal to
1,612
9.
1,000 + 400 +
+3
is equal to
1,463
10.
2,000 +
+ 70 + 5
=
2,975
10.
2,000 +
+ 60 + 3
=
2,463
Wednesday
Thursday
1.
9
groups of
4
=
1.
9
groups of
9
=
2.
48
x
6
is equal to
2.
56
x
7
is equal to
3.
11 13
–
4 13
=
3.
9 13
+
=
1,374
=
4.
1,000
more than
3 13
2,983
=
8
=
5.
48
shared by
8
=
of
24
=
4.
1,000
more than
5.
32
shared by
6.
5 6
of
54
=
6.
5 8
7.
50
÷
10
=
7.
70
÷
10
=
8.
1.2
times
10
=
8.
3.5
times
10
=
9.
2,000 + 300 +
+5
is equal to
2,305
9.
2,000 + 900 +
+6
is equal to
2,916
10.
3,000 +
+ 70 + 4
=
3,974
10.
4,000 +
+ 60 + 1
=
4,461
Ninja challenge
Friday 1.
6
groups of
9
=
2.
62
x
9
is equal to
3.
6 13
+
6 13
=
5,371
=
Cho counts on 1,000 from 104. What number does Cho count on to?
4.
1,000
more than
5.
49
shared by
7
=
6.
7 8
of
32
=
7.
10
÷
10
=
8.
2.1
times
10
=
9.
3,000 + 100 +
+6
is equal to
3,136
10.
4,000 +
+ 60 + 4
=
4,664
82
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 82
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 26 Monday
Tuesday
1.
0.3
+
0.5
=
1.
0.6
+
0.3
=
2.
3.3
+
0.5
=
2.
2.6
+
0.3
=
3.
3.6
+
0.5
=
3.
2.6
+
0.7
=
4.
of
40
=
4.
42
=
of
400
=
5.
of
420
=
of
4,000
=
6.
1 6 1 6 1 6
of
6.
1 5 1 5 1 5
of
4,200
=
7.
92
÷
2
=
7.
92
÷
4
=
8.
94
÷
2
=
8.
96
÷
4
=
9.
3 5
+
4 5 4 5
9.
7 12
+
6 12 9 12
=
5.
10.
=
= +
4 5
10.
=
Wednesday
+
Thursday
1.
0.5
+
0.4
=
1.
0.3
+
0.5
=
2.
10.5
+
0.4
=
2.
3.3
+
0.5
=
3.
10.6
+
0.5
=
3.
3.3
+
0.9
=
4.
of
56
=
4.
35
=
of
560
=
5.
of
350
=
of
5,600
=
6.
1 5 1 5 1 5
of
6.
1 7 1 7 1 7
of
3,500
=
7.
95
÷
5
=
7.
84
÷
6
=
8.
85
÷
5
=
8.
96
÷
6
=
9.
11 15
+
7 15 9 15
9.
9 20
+
18 20 11 20
=
5.
10.
=
= +
8 15
1.
0.4
+
0.3
=
2.
12.4
+
0.3
=
3.
12.4
+
0.9
=
4.
of
72
=
of
720
=
6.
1 12 1 12 1 12
of
7,200
=
7.
87
÷
3
=
8.
93
÷
3
=
9.
11 18
+
13 18 13 18
=
10.
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 83
+
10.
=
+
16 20
Ninja challenge
Friday
5.
8 12
Sam shares 96 into 4 equal groups. How much will Sam have in each group?
12 18 83
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 26 Monday 1.
9,528
=
Tuesday more than less than
9,128
1.
13,374
2.
=
4,085
1,000
more than less than
15,083
8.7
=
14.6
11.4
=
3.9
=
3,485
2.
=
3.
9.4
=
15.7
3.
4.
more than less than
9.2
=
2.7
4.
more than less than
5.
equals
48
÷
6
5.
equals
27
÷
9
6.
=
14
x
100
6.
=
34
x
100
7.
multiplied by
900
is equal to
7.
multiplied by
900
is equal to
8.
÷
100
=
1.41
8.
÷
100
=
2.05
9.
x
100
equals
160
9.
x
100
equals
270
10.
x
100
=
5
10.
x
100
=
9
3,932 12,811
6
1,000
5
Wednesday
Thursday
2.
=
1,000
3.
9.8
=
16.5
3.
4.
more than less than
more than less than
12.6
=
3.1
4.
more than less than
5.
equals
45
÷
9
5.
equals
21
÷
3
6.
=
52
x
100
6.
=
56
x
100
multiplied by
900
is equal to
multiplied by
700
is equal to
8.
÷
100
=
3.17
8.
÷
100
=
2.99
9.
x
100
equals
420
9.
x
100
equals
940
10.
x
100
=
12
10.
x
100
=
5
1.
7.
3,284
9
=
2,384
1.
10,204
2.
=
1,000
more than less than
10.4
=
20.2
13.1
=
2.6
7.
Friday 2.
=
1,000
3.
9.9
=
17.7
4.
more than less than
more than less than
14.1
=
1.5
5.
equals
49
÷
7
6.
=
79
x
100
7.
multiplied by
900
is equal to
8.
÷
100
=
3.02
9.
x
100
equals
740
10.
x
100
=
45
1.
5,691
6
=
84
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 84
4,891 14,062
4,632
6
=
Ninja challenge
Cho adds an unknown number to 4,001 and gets an answer of 8,909. What is Cho’s unknown number?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 27 Monday
Tuesday
1.
60
groups of
9
=
1.
40
groups of
6
=
2.
16
x
9
is equal to
2.
23
x
8
is equal to
3.
1 13
+
6 13
=
3.
5 14
+
=
5,737
=
4.
100
less than
6 14
1,305
=
4.
100
less than
5.
490
shared by
7
=
5.
360
shared by
9
=
6.
3 4
of
32
=
6.
3 4
of
16
=
7.
73
÷
10
=
7.
83
÷
10
=
8.
4.1
times
10
=
8.
4.3
times
10
=
+ 200 + 30
+6
is equal to
3,236
9.
+ 400 + 20
+5
is equal to
2,425
+4
=
954
10.
+3
=
823
9. 10.
900 +
800 +
Wednesday
Thursday
1.
60
groups of
6
=
1.
40
groups of
7
=
2.
43
x
9
is equal to
2.
49
x
9
is equal to
3.
1 14
+
=
3.
6 10
+
4.
100
1,034
=
4.
100
less than
3 10
=
less than
3 14
2,103
=
5.
450
shared by
5
=
5.
270
shared by
3
=
6.
3 5
of
35
=
6.
4 5
of
60
=
7.
32
÷
10
=
7.
11
÷
10
=
8.
7.1
times
10
=
8.
1.2
times
10
=
+ 500 + 40
+3
is equal to
1,543
9.
+ 300 + 20
+9
is equal to
6,329
+1
=
371
10.
+4
=
984
9. 10.
300 +
Ninja challenge
Friday 1.
40
groups of
8
=
2.
52
x
7
is equal to
3.
5 10
–
3 10
=
3,576
=
Cho counts back 100 from 1,002. What number does Cho count back to?
4.
100
less than
5.
500
shared by
5
=
6.
4 6
of
42
=
7.
18
÷
10
=
8.
1.9
times
10
=
+ 400 + 30
+7
is equal to
7,437
+7
=
547
9. 10.
500 +
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 85
900 +
85
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 27 Monday
Tuesday
1.
0.1
+
0.4
=
1.
0.8
+
0.1
=
2.
3.1
+
0.4
=
2.
7.8
+
0.1
=
3.
3.9
+
0.4
=
3.
7.8
+
0.4
=
4.
of
44
=
4.
56
=
of
440
=
5.
of
560
=
of
4,400
=
6.
1 7 1 7 1 7
of
6.
1 11 1 11 1 11
of
5,600
=
7.
98
÷
7
=
7.
84
÷
4
=
8.
96
÷
4
=
8.
95
÷
5
=
9.
4 12
+
10 12 8 10
9.
12 15
+
9 15 12 15
=
5.
10.
=
= +
4 10
10.
=
Wednesday
+
Thursday
1.
0.3
+
0.3
=
1.
0.7
+
0.2
=
2.
8.3
+
0.3
=
2.
4.7
+
0.2
=
3.
8.9
+
0.3
=
3.
4.7
+
0.8
=
4.
of
35
=
4.
18
=
of
350
=
5.
of
180
=
of
3,500
=
6.
1 9 1 9 1 9
of
6.
1 5 1 5 1 5
of
1,800
=
7.
92
÷
4
=
7.
78
÷
3
=
8.
51
÷
3
=
8.
56
÷
4
=
9.
7 8
+
5 8 8 9
9.
7 15
+
9 15 13 20
=
5.
10.
=
= +
5 9
1.
0.6
+
0.2
=
2.
2.6
+
0.2
=
3.
2.6
+
0.9
=
4.
of
24
=
of
240
=
6.
1 3 1 3 1 3
of
2,400
=
7.
96
÷
4
=
8.
90
÷
6
=
9.
17 25
+
10 25 11 12
=
10.
=
86
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 86
+
10.
=
+
15 20
Ninja challenge
Friday
5.
10 15
Sam says that 2.7 minus 1.4 is equal to 1.3. Is Sam correct? Explain why.
7 12 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 27 Monday
Tuesday
1.
16,196
=
+
7,492
1.
17,553
=
+
7,823
2.
973
=
–
5,432
2.
4,213
=
–
5,432
3.
9.85
plus
=
15.27
3.
8.65
plus
=
10.99
4.
12.67 minus
=
1.22
4.
9.86
minus
=
5.3
5.
equals
49
x
7
5.
6.
=
143
x
5
7.
6
multiplied by
8.
102
÷
3
9.
104
÷
10.
192
÷
equals
76
x
6
6.
=
454
x
4
7.
7
multiplied by
is equal to
5,600
=
8.
117
÷
3
=
4
equals
9.
168
÷
4
equals
6
=
10.
222
÷
6
=
is equal to
3,000
Wednesday
Thursday
1.
13,735
=
+
6,007
1.
15,904
=
+
7,835
2.
5,852
=
–
3,605
2.
3,044
=
–
6,826
3.
9.67
plus
=
15.28
3.
8.67
plus
=
15.79
4.
9.06
minus
=
5.89
4.
9.67
minus
=
2.81
5.
equals
85
x
7
5.
equals
86
x
6
6.
=
607
x
6
6.
=
673
x
8
is equal to
7,200
7.
7
multiplied by
is equal to
4,200
7.
9
multiplied by
8.
129
÷
3
=
8.
162
÷
3
=
9.
180
÷
4
equals
9.
208
÷
4
equals
10.
234
÷
6
=
10.
264
÷
6
=
Friday 1.
18,254
=
+
9,083
2.
1,076
=
–
8,905
3.
9.54
plus
=
16.25
4.
11.45 minus
=
5.32
5.
equals
95
x
7
6.
=
716
x
6
7.
9
multiplied by
is equal to
5,400
8.
171
÷
3
=
9.
196
÷
4
equals
10.
372
÷
6
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 87
Ninja challenge
The answer to the question is 5. To get to the answer, Sam halved a number, then divided it by 6 and then took away 22. What number did Sam start with?
87
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 28 Monday
Tuesday
1.
9
multiplied by
9
=
1.
8
multiplied by
7
=
2.
19
times
7
is equal to
2.
23
times
9
is equal to
3.
15 16
take away
3 16
=
3.
12 16
take away
=
3,576
=
4.
10
more than
3 16
1,226
=
4.
10
more than
5.
72
shared by
8
=
5.
64
shared by
8
=
6.
4 5
of
45
=
6.
5 6
of
48
=
7.
23
÷
10
=
7.
17
÷
10
=
8.
4.2
x
10
=
8.
3.5
x
10
=
9.
7,000 +
600 + 50 +
200 + 30 +
10.
2,000 +
+ 60 + 7
is equal to
7,657
9.
4,000 +
=
2,167
10.
3,000 +
Wednesday
+ 60 + 1
is equal to
4,235
=
3,461
Thursday
1.
9
multiplied by
2.
32
times
8
is equal to
2.
43
times
9
is equal to
3.
9 16
take away
8 16
=
3.
11 16
take away
=
2,364
=
4.
10
more than
8 16
3,205
=
8
=
5.
40
shared by
8
=
of
36
=
6
=
1.
7
multiplied by
6
=
4.
10
more than
5.
96
shared by
6.
5 9
of
27
=
6.
7 9
7.
19
÷
10
=
7.
21
÷
10
=
8.
4.1
x
10
=
8.
5.1
x
10
=
9.
5,000 +
300 + 20 +
400 + 90 +
10.
6,000 +
+ 10 + 2
is equal to
5,321
9.
3,000 +
=
6,912
10.
3,000 +
5
multiplied by
6
=
2.
56
times
7
is equal to
3.
6 16
take away
5 16
=
892
=
4.
10
more than
5.
63
shared by
9
=
6.
8 9
of
45
=
7.
8
÷
10
=
8.
0.7
x
10
=
9.
4,000 +
200 + 90 +
10.
2,000 +
+ 90 + 7
88
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 88
3,491
=
3,577
Ninja challenge
Friday 1.
+ 70 + 7
is equal to
Tom totals 9 groups of 4. Sam totals 6 groups of 6. Sam says that his total is greater than Tom’s. Is Sam correct? Explain why.
is equal to
4,294
=
2,497 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 28 Monday
Tuesday
1.
0.8
–
0.3
=
1.
0.6
–
0.2
=
2.
3.8
–
0.3
=
2.
6.6
–
0.2
=
3.
3.8
–
0.9
=
3.
6.6
–
0.7
=
4.
of
32
=
4.
24
=
of
320
=
5.
of
240
=
of
3,200
=
6.
1 2 1 2 1 2
of
6.
1 8 1 8 1 8
of
2,400
=
7.
75
÷
5
=
7.
81
÷
3
=
8.
63
÷
3
=
8.
76
÷
4
=
9.
13 5
–
4 5 15 9
9.
16 10
–
7 10 13 9
=
5.
10.
=
= –
3 9
10.
=
Wednesday
–
Thursday
1.
0.4
–
0.3
=
1.
0.5
–
0.3
=
2.
5.4
–
0.3
=
2.
8.5
–
0.3
=
3.
5.4
–
0.8
=
3.
8.5
–
0.8
=
4.
of
72
=
4.
27
=
of
720
=
5.
of
270
=
of
7,200
=
6.
1 9 1 9 1 9
of
6.
1 6 1 6 1 6
of
2,700
=
7.
96
÷
3
=
7.
70
÷
5
=
8.
90
÷
5
=
8.
45
÷
3
=
9.
7 5
–
4 5 12 7
9.
25 20
–
6 20 11 8
=
5.
10.
=
= –
4 7
1.
0.6
–
0.5
=
2.
9.6
–
0.5
=
3.
9.6
–
0.8
=
4.
of
28
=
of
280
=
6.
1 7 1 7 1 7
of
2,800
=
7.
68
÷
4
=
8.
65
÷
5
=
9.
19 9
–
8 9 13 8
=
10.
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 89
–
10.
=
–
6 8
Ninja challenge
Friday
5.
2 9
Tom says that there are 5 hundreds in the number 15,355. Is Tom correct? Explain why.
4 8 89
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 28 Monday
Tuesday
1.
13,688
=
8,304
+
1.
15,305
=
8,679
+
2.
8,210
=
11,363
–
2.
8,881
=
12,045
–
3.
9.37
+
=
16.07
3.
11.53
+
=
20.93
4.
9.62
–
=
3.52
4.
11.67
–
=
2.57
5.
2 6
of
=
22
5.
5 7
of
=
30
6.
=
x
9
6.
=
x
8
7.
3
7.
7
multiplied by
is equal to
1,400
8.
2 6
multiplied by
9. 10.
507
is equal to
1,800
+
5 6
=
8.
4 6
204
÷
6
equals
9.
270
÷
5
=
10.
69
+
5 6
=
270
÷
6
equals
255
÷
5
=
Wednesday
Thursday
1.
16,952
=
9,047
+
1.
17,838
=
9,367
+
2.
11,142
=
13,274
–
2.
8,192
=
14,035
–
3.
12.04
+
=
16.84
3.
13.38
+
=
19.28
4.
13.98
–
=
9.38
4.
15.34
–
=
7.74
5.
6 9
8 9
of
=
24
x
9
is equal to
4,200
6.
of =
7.
9
8.
6 8
9. 10.
582
multiplied by
=
36
5.
x
9
6.
is equal to
8,100
7.
6
=
+
5 8
=
8.
7 9
378
÷
6
equals
9.
360
÷
5
=
10.
1.
18,018
=
9,846
+
2.
6,936
=
13,783
–
3.
14.05
+
=
20.25
4.
12.54
–
=
3.24
5.
2 9
of
=
8
6.
=
x
9
7.
9
is equal to
6,300
8.
8 9
multiplied by
9. 10.
+
3 9
=
438
÷
6
equals
420
÷
5
=
90
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 90
multiplied by
+
8 9
=
402
÷
6
equals
375
÷
5
=
Ninja challenge
Friday
89
496
Sam doubles 800 and then quarters the answer. What number does Sam finish with?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 29 Monday
Tuesday
1.
5
multiplied by
6
=
1.
8
multiplied by
6
=
2.
56
times
7
is equal to
2.
62
times
9
is equal to
3.
6 16
1 16
=
3.
7 16
=
10
892
is equal to
4.
10
more than less than
5 16
4.
more than less than
315
is equal to
5.
54
shared by
9
=
5.
54
shared by
6
=
6.
2 9
of
27
=
6.
3 9
of
36
=
more than less than
1,373
=
1,521
=
7.
264
8.
173
9.
4,000 +
more than less than
1,364
=
7.
152
1,582
=
8.
534
+ 90 + 4 is equal to 4,294
9.
3,000 +
=
10.
+ 500
8
=
+ 60 + 4 is equal to 3,564
10.
+ 400
1.
9
multiplied by
5
=
1.
9
multiplied by
2.
58
times
6
is equal to
2.
63
times
7
is equal to
3.
6 19
5 19
=
3.
7 19
=
10
571
is equal to
4.
10
more than less than
6 19
4.
more than less than
623
is equal to
5.
49
shared by
7
=
5.
56
shared by
8
=
6.
7 9
of
18
=
7.
132
1,578
=
8.
629
more than less than
1,251
=
9.
5,000 +
+ 90 + 7
2,497
Wednesday
10.
of
45
=
6.
more than less than
1,429
=
7.
432
1,379
=
8.
418
+ 70 + 3 is equal to 5,273
9.
3,000 +
=
10.
+ 20 + 1
3,921
1.
7
multiplied by
8
=
2.
72
times
8
is equal to
3.
10 19
6 19
=
4.
10
more than less than
516
is equal to
5.
36
shared by
9
=
6.
3 7
of
28
=
more than less than
1,947
=
1,162
=
562
8.
782
9.
4,000 +
10.
1,552
+ 40 + 2 is equal to 3,842
+ 200
+ 60 + 5
=
5,265
Ninja challenge
Friday
7.
=
Thursday
8 9
+ 900
+ 50 + 2
Cho counts back 400 from 1,304. What number does Cho count back to?
+ 70 + 3 is equal to 4,373
+ 200
+ 70 + 5
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 91
=
9,275 91
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 29 Monday
Tuesday
1.
0.5
–
0.2
=
1.
0.7
–
0.5
=
2.
9.5
–
0.2
=
2.
12.7
–
0.5
=
3.
9.5
–
0.8
=
3.
12.7
–
0.8
=
4.
of
40
=
4.
48
=
of
400
=
5.
of
480
=
of
4,000
=
6.
1 8 1 8 1 8
of
6.
1 10 1 10 1 10
of
4,800
=
7.
72
÷
4
=
7.
84
÷
6
=
8.
42
÷
3
=
8.
87
÷
3
=
9.
12 7
–
3 7 9 5
9.
15 11
–
7 11 10 7
=
5.
10.
=
= –
7 5
10.
=
Wednesday
Thursday
1.
0.5
–
0.1
=
1.
0.5
–
0.3
=
2.
10.5
–
0.1
=
2.
15.5
–
0.3
=
3.
10.5
–
0.8
=
3.
15.5
–
0.9
=
4.
of
45
=
4.
44
=
of
450
=
5.
of
440
=
of
4,500
=
6.
1 4 1 4 1 4
of
6.
1 5 1 5 1 5
of
4,400
=
7.
64
÷
4
=
7.
84
÷
3
=
8.
91
÷
7
=
8.
80
÷
5
=
9.
36 27
–
8 27 35 20
9.
50 45
–
9 45 16 13
=
5.
10.
=
= –
25 20
1.
0.6
–
0.4
=
2.
6.6
–
0.4
=
3.
6.6
–
0.9
=
4.
of
40
=
of
400
=
6.
1 8 1 8 1 8
of
4,000
=
7.
78
÷
6
=
8.
57
÷
3
=
9.
11 3
–
4 3 18 7
=
10.
=
92
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 92
–
10.
=
–
7 13
Ninja challenge
Friday
5.
2 7
–
Iko says that one quarter of 240 is equal to 30 x 3. Is Iko correct? Explain why.
4 7 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 29 Monday
Tuesday
1.
=
8,384
+
400
1.
=
7,583
+
600
2.
=
9,394
–
700
2.
=
8,283
–
800
3.
14.05
+
=
20.05
3.
9.36
+
=
12.36
4.
12.54
–
=
5.54
4.
11.35
–
=
6.35
5.
42
=
7 9
of
5.
21
=
7 12
of
6.
=
67
x
6.
=
78
x
8
7.
9
7.
6
540
8.
8.
7 9
multiplied by
is equal to
8 9
multiplied by
9. 10.
252
is equal to
–
3 9 6 9
equals
÷
7
=
+
6 630
= 8 9
9. 10.
315
Wednesday
–
7 9 9 9
equals
÷
7
=
+
= 2 9
Thursday
1.
=
5,384
+
900
1.
=
6,904
+
700
2.
=
4,183
–
600
2.
=
5,192
–
900
=
13.57
3.
3.12
+
=
11.12
=
4.51
4.
11.45
–
=
2.45
3.
4.57
+
4.
10.51
– =
7 8
of
6.
=
99
x
7.
8
8.
7 5
multiplied by
5.
21
9. 10.
371
is equal to
–
2 5 11 9
equals
÷
7
=
+
8 720 4 9
1.
=
5,724
+
800
2.
=
10,034
–
800
3.
4.57
+
=
10.57
4.
9.04
–
=
7.04
5.
45
=
5 9
of
6.
=
749
x
3
7.
9
is equal to
270
8.
6 5
multiplied by
9. 10.
476
–
equals
÷
7
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 93
6.
=
901
x
6
7.
7
is equal to
490
8.
9 5
multiplied by
45
9. 10.
Friday
+
of
5.
=
6 5 15 18
=
5 6
434
–
2 5 10 12
equals
÷
7
=
+
= 9 12
Ninja challenge
Tom says that 8,001 less than 9,502 is 1,499. Is Tom correct? Explain why.
= 6 18
93
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 30 Monday
Tuesday
1.
5
multiplied by
8
=
1.
6
multiplied by
7
=
2.
46
times
8
is equal to
2.
52
times
9
is equal to
3.
132
x
3
=
3.
231
x
4
=
4.
10 19
less than
18 19
=
4.
8 19
less than
17 19
=
5.
3,600
shared by
9
=
5.
4,200
shared by
6
=
6.
4 7
of
21
=
6.
5 7
of
42
=
7.
1,562
+
1,147
=
7.
1,294
+
1,105
=
8.
1,782
–
1,162
=
8.
2,984
–
1,316
=
9.
half
of
80
=
9.
half
of
120
=
10.
double
20
=
10.
double
80
=
Wednesday
Thursday
1.
9
multiplied by
5
multiplied by
7
=
2.
63
times
2.
29
times
9
is equal to
3.
312
x
3
4.
9 19
less than
15 19
3.
415
=
4.
8 19
x
2
=
less than
11 19
=
5.
2,700
shared by
3
=
5.
3,200
shared by
8
=
6.
6 7
of
14
=
6.
3 7
of
63
=
7.
1,047
+
1,018
=
7.
2,364
+
1,846
=
8.
2,458
–
1,193
=
8.
3,471
–
1,506
=
9.
half
of
140
=
9.
half
of
180
=
10.
double
90
=
10.
double
130
=
7
=
1.
5
is equal to
=
Friday 1.
8
multiplied by
7
=
2.
36
times
7
is equal to
3.
243
x
3
=
4.
18 19
less than
19 19
=
5.
8,800
shared by
8
=
6.
5 6
of
36
=
7.
2,372
+
1,983
=
8.
3,893
–
1,162
=
9.
half
of
220
=
10.
double
140
=
94
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 94
Ninja challenge
Tom shares 42 by 10. Sam shares 60 by 10. Iko shares 31 by 10. They agree that all of their answers are less than 5. Are they correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 30 Monday
Tuesday
1.
4.5
+
1.
12.3
+
2.
5.5
+
=
6.3
2.
12.3
+
=
16.8
3.
6.3
–
=
4.
of
30
of
6.
1 5 1 5 1 5
3.8
3.
15.8
–
=
11.5
=
4.
of
60
=
300
=
5.
of
600
=
of
3,000
=
6.
1 5 1 5 1 5
of
6,000
=
7.
52
÷
4
=
7.
93
÷
3
=
8.
96
÷
2
=
8.
64
÷
2
=
9.
12 7
–
4 7 1 2
9.
15 8
–
4 8 7 9
=
5.
10.
0.8
=
=
= +
6 2
10.
=
Wednesday
0.5
=
+
12 9
Thursday
1.
6.4
+
1.
3.2
+
2.
6.4
+
=
10.1
2.
3.2
+
=
8.8
3.
12.1
–
=
4.
of
18
of
6.
1 3 1 3 1 3
8.7
3.
8.8
–
=
5.2
=
4.
of
56
=
180
=
5.
of
560
=
of
1,800
=
6.
1 8 1 8 1 8
of
5,600
=
7.
90
÷
3
=
7.
52
÷
2
=
8.
82
÷
2
=
8.
85
÷
5
=
9.
26 19
–
4 19 15 9
9.
22 18
–
5 18 15 12
=
5.
10.
0.7
=
=
= +
12 9
1.
4.3
+
2.
4.3
+
=
6.8
3.
7.8
–
=
2.3
4.
of
66
=
of
660
=
6.
1 11 1 11 1 11
of
6,600
=
7.
99
÷
3
=
8.
75
÷
3
=
9.
34 20
–
6 20 14 8
=
5.
10.
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 95
=
+
=
=
+
5 12
Ninja challenge
Friday 0.5
10.
0.6
Tom multiplies 435 by 4. What answer does Tom get?
12 8 95
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 30 Monday 1.
9,725
=
2.
7,033
=
10,034
3.
7.42
+
4.
9.43
Tuesday 1.
10,839
=
–
2.
5,103
=
10,475
–
6.13
=
3.
8.03
+
5.37
=
–
2.32
=
4.
11.34
–
6.43
=
=
5 6
of
42
5.
=
5 7
of
49
6.
=
500
x
3
6.
=
400
x
6
7.
multiplied by
7.
multiplied by
40
is equal to
360
=
13 or 2 3 5 5 13 14
5.
8.
7 5
9. 10.
420
+
30
+
4,001
is equal to
180
=
11 or 2 1 5 5 9 14
–
7 14
equals
÷
7
=
8.
8 5
9. 10.
490
Wednesday 1.
11,574
=
2.
4,790
=
11,273
3.
8.39
+
4.
12.29
+
+ –
2 14
equals
÷
7
=
3,901
Thursday 1.
13,763
=
–
2.
3,713
=
12,805
–
6.09
=
3.
9.05
+
4.37
=
–
3.74
=
4.
13.5
–
3.9
=
5.
=
7 9
of
63
5.
=
3 8
of
32
6.
=
700
x
6
6.
=
900
x
6
7.
multiplied by
80
is equal to
480
7.
20
is equal to
160
=
10 or 1 4 6 6 8 9
multiplied by
8.
=
8 or 1 2 6 6 5 9
8.
9 6
9. 10.
360
+
+ –
4 9
equals
÷
9
=
4,203
1.
17,389
=
2.
4,969
=
13,283
–
3.
7.67
+
6.76
=
4.
14.1
–
5.8
=
=
3 8
of
72
6.
=
800
x
6
7.
multiplied by
40
is equal to
280
=
10 or 1 4 6 6 1 9
5.
8.
5 6
9. 10.
270
+
+ –
10 9
equals
÷
3
=
96
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 96
9. 10.
Friday 8,384
3 6
180
+
+ –
10 9
equals
÷
6
=
5,389
Ninja challenge
What number does Cho multiply 900 by to get an answer of 10,800?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 31 Monday
Tuesday
1.
80
x
3
=
1.
90
x
3
=
2.
18
x
7
is equal to
2.
26
x
8
is equal to
3.
253
x
4
=
3.
246
x
3
=
4.
7 14
+
5 14
=
4.
5 14
+
5 14
=
5.
96
÷
8
=
5.
36
÷
6
=
6.
1 2
of
36
=
6.
2 3
of
27
=
7.
4,382
+
2,173
=
7.
4,362
+
2,142
=
8.
5,162
–
2,059
=
8.
6,578
–
2,462
=
9.
quarter
of
40
=
9.
quarter
of
16
=
10.
third
of
15
=
10.
third
of
21
=
Wednesday
Thursday
1.
60
x
6
=
1.
70
x
6
=
2.
46
x
9
is equal to
2.
56
x
6
is equal to
3.
317
x
4
=
3.
325
x
3
=
4.
1 14
+
5 14
=
4.
9 10
–
5 10
=
5.
49
÷
7
=
5.
56
÷
7
=
6.
2 5
of
35
=
6.
4 5
of
40
=
7.
5,192
+
2,237
=
7.
5,383
+
3,163
=
8.
6,163
–
2,081
=
8.
7,671
–
4,219
=
9.
quarter
of
36
=
9.
quarter
of
24
=
10.
third
of
18
=
10.
third
of
9
=
Friday 1.
90
x
6
=
2.
48
x
7
is equal to
3.
183
x
3
=
4.
8 10
–
5 10
=
5.
35
÷
7
=
6.
5 8
of
24
=
7.
5,364
+
3,177
=
8.
7,374
–
4,181
=
9.
quarter
of
20
=
10.
third
of
60
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 97
Ninja challenge
Tom states that 600 less than 2,034 is greater than 1,600. Is Tom correct? Explain why.
97
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 31 Monday
Tuesday
1.
3.5
+
1.6
=
1.
2.4
+
3.5
=
2.
13.5
+
1.6
=
2.
12.4
+
3.5
=
3.
17.1
–
1.6
=
3.
16.5
–
2.9
=
4.
of
30
=
4.
15
=
of
30
=
5.
of
15
=
of
300
=
6.
1 5 2 5 2 5
of
6.
1 3 2 3 2 3
of
150
=
7.
76
÷
2
=
7.
88
÷
2
=
8.
60
÷
4
=
8.
88
÷
4
=
9.
15 9
–
4 9 6 8
9.
17 11
–
2 11 7 5
=
5.
10.
=
= +
6 8
10.
=
Wednesday
+
Thursday
1.
6.2
+
3.7
=
1.
3.7
+
1.4
=
2.
26.2
+
3.7
=
2.
21.4
+
3.7
=
3.
27.2
–
3.9
=
3.
24.4
–
5.7
=
4.
of
28
=
4.
36
=
of
28
=
5.
of
36
=
of
280
=
6.
1 9 2 9 2 9
of
6.
1 7 2 7 2 7
of
360
=
7.
96
÷
6
=
7.
48
÷
3
=
8.
39
÷
3
=
8.
98
÷
2
=
9.
15 4
–
4 4 7 8
9.
17 5
–
8 5 8 12
=
5.
10.
=
= +
5 8
1.
3.9
+
4.5
=
2.
3.5
+
14.9
=
3.
19.4
–
13.9
=
4.
of
14
=
of
14
=
6.
1 7 2 7 2 7
of
140
=
7.
99
÷
3
=
8.
58
÷
2
=
9.
34 20
–
7 20 9 10
=
10.
=
98
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 98
+
10.
=
+
5 12
Ninja challenge
Friday
5.
4 5
Cho states that 5 times 160 is equal to 8 multiplied by 100. Is Cho correct? Explain why.
6 10 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 31 Monday
Tuesday =
500
2.
=
800
=
3.
4.5
7.43
=
5.8
=
4.
2.4
7.3
=
of
45
=
5.
3 7
more than less than
more than less than
of
28
=
6.
=
156
÷
6.
=
185
÷
7.
multiplied by
7.
multiplied by
50
is equal to
2,500
=
1.
=
800
2.
=
700
3.
3.23
6.14
4.
4.6
5.
3 5
more than less than
40
8.
+
9.
+
6 7 6 9
10.
÷
7
more than less than
3,475
1.
9,751
6
is equal to
2,800
=
8.
+
equals
10 or 1 3 7 7 10 or 1 1 9 9
9.
=
30
10.
Wednesday 1.
=
700
2.
=
300
more than less than
5.98
=
3.
5.4
9.4
=
4.
5.7
of
64
=
5.
4 6
6.
=
252
÷
7.
multiplied by
8.
+
9. 10.
6.7
4.
4.3
5.
3 8
+
3 7 4 9
equals
9 or 1 2 7 7 12 or 1 3 9 9
÷
6
=
90
9,806
1.
=
800
7,034
2.
=
600
more than less than
more than less than
6.7
=
11.6
=
of
30
=
6.
=
504
÷
9
60
is equal to
5,400
= equals
17 or 2 3 7 7 11 or 1 1 10 10
=
20
7
60
is equal to
4,200
7.
=
+
equals
12 or 1 5 7 7 11 or 1 2 9 9
8.
+
6 7 7 9
multiplied by
9.
+
9 7 6 10
÷
6
=
80
10.
÷
6
=
700
2.
=
500
3.
7.4
9.8
=
4.
7.8
10.4
=
5.
5 8
more than less than
more than less than
of
40
=
6.
=
348
÷
7.
multiplied by
60
is equal to
3,000
=
8.
+
9.
+
9 9 5 10
10.
÷
5
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 99
5
2,905
Friday 1.
9,104
Thursday more than less than
3.
3,905
10,902 4,034
5,104
Ninja challenge
Iko tells Sam that she has 27, and that 27 is equal to 37 of 63. Is Iko correct? Explain why.
6
equals
17 or 1 8 9 9 13 or 1 3 10 10
=
80 99
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 32 Monday
Tuesday
1.
30
x
6
=
1.
40
x
7
=
2.
68
x
6
is equal to
2.
26
x
4
is equal to
3.
273
x
4
=
3.
262
x
5
=
4.
9 10
–
2 10
=
4.
3 10
–
2 10
=
5.
84
÷
7
=
5.
42
÷
7
=
6.
7 8
of
48
=
6.
4 5
of
45
=
7.
1,834
+
1,179
=
7.
1,673
+
1,647
=
8.
5,374
–
4,192
=
8.
6,629
–
2,518
=
9.
quarter
of
40
=
9.
quarter
of
20
=
10.
third
of
30
=
10.
third
of
3
=
Wednesday
Thursday
1.
60
x
3
=
1.
50
x
7
=
2.
45
x
6
is equal to
2.
62
x
7
is equal to
3.
315
x
4
=
3.
253
x
6
=
4.
9 10
–
3 10
=
4.
9 12
–
8 12
=
5.
45
÷
9
=
5.
35
÷
7
=
6.
4 6
of
24
=
6.
2 6
of
36
=
7.
1,375
+
1,183
=
7.
2,254
+
1,485
=
8.
7,268
–
3,219
=
8.
4,465
–
3,182
=
9.
quarter
of
100
=
9.
quarter
of
80
=
10.
third
of
60
=
10.
third
of
15
=
Friday 1.
70
x
7
=
2.
74
x
6
is equal to
3.
187
x
9
=
4.
13 14
–
8 14
=
5.
63
÷
9
=
6.
3 7
of
49
=
7.
3,462
+
1,516
=
8.
5,394
–
1,484
=
9.
quarter
of
40
=
10.
third
of
9
=
100
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 100
Ninja challenge
Sam divides 36 by 9 and gets the answer of 4. If Sam divides 360 by 9, what answer will he get?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 32 Monday
Tuesday
1.
4.6
+
3.9
=
1.
5.6
+
4.7
=
2.
7.6
+
10.9
=
2.
7.6
+
6.7
=
3.
19.6
–
7.9
=
3.
16.6
–
7.7
=
4.
1 5
of
30
=
4.
1 6
of
42
=
5.
300
÷
5
=
5.
420
÷
6
=
6.
1 5
of
3,000
=
6.
1 6
of
4,200
=
7.
72
÷
3
=
7.
84
÷
4
=
8.
78
÷
2
=
8.
95
÷
5
=
9.
19 20
+
4 20 16 9
9.
3 5
+
4 5 17 12
=
10.
=
= –
6 9
10.
=
Wednesday
–
Thursday
1.
6.7
+
3.6
=
1.
7.8
+
3.9
=
2.
8.7
+
5.6
=
2.
4.8
+
12.9
=
3.
17.3
–
8.6
=
3.
19.8
–
12.9
=
4.
1 8
of
32
=
4.
1 9
of
27
=
5.
320
÷
8
=
5.
270
÷
9
=
6.
1 8
of
3,200
=
6.
1 9
of
2,700
=
7.
57
÷
3
=
7.
69
÷
3
=
8.
91
÷
7
=
8.
96
÷
2
=
9.
6 11
+
8 11 17 9
9.
17 25
+
9 25 14 11
=
10.
=
= –
5 9
1.
7.4
+
3.8
=
2.
12.4
+
4.8
=
3.
19.2
–
12.8
=
4.
1 4
of
28
=
5.
280
÷
4
=
6.
1 4
of
2,800
=
7.
54
÷
3
=
8.
75
÷
5
=
9.
7 15
+
11 15 19 12
=
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 101
–
10.
=
–
7 11
Ninja challenge
Friday
10.
11 12
Sam shares 98 counters equally into 7 groups. How many counters will be in each group?
4 12 101
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 32 Monday
Tuesday
1.
=
6
x
7
1.
=
8
x
9
2.
x
6
=
240
2.
x
6
=
420
x
100
=
3.
52
3.
x
100
=
4.
multiplied by
60
is equal to
3,600
23
5.
÷
4
=
18
4
6.
=
268
÷
4
4.
multiplied by
60
is equal to
1,800
5.
÷
3
=
6.
=
212
÷
÷
100
=
7.
360
8.
5 6
of
36
9.
+
10.
+
6 14 7 10
= = equals
16 or 1 2 14 14 17 or 1 7 10 10
78
7.
470
÷
100
=
8.
5 10
of
90
=
9.
+
=
10.
+
9 14 4 10
Wednesday
equals
20 or 1 6 14 14 12 or 1 2 10 10
Thursday
1.
=
7
x
12
1.
=
9
x
10
2.
x
6
=
540
2.
x
8
=
560
x
100
=
x
100
=
4.
multiplied by
60
is equal to
4,800
4.
multiplied by
60
is equal to
3,000
5.
÷
3
=
19
5.
÷
6
=
16
6.
=
116
÷
4
6.
=
144
÷
4
3.
98
3.
12
7.
110
÷
100
=
7.
930
÷
100
=
8.
9 10
of
80
=
8.
of
60
=
9.
+
9.
+
+
10.
+
9 14 9 12
=
10.
9 14 5 12
4 10
= equals
17 or 1 3 14 14 14 or 1 2 12 12
Friday 1.
=
6
x
10
2.
x
8
=
640
3.
46
x
100
=
4.
multiplied by
60
is equal to
1,200
5.
÷
7
=
14
6.
=
272
÷
4
7.
850
÷
100
=
8.
9 10
of
30
=
9.
+
=
10.
+
10 14 11 12
102
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 102
equals
equals
19 or 1 5 14 14 18 or 1 6 12 12
Ninja challenge
If Tom has 12 groups of 800, how many does he have in total?
25 or 1 11 14 14 21 or 1 9 12 12 Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 33 Monday
Tuesday
1.
40
groups of
8
=
1.
60
groups of
7
=
2.
46
multiplied by
9
is equal to
2.
56
multiplied by
6
is equal to
3.
205
times
9
=
3.
216
times
5
=
4.
360
divided by
6
=
4.
270
divided by
3
=
5.
63
shared by
10
equals
5.
72
shared by
10
equals
6.
8.4
x
10
=
6.
1.5
x
10
=
7.
3,000
plus
1,516
=
7.
2,000
plus
1,050
=
8.
5,000
minus
1,484
=
8.
4,000
minus
2,016
=
9.
0.6
add
0.6
equals
9.
0.8
add
0.5
equals
10.
1.4
subtract
0.5
=
10.
1.1
subtract
0.8
=
Wednesday 1.
4
Thursday =
1.
60
groups of
5
=
2.
56
multiplied by
7
is equal to
=
3.
452
times
6
=
6
=
4.
240
divided by
4
=
shared by
10
equals
5.
74
shared by
10
equals
4.1
x
10
=
6.
6.3
x
10
=
7.
5,000
plus
2,006
=
7.
1,000
plus
3,905
=
8.
5,000
minus
3,905
=
8.
4,000
minus
1,674
=
9.
1.8
add
1.4
equals
9.
3.3
add
2.6
equals
10.
1.9
subtract
1.4
=
10.
3.2
subtract
1.7
=
90
groups of
2.
29
multiplied by
8
is equal to
3.
412
times
3
4.
480
divided by
5.
86
6.
Friday 1.
90
groups of
9
=
2.
72
multiplied by
6
is equal to
3.
409
times
7
=
4.
180
divided by
3
=
5.
99
shared by
10
equals
6.
2.7
x
10
=
7.
2,000
plus
1,374
=
8.
5,000
minus
1,047
=
9.
3.1
add
2.8
equals
10.
4.2
subtract
1.9
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 103
Ninja challenge
Cho says that 6 x 7 is greater than 40. Is Cho correct? Explain why.
103
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 33 Monday
Tuesday
1.
0.59
+
0.35
=
1.
0.36
+
0.28
=
2.
0.69
+
0.35
=
2.
0.96
+
0.28
=
3.
1.79
+
1.35
=
3.
1.96
+
2.28
=
4.
70
x
3
=
4.
80
x
3
=
5.
700
x
3
=
5.
300
x
8
=
6.
470
÷
2
=
6.
730
÷
2
=
7.
804
÷
3
=
7.
762
÷
3
=
8.
925
÷
5
=
8.
680
÷
5
=
9.
4
÷
10
=
9.
3
÷
10
=
10.
4
÷
100
=
10.
3
÷
100
=
Wednesday
Thursday
1.
0.75
+
0.23
=
1.
0.57
+
0.32
=
2.
0.85
+
0.43
=
2.
0.77
+
0.42
=
3.
2.85
+
3.43
=
3.
4.77
+
1.42
=
4.
3
x
50
=
4.
2
x
120
=
5.
500
x
3
=
5.
2
x
1,200
=
6.
344
÷
2
=
6.
950
÷
2
=
7.
792
÷
3
=
7.
759
÷
3
=
8.
840
÷
5
=
8.
875
÷
5
=
9.
2
÷
10
=
9.
5
÷
10
=
10.
2
÷
100
=
10.
5
÷
100
=
Friday 1.
0.35
+
0.57
=
2.
0.45
+
0.67
=
3.
6.45
+
3.67
=
4.
3
x
40
=
5.
30
x
40
=
6.
736
÷
2
=
7.
894
÷
3
=
8.
980
÷
5
=
9.
6
÷
10
=
10.
6
÷
100
=
104
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 104
Ninja challenge
Tom says that 0.54 less than 1.28 is equal to 0.74. Is Tom correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 33 Monday
Tuesday
1.
14
=
x
2
1.
45
=
x
5
2.
200
times
=
1,600
2.
400
times
=
3,200
=
350
3.
groups of
100
=
410
4.
multiplied by
60
is equal to
540
shared by
6
=
=
592
divided by
÷
100
=
8 12
of
3.
groups of
4.
multiplied by
60
is equal to
shared by
6
=
=
376
divided by
÷
100
=
=
8 10
5.
234
6. 7.
45
8.
24
9.
8 or 1 3 5 5
10.
100
= 7 6
5. 8
equals
4 5 17 or 2 5 6 6
258
6. 7.
of +
+
600
64
8.
32
=
9.
9 or 1 4 5 5
=
10.
+
Wednesday
equals
2 5 13 or 2 1 6 6
+ 8 6
8
Thursday
1.
42
=
x
6
1.
81
=
x
9
2.
500
times
=
4,000
2.
900
times
=
7,200
3.
groups of
100
=
440
3.
groups of
100
=
450
4.
multiplied by
60
is equal to
420
4.
multiplied by
30
is equal to
210
shared by
6
=
shared by
6
=
=
352
divided by
=
608
divided by
5.
330
6.
5. 8
288
6.
7.
74
÷
100
=
7.
78
÷
100
=
8.
50
=
of
8.
49
=
9.
9.
9 or 1 4 5 5
7 9
of
8 or 1 3 5 5
10 12
=
10.
=
+ 12 9
+
equals
2 5 22 or 2 4 9 9
Friday 1.
84
=
x
12
2.
600
times
=
7,200
3.
groups of
100
=
810
4.
multiplied by
30
is equal to
240
shared by
6
=
=
448
divided by
÷
100
=
2 9
of
5.
246
6. 7.
92
8.
6
=
9.
11 or 1 4 7 7
=
10.
+
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 105
+ 13 9
equals
10.
+
+ 6 9
equals
8
1 5 21 or 2 3 9 9
Ninja challenge
Tom tells Sam that he has 46, and that 46 is equal to 67 of 56. Is Tom correct? Explain why.
8
3 7 28 or 3 1 9 9 105
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 34 Monday
Tuesday
1.
30
groups of
9
=
1.
50
groups of
8
=
2.
57
multiplied by
6
is equal to
2.
78
multiplied by
3
is equal to
3.
96
÷
3
=
3.
68
÷
2
=
4.
150
divided by
5
=
4.
210
divided by
3
=
5.
8
shared by
10
equals
5.
9
shared by
10
equals
6.
0.6
x
10
=
6.
0.2
x
10
=
7.
8
x
3
=
7.
9
x
6
=
8.
64
divided by
8
=
8.
48
divided by
6
=
9.
4.5
add
1.7
equals
9.
4.9
add
1.4
equals
10.
4.5
subtract
3.8
=
10.
4.1
subtract
2.5
=
Wednesday 1.
8
Thursday =
1.
70
groups of
5
=
2.
92
multiplied by
6
is equal to
=
3.
72
÷
3
=
5
=
4.
280
divided by
4
=
shared by
10
equals
5.
9
shared by
10
equals
0.1
x
10
=
6.
0.4
x
10
=
7.
8
x
7
=
7.
6
x
9
=
8.
81
divided by
9
=
8.
56
divided by
8
=
9.
5.5
add
1.6
equals
9.
6.8
add
4.3
equals
10.
6.4
subtract
3.9
=
10.
7.9
subtract
5.2
=
60
groups of
2.
83
multiplied by
5
is equal to
3.
92
÷
4
4.
450
divided by
5.
6
6.
Friday 1.
80
groups of
7
=
2.
85
multiplied by
7
is equal to
3.
102
÷
3
=
4.
320
divided by
4
=
5.
7
shared by
10
equals
6.
0.1
x
10
=
7.
5
x
9
=
8.
27
divided by
9
=
9.
6.4
add
4.9
equals
10.
7.1
subtract
6.6
=
106
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 106
Ninja challenge
Sam doubles 50 and tells Tom this is equal to 10 x 10. Is Sam correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 34 Monday
Tuesday
1.
0.05
+
0.87
=
1.
0.45
+
0.39
=
2.
0.05
+
0.97
=
2.
0.65
+
0.49
=
3.
1.05
+
4.97
=
3.
12.65
+
10.65
=
4.
40
x
6
=
4.
30
x
3
=
5.
6
x
400
=
5.
300
x
3
=
6.
924
÷
2
=
6.
456
÷
2
=
7.
741
÷
3
=
7.
804
÷
3
=
8.
195
÷
5
=
8.
625
÷
5
=
9.
1
÷
10
=
9.
7
÷
10
=
10.
1
÷
100
=
10.
7
÷
100
=
Wednesday
Thursday
1.
0.59
+
0.25
=
1.
0.52
+
0.45
=
2.
0.89
+
0.25
=
2.
0.62
+
0.65
=
3.
3.89
+
4.25
=
3.
3.62
+
4.65
=
4.
80
x
7
=
4.
80
x
6
=
5.
7
x
800
=
5.
80
x
60
=
6.
856
÷
2
=
6.
568
÷
2
=
7.
741
÷
3
=
7.
813
÷
3
=
8.
850
÷
5
=
8.
265
÷
5
=
9.
9
÷
10
=
9.
8
÷
10
=
10.
9
÷
100
=
10.
8
÷
100
=
Friday 1.
0.13
+
0.09
=
2.
0.67
+
0.39
=
3.
5.67
+
5.39
=
4.
3
x
9
=
5.
300
x
9
=
6.
712
÷
2
=
7.
894
÷
3
=
8.
735
÷
5
=
9.
2
÷
10
=
10.
2
÷
100
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 107
Ninja challenge
Iko adds 0.83 to 3.78. Iko says her answer is greater than 4.5. Is Iko correct? Explain why.
107
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 34 Monday 1. 2.
6
= 900
3.
times
Tuesday groups of
7
1.
=
10,800
2.
740
3.
groups of
100
=
shared by
100
=
=
415
divided by
75
÷
100
=
7.
=
6
divided by
8.
7
multiplied by
4.
9
5. 6.
9. 10.
x 10
100
is equal to
2.
500
3. 4.
5
5. 6.
57
7. 8.
7
9. 10.
9
= times
=
=
605
divided by
49
÷
100
=
7.
=
8
divided by
10
9
multiplied by
is equal to
270
=
1
times
100
groups of
7
=
6,300 19
14
5.
is equal to
210
8.
=
7
9.
times
100
10.
x 140
90
groups of
7
1.
=
3,500
2.
15
3.
shared by
10
=
=
715
divided by
÷
100
=
=
150
divided by
10
7.
is equal to
350
8.
=
5
9.
times
100
10.
is equal to
4. 100
2.
= 300
3.
9
times
groups of
7
=
2,100 56
groups of
10
=
shared by
10
=
=
216
divided by
÷
100
=
7.
=
360
divided by
10
8.
multiplied by
is equal to
250
=
9
times
100
4.
8
5. 6.
43 5
9. 10.
x 120
100
is equal to
108
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 108
is equal to
5
= 900 2
5. 6.
Friday 1.
100
100
Thursday
=
100
150
100
10
x
4,800
shared by
groups of
multiplied by
= =
Wednesday 1.
times
7
100
6. 10
400
groups of
groups of
4. 100
8
=
23 12
times groups of
10
=
shared by
10
=
=
856
divided by
÷
100
=
=
140
divided by
10
is equal to
600
=
4
times
100
multiplied by
x 40
100
is equal to
100
Ninja challenge
Cho says that if she doubles the numbers 200 and 300, the difference between the answers is 100. Is Cho correct? Explain why.
100
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 35 Monday
Tuesday
1.
60
x
7
=
1.
70
x
7
=
2.
65
x
8
is equal to
2.
68
x
6
is equal to
3.
135
÷
3
=
3.
152
÷
4
=
4.
400
divided by
5
=
4.
240
divided by
4
=
5.
16
shared by
10
equals
5.
25
shared by
10
equals
6.
1.4
x
100
=
6.
2.8
x
100
=
7.
6
x
9
=
7.
8
x
9
=
8.
72
divided by
9
=
8.
54
divided by
9
=
9.
2.4
equals
1.4
more than less than
1.9
10.
more than less than
5.5
=
4.9
equals
9.
3.8
6.1
=
10.
1.9
Wednesday
Thursday
1.
60
x
9
=
1.
70
x
9
=
2.
86
x
4
is equal to
2.
74
x
8
is equal to
3.
224
÷
4
=
3.
192
÷
6
=
4.
200
divided by
5
=
4.
550
divided by
5
=
5.
29
shared by
10
equals
5.
32
shared by
10
equals
6.
1.1
x
100
=
6.
1.9
x
100
=
7.
5
x
9
=
7.
7
x
8
=
8.
36
divided by
4
=
8.
81
divided by
9
=
9.
3.2
equals
2.3
more than less than
5.3
10.
more than less than
9.7
=
2.4
equals
9.
4.2
4.1
=
10.
4.3
Friday 1.
60
x
9
=
2.
84
x
8
is equal to
3.
108
÷
6
=
4.
640
divided by
8
=
5.
45
shared by
10
equals
6.
3.2
x
100
=
7.
9
x
8
=
8.
64
divided by
8
=
9.
1.7
4.7
equals
10.
2.9
more than less than
11.3
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 109
Ninja challenge
Cho says that the difference between 1,374 and 2,000 is greater than 600. Is Cho correct? Explain why.
109
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 35 Monday
Tuesday
1.
0.78
–
0.45
=
1.
0.85
–
0.39
=
2.
1.08
–
0.45
=
2.
1.15
–
0.39
=
3.
13.28
–
2.35
=
3.
3.25
–
0.39
=
4.
40
x
4
=
4.
20
x
8
=
5.
40
x
40
=
5.
200
x
8
=
6.
992
÷
4
=
6.
940
÷
4
=
7.
750
÷
6
=
7.
870
÷
6
=
8.
984
÷
8
=
8.
920
÷
8
=
9.
45
÷
10
=
9.
56
÷
10
=
10.
45
÷
100
=
10.
56
÷
100
=
Wednesday
Thursday
1.
0.67
–
0.29
=
1.
0.87
–
0.13
=
2.
1.27
–
0.29
=
2.
1.37
–
0.43
=
3.
4.37
–
2.49
=
3.
5.47
–
2.63
=
4.
80
x
9
=
4.
20
x
7
=
5.
8
x
900
=
5.
700
x
2
=
6.
300
÷
4
=
6.
952
÷
4
=
7.
588
÷
6
=
7.
744
÷
6
=
8.
904
÷
8
=
8.
936
÷
8
=
9.
76
÷
10
=
9.
87
÷
10
=
10.
76
÷
100
=
10.
87
÷
100
=
Friday 1.
0.98
–
0.45
=
2.
1.08
–
0.35
=
3.
4.28
–
1.35
=
4.
50
x
7
=
5.
700
x
5
=
6.
660
÷
4
=
7.
588
÷
6
=
8.
448
÷
8
=
9.
13
÷
10
=
10.
13
÷
100
=
110
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 110
Ninja challenge
Cho divides 996 by 4. What is her answer?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 35 Monday 1.
35
2. 3.
7.6
4. 5.
7.32
6. 7.
=
8.
groups of
7
1.
3,000
2.
times
6
=
groups of
10
=
shared by
10
=
0.2
4.
divided by
100
5.
=
0.47
6.
divided by
10
7.
= ÷
2.4
Tuesday
100
= multiplied by
50
is equal to
100
=
9.
0.12
x
10.
56
=
groups of
3.
350 7
72 8.2 1.92 2.6
8.
18
2. 3.
4.5
4. 5.
3.72
6. 7.
=
4.5
8.
groups of
3
1.
1,800
2.
10
=
0.9
4.
divided by
100
5.
=
0.73
6.
divided by
10
7.
120
8.
multiplied by
30
is equal to
100
=
10.
24
=
groups of
3.
4
Friday 1.
50
2. 3.
9.3
4. 5.
5.46
6. 7.
=
8.
5 2,700
3
=
groups of
10
=
shared by
10
=
0.2
divided by
100
=
0.37
divided by
10 350
÷ 11.4
groups of
times
= 100
= multiplied by
50
is equal to
100
=
9.
0.71
x
10.
27
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 111
10
=
0.5
divided by
100
=
0.64
divided by
10 540
= 100
= multiplied by
60
is equal to
100
= groups of
9
groups of
5 1,400
Thursday
shared by
x
shared by
=
=
0.52
=
72
10
9.
10
10.
groups of
=
groups of
x
=
100
3,600
=
0.17
2
÷
12
6
9.
times
=
groups of
times
÷
Wednesday 1.
=
groups of
30 6.1 4.18
= times
2
=
groups of
10
=
shared by
10
=
0.5
divided by
100
=
0.19
divided by
10 180
= ÷
10.7
100
= multiplied by
30
is equal to
100
=
9.
0.61
x
10.
28
=
groups of
4
Ninja challenge
Iko says that the total of 10,383 and 8,265 is 18,641. Is Iko correct? Explain why.
3 111
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 36 Monday
Tuesday
1.
400
x
9
=
1.
500
x
9
=
2.
124
x
8
is equal to
2.
172
x
4
is equal to
3.
130
÷
5
=
3.
102
÷
6
=
4.
240
divided by
8
=
4.
600
divided by
6
=
5.
95
shared by
10
equals
5.
46
shared by
10
equals
6.
4.5
x
100
=
6.
1.9
x
100
=
7.
7
x
7
=
7.
6
x
6
=
8.
56
divided by
8
=
8.
49
divided by
7
=
9.
1.9
equals
3.4
more than less than
5.8
10.
more than less than
12.4
=
3.7
equals
9.
4.5
9.3
=
10.
3.7
Wednesday
Thursday
1.
300
x
7
=
1.
400
x
7
=
2.
254
x
5
is equal to
2.
362
x
3
is equal to
3.
76
÷
4
=
3.
161
÷
7
=
4.
320
divided by
4
=
4.
160
divided by
4
=
5.
57
shared by
10
equals
5.
87
shared by
10
equals
6.
2.5
x
100
=
6.
8.9
x
100
=
7.
8
x
8
=
7.
9
x
9
=
8.
36
divided by
6
=
8.
64
divided by
8
=
9.
1.9
equals
4.5
more than less than
8.3
10.
more than less than
12.1
=
9.4
equals
9.
6.7
11.6
=
10.
5.3
Friday 1.
700
x
7
=
2.
423
x
5
is equal to
3.
135
÷
9
=
4.
720
divided by
9
=
5.
42
shared by
10
equals
6.
7.3
x
100
=
7.
4
x
4
=
8.
81
divided by
9
=
9.
7.4
5.9
equals
10.
6.7
more than less than
11.2
=
112
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 112
Ninja challenge
Iko says that 46 groups of 6 is equal to 267. Is Iko correct?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 36 Monday
Tuesday
1.
0.67
–
0.19
=
1.
0.86
–
0.29
=
2.
1.27
–
0.29
=
2.
1.26
–
0.89
=
3.
4.37
–
1.69
=
3.
4.16
–
2.39
=
4.
30
x
6
=
4.
7
x
80
=
5.
300
x
6
=
5.
700
x
8
=
6.
344
÷
4
=
6.
584
÷
4
=
7.
468
÷
6
=
7.
492
÷
6
=
8.
376
÷
8
=
8.
504
÷
8
=
9.
77
÷
10
=
9.
86
÷
10
=
10.
77
÷
100
=
10.
86
÷
100
=
Wednesday
Thursday
1.
0.87
–
0.38
=
1.
0.72
–
0.47
=
2.
1.47
–
0.78
=
2.
1.22
–
0.97
=
3.
7.37
–
2.88
=
3.
7.32
–
4.37
=
4.
3
x
200
=
4.
9
x
70
=
5.
3,000
x
2
=
5.
900
x
7
=
6.
312
÷
4
=
6.
144
÷
4
=
7.
330
÷
6
=
7.
348
÷
6
=
8.
152
÷
8
=
8.
584
÷
8
=
9.
78
÷
10
=
9.
18
÷
10
=
10.
78
÷
100
=
10.
18
÷
100
=
Friday 1.
0.67
–
0.49
=
2.
1.17
–
0.59
=
3.
7.01
–
3.29
=
4.
70
x
6
=
5.
700
x
6
=
6.
384
÷
4
=
7.
618
÷
6
=
8.
496
÷
8
=
9.
59
÷
10
=
10.
59
÷
100
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 113
Ninja challenge
Iko divides 360 by 100. Iko says her answer is 36. Is Iko correct? Explain why.
113
15/09/2022 09:51
v
GRAND MASTER LEVEL
WEEK 36 Monday
Tuesday
1.
=
100
groups of
5
1.
=
100
groups of
4
2.
x
3
=
270
2.
x
3
=
180
groups of
100
=
groups of
100
=
divided by
10
=
2.5
4.
divided by
10
=
3.6
divided by
10
5.
divided by
10
=
0.37
6.
=
0.61
divided by
100
7.
divided by
100
3.
9.3
4. 5.
54.6
6. 7.
= ÷
0.07
10
=
3.
8.
multiplied by
50
is equal to
3,500
9.
shared by
10
=
10.
=
100
groups of
6.3 20.1
= ÷
0.04
10
=
8.
multiplied by
50
is equal to
3,000
0.07
9.
shared by
10
=
0.08
0.8
10.
=
100
groups of
0.4
Wednesday
Thursday
1.
=
100
groups of
9
1.
=
100
groups of
12
2.
x
7
=
280
2.
x
7
=
630
groups of
100
=
groups of
100
=
divided by
10
=
1.8
4.
divided by
10
=
3.8
divided by
10
5.
divided by
10
=
0.74
6.
=
0.61
divided by
100
7.
divided by
100
3.
4.7
4. 5.
16.3
6. 7.
= ÷
0.09
10
=
3.
4.9 30.5
= ÷
0.06
10
=
8.
multiplied by
60
is equal to
5,400
8.
multiplied by
60
is equal to
4,200
9.
shared by
10
=
0.02
9.
shared by
10
=
0.07
10.
=
100
groups of
0.1
10.
=
100
groups of
0.5
Friday 1.
=
100
groups of
11
2.
x
12
=
720
groups of
100
=
divided by
10
=
4.5
divided by
10
=
0.96
divided by
100
3.
6.9
4. 5.
41.5
6. 7.
= ÷
0.02
10
=
8.
multiplied by
60
is equal to
4,800
9.
shared by
10
=
0.06
10.
=
100
groups of
0.09
114
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 114
Ninja challenge
Cho tells Sam that she has 20, and that 20 is equal to 35 of 35. Is Cho correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 37 Monday
Tuesday
1.
500
x
7
=
1.
400
x
9
=
2.
451
x
4
is equal to
2.
263
x
6
is equal to
3.
136
÷
8
=
3.
168
÷
8
=
4.
270
÷
9
=
4.
280
÷
7
=
5.
+
5. 6.
+
3 6 4 5
=
=
5 6 4 5
+
+
2 4 3 5
=
6.
3 4 4 5
7.
6
x
7
=
7.
8
x
9
=
8.
56
÷
7
=
8.
36
÷
3
=
9.
7.4
+
3.7
equals
9.
6.8
+
5.3
equals
10.
6.7
–
3.5
=
10.
12.4
–
9.6
=
Wednesday
=
Thursday
1.
600
x
9
=
1.
300
x
6
=
2.
138
x
7
is equal to
2.
362
x
5
is equal to
3.
192
÷
8
=
3.
360
÷
8
=
4.
200
÷
4
=
4.
320
÷
4
=
5.
+
5. 6.
+
8 9 5 8
=
=
8 9 5 8
+
+
3 9 5 6
=
6.
8 9 5 6
7.
7
x
9
=
7.
6
x
8
=
8.
48
÷
4
=
8.
55
÷
5
=
9.
7.3
+
6.9
equals
9.
12.3
+
2.9
equals
10.
13.2
–
10.4
=
10.
11.5
–
9.9
=
Friday 1.
600
x
6
=
2.
426
x
6
is equal to
3.
171
÷
9
=
4.
300
÷
6
=
5.
+ +
6 9 7 8
=
6.
7 9 6 8
7.
9
x
8
=
8.
12
÷
2
=
9.
12.1
+
1.9
equals
10.
10.1
–
9.9
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 115
=
Ninja challenge
Sam adds 12.5 to 9.4 and gets the answer 21.1. Is Sam correct? Explain why.
=
115
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 37 Monday
Tuesday
1.
1.45
+
2.08
=
1.
2.56
+
3.38
=
2.
3.63
=
1.58
+
2.
7.94
=
3.56
+
3.
3.43
–
2.58
=
3.
6.94
–
3.28
=
4.
20
x
9
=
4.
40
x
5
=
5.
200
x
9
=
5.
400
x
5
=
6.
852
÷
2
=
6.
795
÷
3
=
7.
390
÷
6
=
7.
485
÷
5
=
8.
861
÷
7
=
8.
621
÷
9
=
9.
1
÷
10
=
9.
86
÷
10
=
10.
78
÷
100
=
10.
3
÷
100
=
Wednesday
Thursday
1.
3.78
+
2.57
=
1.
2.67
+
1.06
=
2.
8.35
=
4.58
+
2.
4.23
=
3.67
+
3.
7.35
–
3.58
=
3.
5.23
–
4.57
=
4.
60
x
4
=
4.
90
x
4
=
5.
600
x
4
=
5.
900
x
4
=
6.
228
÷
6
=
6.
512
÷
2
=
7.
795
÷
5
=
7.
725
÷
5
=
8.
372
÷
4
=
8.
292
÷
4
=
9.
7
÷
10
=
9.
64
÷
10
=
10.
97
÷
100
=
10.
8
÷
100
=
Friday 1.
8.43
+
1.45
=
2.
8.78
=
2.45
+
3.
8.68
–
6.45
=
4.
70
x
4
=
5.
700
x
4
=
6.
117
÷
3
=
7.
430
÷
5
=
8.
132
÷
2
=
9.
3
÷
10
=
10.
76
÷
100
=
116
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 116
Ninja challenge
Iko adds 1,384 to 3,394. Iko says that the answer is less than 4,500. Is Iko correct? Explain why.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 37 Monday
Tuesday
1.
=
6.47
+
5.37
1.
=
9.39
+
6.36
2.
–
3.78
=
4.69
2.
–
5.36
=
4.1
+
4,583
=
+
6,477
=
=
3,583
–
1,378
4.
=
9,034
–
5,304
x
7
5.
x
4
=
0.97
6.
=
0.56
x
100
7.
x
100
=
68
8.
63
3.
8,483
4. 5.
2,905
6. 7.
÷ 260
8. 9. 10.
= 100
= ÷
3 4 4 5
6
3.
of
36
=
9.
+
3 5
=
10.
9,355 1,864
= ÷
370 3 7 3 5
Wednesday
100
= ÷
7
=
of
21
=
+
3 5
=
Thursday
1.
=
11.83
+
2.36
1.
=
12.06
+
6.37
2.
–
5.8
=
5.47
2.
–
2.12
=
8.35
+
5,673
=
+
8,084
=
=
8,376
–
6,596
4.
=
11,370
–
5,632
x
6
5.
x
5
=
1.51
6.
=
1.74
x
100
7.
x
100
=
71
8.
86
3.
10,371
4. 5.
3,138
6. 7.
÷ 620
8. 9. 10.
= 100
= ÷
6 7 5 6
6
of
63
+
3 6
3.
9.
=
10.
=
Friday 1.
=
13.36
+
1.38
2.
–
3.7
=
6.51
+
5,370
=
=
9,304
–
7,043
x
6
=
2.04
x
100 93
3.
12,406
4. 5.
4,224
6. 7.
÷ 370
8. 9. 10.
=
6 9 8 9
100
= ÷
6
=
of
54
=
+
5 9
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 117
11,506 3,615
= ÷
530 6 8 8 6
100
= ÷
6
=
of
32
=
+
5 6
=
Ninja challenge
Sam says that 7,758 more than 4,327 equals 12,805. Is Sam correct? Explain why.
117
15/09/2022 09:51
v
GRASSHOPPER LEVEL
WEEK 38 Monday
Tuesday
1.
60
x
6
=
1.
60
x
7
=
2.
374
x
4
is equal to
2.
184
x
6
is equal to
3.
189
÷
9
=
3.
147
÷
7
=
4.
3,000
÷
6
=
4.
1,800
÷
6
=
5.
+
5. 6.
+
5 9 6 10
=
=
5 9 5 10
+
+
8 9 7 10
=
6.
8 9 6 10
7.
5,385
+
2,452
=
7.
5,326
+
3,572
=
8.
6,741
–
4,650
=
8.
9,461
–
3,532
=
9.
23.4
+
13.8
equals
9.
21.4
+
17.3
equals
10.
21.4
–
13.8
=
10.
24.1
–
9.3
=
Wednesday
=
Thursday
1.
90
x
7
=
1.
30
x
7
=
2.
184
x
4
is equal to
2.
375
x
6
is equal to
3.
84
÷
4
=
3.
192
÷
6
=
4.
2,400
÷
6
=
4.
4,800
÷
6
=
5.
+
5. 6.
+
2 7 3 10
=
=
6 7 9 10
+
+
6 7 6 10
=
6.
2 7 6 10
7.
4,590
+
2,318
=
7.
7,305
+
2,710
=
8.
7,036
–
1,405
=
8.
8,905
–
2,590
=
9.
19.4
+
4.7
equals
9.
18.6
+
1.3
equals
10.
23.1
–
4.5
=
10.
20.2
–
2.7
=
Friday 1.
80
x
7
=
2.
624
x
6
is equal to
3.
126
÷
3
=
4.
8,100
÷
9
=
5.
+ +
6 8 9 14
=
6.
7 8 9 14
7.
8,373
+
1,935
=
8.
9,481
–
7,903
=
9.
9.3
+
8.9
equals
10.
10.4
–
3.5
=
118
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 118
=
Ninja challenge
Iko subtracts 14.3 from 23.6 and gets an answer of 12.5. Is Iko correct?
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
SHINOBI LEVEL
WEEK 38 Monday
Tuesday
1.
3.67
+
1.07
=
1.
4.67
+
2.67
=
2.
5.64
=
2.67
+
2.
8.24
=
2.67
+
3.
6.54
–
4.67
=
3.
9.14
–
3.67
=
4.
30
x
12
=
4.
40
x
8
=
5.
300
x
12
=
5.
400
x
8
=
6.
318
÷
2
=
6.
480
÷
5
=
7.
531
÷
9
=
7.
468
÷
6
=
8.
608
÷
8
=
8.
648
÷
3
=
9.
56
÷
10
=
9.
8
÷
10
=
10.
9
÷
100
=
10.
34
÷
100
=
Wednesday
Thursday
1.
3.56
+
3.75
=
1.
3.39
+
2.45
=
2.
8.41
=
3.56
+
2.
7.64
=
4.39
+
3.
9.11
–
3.56
=
3.
9.24
–
4.39
=
4.
60
x
6
=
4.
30
x
11
=
5.
60
x
60
=
5.
300
x
11
=
6.
560
÷
5
=
6.
965
÷
5
=
7.
608
÷
8
=
7.
592
÷
2
=
8.
544
÷
4
=
8.
388
÷
4
=
9.
83
÷
10
=
9.
46
÷
10
=
10.
83
÷
100
=
10.
46
÷
100
=
Friday 1.
2.45
+
1.57
=
2.
8.12
=
1.57
+
3.
9.02
–
1.57
=
4.
50
x
3
=
5.
50
x
30
=
6.
456
÷
6
=
7.
872
÷
8
=
8.
759
÷
3
=
9.
88
÷
10
=
10.
88
÷
100
=
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 119
Ninja challenge
Iko stated that 40 lots of 8 is equal to 400 less than 760. Is Iko correct? Explain why.
119
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 38 Monday 1.
15.4
=
2.
19.4
–
3. 4.
+ 7,475
13.6 1,001
=
Tuesday +
1.
24.4
=
13.5
–
=
10.9
2.
=
13,407
3.
–
1,010
4.
+ 8,202
17.5 1,100
=
+ =
3.9
=
14,373
–
1,001
5.
=
735
x
6
5.
=
827
x
7
6.
÷
10
=
49
6.
÷
10
=
49
7.
170
=
x
100
7.
450
=
x
100
8.
53
=
÷
8
8.
84
=
÷
8
9.
6 7 8 9
6 9 5 9
of
72
=
–
1 9
=
10.
of
14
=
9.
–
5 9
=
10.
Wednesday 1.
16.7
=
2.
11.5
–
3. 4.
+ 7,082
13.1 1,001
=
Thursday +
1.
25.1
=
13.6
–
=
4.8
2.
=
11,274
3.
–
2,201
4.
+ 9,193
14.6 1,201
=
+ =
4.7
=
12,405
–
1,101
5.
=
912
x
8
5.
=
903
x
8
6.
÷
10
=
49
6.
÷
10
=
51
7.
570
=
x
100
7.
670
=
x
100
8.
92
=
÷
8
8.
67
=
÷
9
9.
6 7 11 12
9.
5 9 18 19
of
27
=
–
7 19
=
10.
of
28
–
7 12
=
10.
=
Ninja challenge
Friday 1.
29.4
=
2.
15.6
–
3. 4.
+ 12,193
17.5 2,101
=
+ =
6.5
=
15,375
–
1,010
5.
=
563
x
9
6.
÷
10
=
41
7.
480
=
x
100
8.
48
=
÷
8
9.
6 7 9 12
of
42
=
–
7 12
=
10. 120
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 120
Tom multiplies the product of 12 times 9 by 7. What answer does Tom have?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRASSHOPPER LEVEL
WEEK 39 Monday
Tuesday
1.
600
x
7
=
1.
600
x
8
=
2.
274
x
9
=
2.
316
x
9
=
3.
189
÷
3
=
3.
208
÷
4
=
4.
7,200
÷
9
=
4.
3,600
÷
4
=
5.
+
=
5. 6.
+
3 8 6 14
=
=
of
360
=
7.
6 8 9 14 3 5
+
+
5 8 10 14
7.
4 8 5 14 3 4
of
250
=
8.
0.4
x
100
=
8.
0.9
x
100
=
9.
9.3
x
10
=
9.
7.3
x
10
=
10.
4.5
x
100
=
10.
2.1
x
100
=
6.
Wednesday
=
Thursday
1.
200
x
9
=
1.
400
x
9
=
2.
732
x
5
=
2.
814
x
6
=
3.
244
÷
4
=
3.
272
÷
4
=
4.
3,600
÷
6
=
4.
4,800
÷
8
=
5.
+
=
5. 6.
+
4 9 8 9
=
=
of
240
=
7.
8 9 3 9 3 9
+
+
4 9 6 9
7.
6 9 9 9 2 6
of
630
=
8.
0.1
x
100
=
8.
0.6
x
100
=
9.
9.9
x
10
=
9.
3.2
x
10
=
10.
4.5
x
100
=
10.
6.7
x
100
=
6.
Friday 1.
600
x
9
=
2.
953
x
4
=
3.
388
÷
4
=
4.
5,600
÷
8
=
5.
+
=
+
5 12 10 19
7.
9 12 10 19 3 7
of
210
=
8.
0.8
x
100
=
9.
9.6
x
10
=
10.
8.2
x
100
=
6.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 121
=
Ninja challenge
Tom says that the answer to 900 x 2 is 300 more than 1,600. Is Tom correct? Explain why.
=
121
15/09/2022 09:51
v
SHINOBI LEVEL
WEEK 39 Monday
Tuesday
1.
4.54
+
2.78
=
1.
1.09
+
2.67
=
2.
8.22
–
4.54
=
2.
4.86
–
2.19
=
3.
2.58
=
9.42
–
3.
3.19
=
5.86
–
4.
90
x
3
=
4.
20
x
9
=
5.
900
x
3
=
5.
200
x
9
=
6.
642
÷
6
=
6.
924
÷
4
=
7.
876
÷
2
=
7.
734
÷
2
=
8.
780
÷
5
=
8.
987
÷
3
=
9.
34
÷
10
=
9.
59
÷
10
=
10.
34
÷
100
=
10.
59
÷
100
=
Wednesday
Thursday
1.
2.78
+
5.35
=
1.
5.67
+
0.89
=
2.
7.23
–
2.78
=
2.
10.56
–
5.67
=
3.
2.78
=
6.43
–
3.
3.79
=
9.56
–
4.
40
x
6
=
4.
30
x
7
=
5.
400
x
6
=
5.
3
x
700
=
6.
574
÷
7
=
6.
384
÷
4
=
7.
816
÷
2
=
7.
178
÷
2
=
8.
405
÷
9
=
8.
960
÷
5
=
9.
67
÷
10
=
9.
48
÷
10
=
10.
67
÷
100
=
10.
48
÷
100
=
Friday 1.
7.85
+
0.79
=
2.
7.64
–
3.85
=
3.
2.85
=
6.94
–
4.
90
x
6
=
5.
900
x
6
=
6.
510
÷
6
=
7.
836
÷
2
=
8.
804
÷
3
=
9.
67
÷
10
=
10.
67
÷
100
=
122
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 122
Ninja challenge
Cho divides 680 by 10. She says the answer is less than 70, greater than 60 and is also an even number. What is the answer?
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:51
GRAND MASTER LEVEL
WEEK 39 Monday
Tuesday
1.
=
18.53
+
13.25
1.
=
20.12
+
9.34
2.
=
19.16
–
6.53
2.
=
17.36
–
8.17
3.
=
60
x
7
3.
=
50
x
9
4.
=
3,600
÷
600
4.
=
4,200
÷
600
5.
=
183
x
5
5.
=
254
x
5
6.
÷
10
=
63
6.
÷
10
=
71
7.
0.67
=
÷
10
7.
0.71
=
÷
10
8.
63
=
÷
5
8.
87
=
÷
6
9.
3 5 18 19
3 7 14 20
of
56
=
=
8 20
+
10.
of
35
=
9.
=
7 19
+
10.
Wednesday
Thursday
1.
=
21.26
+
8.25
1.
=
20.15
+
11.2
2.
=
15.26
–
7.34
2.
=
23.12
–
9.26
3.
=
60
x
8
3.
=
80
x
9
4.
=
4,900
÷
700
4.
=
7,200
÷
800
5.
=
352
x
8
5.
=
419
x
6
6.
÷
10
=
85
6.
÷
10
=
98
7.
0.84
=
÷
10
7.
0.62
=
÷
10
8.
57
=
÷
9
8.
97
=
÷
4
9.
3 5 17 20
9.
7 9 19 25
of
36
=
=
13 25
+
10.
of
45
=
11 20
=
10.
+
Friday 1.
=
21.26
+
12.45
2.
=
25.27
–
11.36
3.
=
60
x
9
4.
=
8,100
÷
900
5.
=
547
x
7
6.
÷
10
=
87
7.
0.92
=
÷
10
8.
78
=
÷
6
9.
8 9 21 25
of
27
=
=
15 25
+
10.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 123
Ninja challenge
Iko tells Sam that she has 63, and that 63 is equal to 89 of 72. Is Iko correct? Explain why.
123
15/09/2022 09:51
ANSWERS Week 1: Week 1: Grasshopper Shinobi Monday Monday
Week 1: Week 2: Week 2: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 2: Week 3: Week 3: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 3: Grand Master Monday
1. 180 2. 2,800 3. 30 4. 9 5. 215 6. 4 7. 8 8. 96 9. 11 12 10. 11 20
1. 574 2. 554 3. 544 4. 4 5. 10 6. 20 7. 27 8. 36 9. 57 10. 67
1. 3,712 2. 845 3. 3,471 4. 951 5. 502 6. 2,920 7. 54 8. 96 9. 5 10. 360
1. 445 2. 254 3. 173 4. 563 5. 24 6. 9 7. 9 8. 7 9. 68 or 34 4 10. 10 or 25
1. 847 2. 867 3. 877 4. 14 5. 35 6. 70 7. 36 8. 18 9 9. 10 8 10. 10 or 45
1. 3,473 2. 404 3. 2,374 4. 846 5. 118 6. 3,492 7. 54 8. 282 9. 7 10. 90
1. 411 2. 43 3. 378 4. 117 5. 8 6. 3 7. 60 8. 3 2 9. 14 or 17 1 10. 7
1. 3,693 2. 3,493 3. 3,393 4. 6 5. 8 6. 2 7. 12 8. 24 9. 49 10. 29
1. 4,372 2. 1,263 3. 3,472 4. 382 5. 170 6. 18 7. 16 8. 12 12 or 1 9. 36 10. 1,284
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 280 2. 2,500 3. 90 4. 9 5. 224 6. 5 7. 10 8. 116 6 9. 12 or 12 3 10. 20
1. 743 2. 763 3. 773 4. 6 5. 12 6. 30 7. 60 8. 30 9. 58 10. 78
1. 4,741 2. 737 3. 4,261 4. 839 5. 729 6. 2,473 7. 56 8. 216 9. 4 10. 250
1. 272 2. 365 3. 174 4. 564 5. 18 6. 9 7. 16 8. 5 9. 58 4 10. 11
1. 635 2. 615 3. 605 4. 16 5. 40 6. 80 7. 72 8. 48 9 9. 11 10. 10 11
1. 2,361 2. 836 3. 3,413 4. 1,328 5. 257 6. 4,382 7. 35 8. 371 9. 6 10. 80
1. 501 2. 262 3. 81 4. 290 5. 6 6. 3 7. 160 8. 4 5 9. 10 14 or 7 10. 37
1. 2,634 2. 2,834 3. 2,934 4. 9 5. 12 6. 3 7. 30 8. 45 5 9. 12 4 10. 12 or 13
1. 5,304 2. 2,663 3. 5,382 4. 736 5. 504 6. 72 7. 36 or 12 8 8. 12 or 23 9. 12 10. 696
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 350 2. 6,400 3. 10 4. 8 5. 189 6. 4 7. 8 8. 240 9 9. 11 4 10. 20 or 15
1. 593 2. 573 3. 563 4. 8 5. 20 6. 40 7. 12 8. 24 9. 89 10. 89
1. 4,419 2. 228 3. 4,710 4. 374 5. 670 6. 3,472 7. 48 8. 260 9. 6 10. 480
1. 767 2. 631 3. 303 4. 499 5. 14 6. 4 7. 64 8. 5 9. 68 or 34 2 10. 12 or 16
1. 733 2. 753 3. 763 4. 18 5. 45 6. 90 7. 60 8. 30 9. 11 18 2 10. 12 18 or 3
1. 3,121 2. 785 3. 4,104 4. 2,374 5. 739 6. 6,482 7. 42 8. 432 9. 8 10. 50
1. 126 2. 7 3. 104 4. 109 5. 30 6. 5 7. 150 8. 6 9 9. 13 10. 47
1. 2,585 2. 2,385 3. 2,285 4. 12 5. 16 6. 4 7. 50 8. 40 8 9. 12 or 23 2 10. 12 or 16
1. 6,477 2. 3,004 3. 5,573 4. 943 5. 248 6. 49 7. 24 or 12 8. 12 13 9. 25 10. 1,305
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 560 2. 4,800 3. 50 4. 9 5. 296 6. 7 7. 14 8. 111 7 9. 10 6 3 10. 20 or 10
1. 385 2. 395 3. 365 4. 10 5. 25 6. 50 7. 40 8. 80 9 9. 12 or 34 5 10. 10 12 or 6
1. 2,552 2. 187 3. 4,502 4. 846 5. 319 6. 4,572 7. 49 8. 371 9. 6 10. 480
1. 582 2. 363 3. 490 4. 453 5. 22 6. 9 7. 24 8. 2 9. 89 10. 15
1. 555 2. 535 3. 525 4. 20 5. 50 6. 100 7. 72 8. 72 9. 14 15 10. 13 15
1. 4,829 2. 205 3. 5,372 4. 1,379 5. 671 6. 7,372 7. 48 8. 486 9. 9 10. 40
1. 198 2. 173 3. 362 4. 117 5. 21 6. 7 7. 280 8. 2 9. 12 13 10. 18
1. 5,386 2. 5,586 3. 5,686 4. 15 5. 20 6. 5 7. 96 8. 48 6 9. 15 5 10. 15 or 13
1. 6,517 2. 4,807 3. 6,403 4. 1,001 5. 370 6. 28 2 7. 14 or 17 8. 11 13 9. 18 10. 873
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 200 2. 1,600 3. 90 4. 8 5. 320 6. 3 7. 6 8. 81 2 9. 10 or 15 9 10. 18 20 or 10
1. 853 2. 833 3. 823 4. 12 5. 30 6. 60 7. 12 8. 18 9 9. 11 10. 10 11
1. 3,882 2. 307 3. 4,372 4. 642 5. 468 6. 4,394 7. 45 8. 312 9. 7 10. 180
1. 573 2. 84 3. 78 4. 217 5. 12 6. 6 7. 24 8. 3 9. 29 10. 15
1. 935 2. 955 3. 965 4. 22 5. 55 6. 110 7. 54 8. 48 9. 18 19 10. 17 19
1. 5,823 2. 586 3. 6,007 4. 2,365 5. 521 6. 8,362 7. 30 8. 304 9. 6 10. 40
1. 263 2. 704 3. 809 4. 101 5. 16 6. 10 7. 250 8. 10 6 9. 13 10. 28 or 14
1. 7,693 2. 7,493 3. 7,393 4. 18 5. 24 6. 6 7. 36 8. 27 7 9. 20 3 10. 20
1. 5,005 2. 3,948 3. 7,382 4. 3,932 5. 378 6. 49 7 7. 14 or 17 8. 10 13 9. 21 10. 912
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
83
Yes, 7 x 20 = 140.
No, 200 more than 1,236 is 1,436.
No, he has 100 counters, 5 x 20 = 100
Yes, half of 200 is 100 and double 50 is 100.
3,912
50
30
No, 7 x 9 = 63 and 6 x 11 = 66.
124
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ANSWERS Week 4: Week 4: Grasshopper Shinobi Monday Monday
Week 4: Week 5: Week 5: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 5: Week 6: Week 6: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 6: Grand Master Monday
1. 372 2. 354 3. 164 4. 199 5. 65 6. 238 7. 239 8. 6 9 9. 13 3 10. 8
1. 8,683 2. 8,483 3. 8,383 4. 21 5. 28 6. 7 7. 30 8. 56 9. 14 25 6 10. 25
1. 2,348 2. 1,263 3. 1,373 4. 1,768 5. 324 6. 0.4 5 7. 14 4 8. 13 9. 18 10. 60
1. 297 2. 117 3. 113 4. 341 5. 39 6. 130 7. 84 8. 12 9. 15 10. 35
1. 8,458 2. 8,448 3. 100 4. 15 5. 4 6. 5 7. 4 8. 2 9. 13 20 8 10. 20 or 25
1. 2,642 2. 2,617 3. 2,364 4. 48 5. 312 6. 0.5 7 7. 16 3 8. 12 or 14 9. 30 10. 140
1. 353 2. 221 3. 232 4. 542 5. 138 6. 15 7. 28 8. 56 9. 120 10. 250
1. 3,696 2. 3,586 3. 100 4. 32 5. 64 6. 40 7. 5 8. 2 8 9. 16 26 or 13 7 10. 26
1. 900 2. 2,163 3. 600 4. 360 5. 115 6. 5 7. 14 15 7 8. 22 9. 24 10. 4
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 874 2. 103 3. 212 4. 521 5. 77 6. 271 7. 281 8. 2 9. 15 10. 29
1. 3,584 2. 3,784 3. 3,884 4. 24 5. 32 6. 8 7. 80 8. 100 9. 14 30 10. 19 30
1. 1,030 2. 1,102 3. 734 4. 3,421 5. 420 6. 0.7 3 7. 15 or 15 6 8. 19 9. 28 10. 80
1. 314 2. 184 3. 83 4. 118 5. 53 6. 59 7. 181 8. 24 9. 45 10. 36
1. 5,345 2. 5,555 3. 100 4. 18 5. 6 6. 6 7. 3 8. 2 9. 23 25 10. 14 25
1. 3,892 2. 3,984 3. 1,782 4. 36 5. 415 6. 0.7 1 7. 16 9 8. 12 or 34 9. 30 10. 100
1. 841 2. 331 3. 269 4. 574 5. 154 6. 42 7. 16 8. 40 9. 150 10. 240
1. 6,383 2. 6,493 3. 100 4. 36 5. 72 6. 45 7. 4 8. 3 4 9. 16 36 or 9 7 10. 36
1. 500 2. 3,264 3. 700 4. 180 5. 315 6. 4 9 7. 15 or 35 7 8. 22 9. 16 10. 3
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 191 2. 73 3. 103 4. 303 5. 91 6. 311 7. 192 8. 7 9. 35 10. 39
1. 2,757 2. 2,557 3. 2,457 4. 27 5. 36 6. 9 7. 18 8. 24 8 9. 17 2 10. 17
1. 1,372 2. 1,294 3. 816 4. 1,057 5. 228 6. 0.9 5 7. 15 or 13 6 8. 19 9. 45 10. 40
1. 364 2. 364 3. 181 4. 132 5. 24 6. 171 7. 91 8. 28 9. 40 10. 27
1. 4,643 2. 4,533 3. 100 4. 21 5. 7 6. 7 7. 5 8. 4 9. 29 32 10. 19 32
1. 3,372 2. 3,924 3. 1,037 4. 45 5. 372 6. 0.6 7. 11 15 9 8. 22 9. 28 10. 180
1. 683 2. 227 3. 313 4. 685 5. 134 6. 114 7. 20 8. 72 9. 450 10. 300
1. 2,443 2. 2,333 3. 100 4. 40 5. 80 6. 50 7. 2 8. 2 9. 29 42 10. 27 42
1. 600 2. 1,437 3. 800 4. 280 5. 657 6. 8 7. 13 15 7 8. 18 9. 50 10. 10
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 141 2. 111 3. 99 4. 199 5. 92 6. 406 7. 172 8. 7 9. 46 or 23 10. 26 or 13
1. 2,486 2. 2,686 3. 2,786 4. 30 5. 40 6. 10 7. 80 8. 100 5 9. 10 24 or 12 1 10. 12 or 24 2
1. 1,283 2. 984 3. 904 4. 2,013 5. 234 6. 0.1 2 7. 10 15 or 3 7 8. 19 9. 10 10. 70
1. 352 2. 191 3. 297 4. 217 5. 27 6. 91 7. 61 8. 36 9. 35 10. 21
1. 6,684 2. 6,794 3. 100 4. 24 5. 8 6. 8 7. 2 8. 2 9. 21 22 8 10. 22
1. 2,374 2. 4,751 3. 904 4. 42 5. 335 6. 0.2 8 7. 15 8 4 8. 22 or 11 9. 16 10. 240
1. 984 2. 371 3. 124 4. 895 5. 123 6. 91 7. 12 8. 24 9. 240 10. 210
1. 6,634 2. 6,744 3. 100 4. 44 5. 88 6. 55 7. 3 8. 5 9. 27 40 3 10. 30 40 or 4
1. 900 2. 1,754 3. 600 4. 250 5. 396 6. 9 4 7. 12 15 or 5 7 8. 19 9. 25 10. 5
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 753 2. 354 3. 53 4. 664 5. 81 6. 416 7. 276 8. 3 9. 98 or 1 18 10. 16
1. 8,964 2. 8,764 3. 8,664 4. 33 5. 44 6. 11 7. 72 8. 60 7 9. 27 8 10. 27
1. 1,462 2. 945 3. 1,028 4. 3,263 5. 258 6. 0.5 9 7. 16 7 8. 11 9. 24 10. 110
1. 654 2. 212 3. 382 4. 51 5. 54 6. 160 7. 212 8. 20 9. 45 10. 24
1. 8,683 2. 8,573 3. 100 4. 27 5. 9 6. 9 7. 2 8. 3 9. 21 27 8 10. 27
1. 1,862 2. 5,833 3. 1,150 4. 36 5. 238 6. 0.3 5 7. 15 or 13 7 8. 22 9. 20 10. 160
1. 784 2. 265 3. 269 4. 517 5. 144 6. 190 7. 28 8. 48 9. 450 10. 640
1. 7,664 2. 7,554 3. 100 4. 48 5. 96 6. 60 7. 10 8. 3 9. 17 40 7 10. 14 40 or 20
1. 300 2. 2,306 3. 900 4. 280 5. 348 6. 1 7. 11 15 6 8. 19 9. 27 10. 7
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
60
2,175
No, 3,407 is 1,000 more than 2,407.
Yes, 123 + 242 = 365.
No, 7 x 8 = 56.
80
No, 9 groups of No, 100 less No, 6 x 254 = 3 = 27. than 904 is 804, 1,524 which is less than 805.
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ANSWERS Week 7: Week 7: Grasshopper Shinobi Monday Monday
Week 7: Week 8: Week 8: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 8: Week 9: Week 9: Grand Master Grasshopper Shinobi Monday Monday Monday
1. 226 2. 119 3. 74 4. 584 5. 277 6. 141 7. 9 8. 3 9. 30 10. 30
1. 6,697 2. 9,297 3. 1,997 4. 3,423 5. 8,242 6. 12 7. 1,200 8. 1,200 9. 6 10. 5
1. 603 2. 600 3. 2,093 4. 600 5. 522 6. 1,605 1 7. 14 9 8. 12 9. 30 10. 5
1. 440 2. 58 3. 294 4. 243 5. 80 6. 5 7. 8 8. 8 9. 60 10. 60
1. 7,707 2. 3,707 3. 5,007 4. 5,694 5. 3,583 6. 16 7. 160 8. 1,600 9. 7 10. 8
1. 1,775 2. 1,284 3. 56 4. 6 5. 498 6. 870 3 7. 14 3 8. 12 or 14 9. 21 10. 4
1. 34 2. 6 3. 557 4. 764 5. 46 6. 102 7. 7 8. 4 9. 80 10. 90
Week 9: Grand Master Monday
1. 5,094 2. 4,068 3. 6,968 4. 600 5. 9 6. 24 7. 240 8. 2,400 9. 4 10. 7
1. 900 2. 3 3. 225 4. 4 5. 93 6. 543 8 7. 12 or 23 5 8. 21 9. 30 10. 2,500
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 2,407 2. 5,507 3. 2,007 4. 2,562 5. 9,739 6. 15 7. 150 8. 1,500 9. 8 10. 7
1. 434 2. 500 3. 1,203 4. 300 5. 315 6. 1,260 4 7. 14 or 27 2 8. 12 or 16 9. 40 10. 10
1. 302 2. 158 3. 183 4. 301 5. 200 6. 30 7. 8 8. 11 9. 40 10. 45
1. 7,799 2. 4,299 3. 5,999 4. 7,932 5. 5,079 6. 27 7. 270 8. 2,700 9. 9 10. 11
1. 1,805 2. 1,367 3. 90 4. 6 5. 496 6. 500 3 7. 14 3 8. 12 or 14 9. 27 10. 6
1. 24 or 12 2. 5 3. 373 4. 652 5. 140 6. 126 7. 12 8. 9 9. 60 10. 100
Tuesday
1. 254 2. 91 3. 238 4. 474 5. 379 6. 210 7. 9 8. 7 9. 30 10. 40
1. 4,996 2. 5,925 3. 8,912 4. 8,000 5. 500 6. 42 7. 420 8. 4,200 9. 4 10. 12
1. 400 2. 6 3. 168 4. 9 5. 67 6. 364 9 7. 12 6 8. 21 9. 18 10. 1,800
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 5,197 2. 4,297 3. 5,997 4. 8,398 5. 7,513 6. 24 7. 240 8. 2,400 9. 3 10. 12
1. 623 2. 700 3. 2,039 4. 500 5. 414 6. 1,664 5 7. 14 3 8. 12 or 14 9. 50 10. 3
1. 335 2. 42 3. 93 4. 259 5. 160 6. 60 7. 9 8. 9 9. 50 10. 32
1. 7,506 2. 3,606 3. 8,006 4. 3,570 5. 5,209 6. 9 7. 90 8. 900 9. 4 10. 6
1. 1,739 2. 1,572 3. 135 4. 8 5. 528 6. 1,820 9 7. 15 or 35 3 8. 12 or 14 9. 54 10. 9
1. 45 2. 4 3. 637 4. 941 5. 246 6. 170 7. 9 8. 2 9. 120 10. 200
Wednesday
1. 281 2. 193 3. 112 4. 483 5. 223 6. 99 7. 5 8. 7 9. 70 10. 40
1. 8,053 2. 4,001 3. 1,904 4. 3 5. 800 6. 36 7. 360 8. 3,600 9. 3 10. 6
1. 500 2. 6 3. 252 4. 8 5. 56 6. 157 4 7. 12 or 13 3 8. 21 or 17 9. 18 10. 3,500
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 1,507 2. 3,507 3. 5,007 4. 5,437 5. 2,941 6. 21 7. 210 8. 2,100 9. 6 10. 8
1. 581 2. 300 3. 2,472 4. 900 5. 312 6. 2,115 3 7. 14 2 8. 12 or 16 9. 14 10. 11
1. 397 2. 99 3. 63 4. 138 5. 180 6. 22 7. 5 8. 3 9. 80 10. 120
1. 8,497 2. 3,797 3. 3,997 4. 2,405 5. 6,076 6. 8 7. 80 8. 800 9. 11 10. 9
1. 1,781 2. 2,255 3. 294 4. 8 5. 372 6. 1,476 4 7. 15 4 8. 12 or 13 9. 42 10. 1
5 1. 10 12 or 6 2. 9 3. 156 4. 551 5. 116 6. 78 7. 11 8. 9 9. 24 10. 120
Thursday
1. 301 2. 259 3. 363 4. 684 5. 308 6. 220 7. 8 8. 9 9. 90 10. 60
1. 2,998 2. 8,014 3. 9,067 4. 3,000 5. 500 6. 30 7. 300 8. 3,000 9. 4 10. 12
1. 900 2. 5 3. 315 4. 8 5. 87 6. 352 4 7. 12 15 or 5 7 8. 24 9. 27 10. 4,200
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 8,599 2. 5,599 3. 7,999 4. 6,236 5. 9,163 6. 18 7. 180 8. 1,800 9. 7 10. 12
1. 548 2. 800 3. 1,904 4. 600 5. 335 6. 1,408 2 7. 14 or 17 2 8. 12 or 16 9. 28 10. 9
1. 421 2. 27 3. 84 4. 273 5. 240 6. 25 7. 5 8. 5 9. 30 10. 80
1. 5,808 2. 6,608 3. 6,008 4. 5,326 5. 7,468 6. 18 7. 180 8. 1,800 9. 12 10. 9
1. 1,560 2. 1,241 3. 240 4. 4 5. 504 6. 1,911 4 7. 13 4 8. 17 9. 36 10. 5
1. 11 12 2. 9 3. 63 4. 927 5. 108 6. 120 7. 7 8. 6 9. 28 10. 36
Friday
1. 321 2. 195 3. 124 4. 886 5. 276 6. 49 7. 12 8. 12 9. 30 10. 70
1. 6,083 2. 5,956 3. 7,098 4. 700 5. 9 6. 33 7. 330 8. 330 9. 6 10. 12
1. 500 2. 5 3. 144 4. 6 5. 74 6. 187 4 7. 17 8. 17 25 9. 24 10. 2,100
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
119
No, 6,002 – 10 = 5,992.
2,406
No, 120 less than 187 is 67.
Yes, both are equal to 100.
1,267
Iko has more; Yes, 847 – 300 36 x 2 = 72, half = 547. of 140 is 70.
126
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ANSWERS Week 10: Week 10: Grasshopper Shinobi Monday Monday
Week 10: Week 11: Week 11: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 11: Week 12: Week 12: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 12: Grand Master Monday
1. 78 2. 7 3. 56 4. 10 5. 85 6. 57 7. 7 8. 7 9. 174 10. 12
1. 8,954 2. 7,099 3. 8,032 4. 3 5. 600 6. 45 7. 450 8. 4,500 9. 8 10. 7
1. 300 2. 7 3. 288 4. 3 5. 56 6. 362 7. 14 17 8. 16 25 9. 8 10. 3,200
1. 79 2. 5 7 3. 17 4. 8 5. 128 6. 35 7. 5 8. 9 9. 424 10. 22
1. 3,606 2. 3,496 3. 4,596 4. 4,564 5. 7,546 6. 6 7. 60 8. 600 9. 8 10. 9
1. 3,203 2. 2,869 3. 2,400 4. 80 5. 60 6. 3,600 7. 320 7 8. 15 3 9. 14 10. 30
3 1. 13 2. 3 3. 11 15 4. 18 5. 252 6. 24 7. 334 8. 126 9. 692 10. 28
1. 7,794 2. 7,904 3. 6,804 4. 4,795 5. 9,530 6. 9 7. 90 8. 900 9. 12 10. 4
1. 49 2. 8 3. 1,200 4. 3,000 5. 240 6. 1,524 7. 24 8. 15 19 3 9. 12 or 13 10. 12
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 5,954 2. 6,064 3. 4,964 4. 4,589 5. 8,342 6. 2 7. 20 8. 200 9. 2 10. 11
1. 3,133 2. 2,374 3. 4,500 4. 70 5. 30 6. 2,700 7. 140 4 8. 12 15 or 5 2 9. 14 or 17 10. 32
1 1. 14 2. 4 6 3. 15 4. 12 5. 195 6. 32 7. 275 8. 286 9. 745 10. 19
Tuesday
1. 700 2. 9 3. 324 4. 7 5. 47 6. 563 7. 10 17 3 8. 15 25 or 5 9. 36 10. 7,200
6 1. 20 or 35 2. 6 7 3. 12 4. 6 5. 155 6. 36 7. 5 8. 6 9. 537 10. 33
Tuesday
1. 9,043 2. 7,915 3. 5,943 4. 9,000 5. 90 6. 72 7. 720 8. 7,200 9. 2 10. 9
1. 8,106 2. 7,996 3. 9,096 4. 7,590 5. 4,805 6. 7 7. 70 8. 700 9. 12 10. 8
1. 48 2. 8 3. 1,800 4. 1,400 5. 420 6. 1,185 7. 32 8. 11 19 4 9. 12 or 13 10. 12
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 7,694 2. 7,584 3. 8,684 4. 6,894 5. 8,563 6. 8 7. 80 8. 800 9. 9 10. 4
1. 3,516 2. 3,615 3. 3,600 4. 30 5. 30 6. 3,500 7. 180 8 8. 11 7 9. 19 10. 14
1. 47 2. 5 8 3. 11 4. 21 5. 171 6. 45 7. 658 8. 227 9. 491 10. 23
Wednesday
1. 900 2. 1 3. 220 4. 7 5. 78 6. 624 7. 15 17 8 8. 25 9. 18 10. 4,200
5 1. 12 2. 3 4 3. 13 4. 20 5. 184 6. 36 7. 7 8. 10 9. 426 10. 23
Wednesday
1. 8,934 2. 7,085 3. 4,089 4. 700 5. 7,000 6. 36 7. 360 8. 3,600 9. 6 10. 3
1. 3,892 2. 4,002 3. 2,902 4. 5,533 5. 4,639 6. 4 7. 40 8. 400 9. 3 10. 6
1. 45 2. 12 3. 2,800 4. 5,400 5. 280 6. 552 7. 43 8. 17 19 2 9. 12 or 16 10. 35
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 8,493 2. 8,603 3. 7,503 4. 7,604 5. 3,849 6. 6 7. 60 8. 600 9. 6 10. 12
1. 3,410 2. 3,879 3. 5,400 4. 80 5. 30 6. 6,400 7. 210 9 8. 11 8 9. 19 10. 44
1. 37 2. 12 7 3. 11 4. 28 5. 108 6. 24 7. 541 8. 112 9. 432 10. 28
Thursday
1. 500 2. 2 3. 224 4. 7 5. 87 6. 834 8 7. 16 18 or 9 5 8. 25 or 15 9. 20 10. 4,500
9 1. 19 2. 4 5 3. 13 4. 10 5. 184 6. 18 7. 4 8. 8 9. 392 10. 15
Thursday
1. 3,067 2. 6,945 3. 4,999 4. 5,000 5. 800 6. 36 7. 360 8. 360 9. 3 10. 2
1. 4,107 2. 3,997 3. 5,097 4. 5,967 5. 8,453 6. 8 7. 80 8. 800 9. 5 10. 10
1. 32 2. 5 3. 4,900 4. 1,200 5. 350 6. 1,576 7. 56 8. 19 20 6 9. 14 or 37 10. 56
Friday
Friday
Friday
Friday
Friday
Friday
1. 6,953 2. 6,843 3. 7,943 4. 4,693 5. 6,084 6. 8 7. 80 8. 800 9. 8 10. 3
1. 3,641 2. 5,614 3. 4,200 4. 40 5. 60 6. 2,400 7. 360 6 8. 11 5 9. 19 10. 16
1. 37 2. 8 3. 10 11 4. 12 5. 170 6. 30 7. 744 8. 111 9. 557 10. 23
Friday
1. 700 2. 3 3. 360 4. 7 5. 94 6. 785 7. 17 18 1 8. 21 9. 30 10. 4,200
8 1. 19 2. 6 6 3. 13 4. 4 5. 280 6. 24 7. 6 8. 5 9. 468 10. 16
Friday
1. 6,955 2. 8,067 3. 4,003 4. 9 5. 700 6. 48 7. 480 8. 480 9. 7 10. 11
1. 7,896 2. 8,006 3. 6,906 4. 5,340 5. 5,056 6. 12 7. 120 8. 1,200 9. 6 10. 12
1. 24 2. 7 3. 6,300 4. 4,000 5. 540 6. 1,235 7. 46 8. 13 20 4 9. 14 or 27 10. 6
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
614
Yes, 4 x 90 = 360.
900
Yes, both equal Yes, the 8. difference is 3,572.
46
Yes, both equal Yes, 360 144. divided by 4 = 90.
1. 68 or 34 2. 4 3. 46 or 23 4. 12 5. 72 6. 115 7. 6 8. 6 9. 196 10. 29
Wednesday 1. 78 2. 3 3. 56 4. 30 5. 95 6. 112 7. 5 8. 12 9. 234 10. 11
Thursday 1. 89 2. 9 3. 13 17 4. 15 5. 138 6. 184 7. 9 8. 12 9. 276 10. 25
Friday
1. 79 2. 9 3. 15 17 4. 18 5. 69 6. 126 7. 5 8. 9 9. 392 10. 39
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ANSWERS Week 13: Week 13: Grasshopper Shinobi Monday Monday
Week 13: Week 14: Week 14: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 14: Week 15: Week 15: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 15: Grand Master Monday
1. 236 2. 91 9 3. 11 4. 8 5. 129 6. 20 7. 18 8. 36 9. 40 10. 2
1. 5,261 2. 4,961 3. 6 4. 60 5. 600 6. 1,038 7. 1,730 8. 8 9. 32 10. 56
1. 9 2. 56 3. 60 4. 40 5. 300 6. 676 7. 282 8 8. 20 or 25 7 9. 14 or 12 10. 24
1. 447 2. 213 3. 13 4. 12 5. 108 6. 16 7. 90 8. 90 9. 8 10. 90
1. 5,378 2. 4,178 3. 7 4. 70 5. 700 6. 2,304 7. 3,840 8. 7 9. 35 10. 49
1. 72 2. 12 3. 90 4. 70 5. 4 6. 552 7. 344 8. 49 9. 15 16 10. 24
1. 664 2. 191 3. 11 17 4. 20 5. 174 6. 18 7. 150 8. 1,200 9. 60 10. 400
1. 3,900 2. 4,899 3. 27 4. 2,700 5. 30 6. 2,106 7. 2,808 8. 12 9. 30 10. 42
1. 9 2. 3 3. 60 4. 90 5. 5 6. 615 7. 747 8. 14 23 9. 18 19 10. 20
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 254 2. 123 8 3. 11 4. 16 5. 152 6. 48 7. 14 8. 45 9. 50 10. 5
1. 8,271 2. 7,971 3. 6 4. 60 5. 600 6. 1,346 7. 2,692 8. 7 9. 21 10. 28
1. 7 2. 45 3. 80 4. 50 5. 420 6. 1,270 7. 420 4 8. 20 or 15 9 9. 14 10. 25
1. 447 2. 129 3. 57 4. 21 5. 180 6. 21 7. 36 8. 200 9. 6 10. 50
1. 5,056 2. 3,856 3. 11 4. 110 5. 1,100 6. 1,812 7. 906 8. 3 9. 15 10. 21
1. 48 2. 6 3. 70 4. 50 5. 5 6. 1,365 7. 450 8. 39 or 13 9. 15 17 10. 16
1. 863 2. 175 3. 10 17 4. 27 5. 144 6. 40 7. 280 8. 1,500 9. 70 10. 300
1. 6,729 2. 7,929 3. 12 4. 1,200 5. 4 6. 1,848 7. 2,376 8. 14 9. 35 10. 49
1. 5 2. 6 3. 60 4. 90 5. 8 6. 2,295 7. 414 8. 10 23 9. 17 19 10. 32
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 367 2. 249 9 3. 12 or 34 4. 30 5. 275 6. 56 7. 18 8. 18 9. 30 10. 4
1. 8,930 2. 7,730 3. 8 4. 80 5. 800 6. 1,092 7. 1,456 8. 8 9. 24 10. 48
1. 9 2. 81 3. 80 4. 50 5. 270 6. 2,184 7. 380 4 8. 25 12 9. 16 or 34 10. 27
1. 538 2. 74 3. 27 4. 6 5. 335 6. 16 7. 64 8. 140 9. 5 10. 90
1. 7,797 2. 6,397 3. 7 4. 70 5. 700 6. 3,225 7. 1,935 8. 7 9. 28 10. 35
1. 36 2. 3 3. 20 4. 30 5. 3 6. 2,070 7. 336 8. 59 9. 12 17 10. 49
1. 573 2. 716 3. 14 17 4. 10 5. 272 6. 27 7. 180 8. 1,800 9. 40 10. 700
1. 3,079 2. 3,979 3. 24 4. 240 5. 400 6. 4,098 7. 6,147 8. 24 9. 60 10. 84
1. 12 2. 6 3. 30 4. 80 5. 7 6. 4,375 7. 408 11 8. 22 34 or 17 19 9. 21 10. 24
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 265 2. 157 5 3. 10 12 or 6 4. 36 5. 192 6. 32 7. 12 8. 10 9. 4 10. 10
1. 7,271 2. 8,471 3. 3 4. 30 5. 300 6. 1,146 7. 2,865 8. 3 9. 9 10. 18
1. 8 2. 63 3. 60 4. 80 5. 490 6. 2,905 7. 204 2 8. 25 6 9. 16 or 38 10. 9
1. 505 2. 101 3. 57 4. 33 5. 272 6. 20 7. 25 8. 240 9. 9 10. 40
1. 5,898 2. 6,698 3. 8 4. 80 5. 800 6. 1,464 7. 3,660 8. 8 9. 40 10. 56
1. 42 2. 5 3. 80 4. 30 5. 7 6. 2,982 7. 399 8. 48 or 12 9. 13 16 10. 21
1. 919 2. 184 3. 17 19 4. 30 5. 216 6. 12 7. 200 8. 1,600 9. 90 10. 500
1. 5,789 2. 6,889 3. 15 4. 150 5. 500 6. 1,911 7. 2,457 8. 24 9. 60 10. 84
1. 11 2. 7 3. 30 4. 60 5. 9 6. 2,304 7. 570 10 8. 20 34 or 17 15 9. 21 or 57 10. 10
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 273 2. 70 3. 79 4. 9 5. 219 6. 16 7. 40 8. 40 9. 40 10. 20
1. 7,059 2. 3,859 3. 4 4. 40 5. 400 6. 2,716 7. 2,037 8. 4 9. 16 10. 28
1. 8 2. 108 3. 90 4. 70 5. 160 6. 2,492 7. 365 8. 59 7 9. 14 16 or 8 10. 36
1. 584 2. 131 3. 27 4. 24 5. 92 6. 12 7. 60 8. 480 9. 12 10. 60
1. 7,348 2. 4,648 3. 4 4. 40 5. 400 6. 1,305 7. 1,740 8. 4 9. 32 10. 36
1. 63 2. 9 3. 60 4. 30 5. 5 6. 1,950 7. 520 8. 18 9. 11 16 10. 6
1. 947 2. 146 3. 18 19 4. 27 5. 260 6. 45 7. 240 8. 1,800 9. 90 10. 900
1. 3,717 2. 4,917 3. 32 4. 320 5. 400 6. 2,094 7. 2,792 8. 16 9. 40 10. 48
1. 8 2. 6 3. 60 4. 50 5. 3 6. 2,214 7. 595 8. 15 34 9. 20 21 10. 10
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
36
No, 153 x 3 = 459.
6,226
323
No, 153 x 3 = 459.
300
452 seconds
5
Yes
128
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ANSWERS Week 16: Week 16: Grasshopper Shinobi Monday Monday
Week 16: Week 17: Week 17: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 17: Week 18: Week 18: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 18: Grand Master Monday
1. 1,379 2. 1,702 9 3. 19 4. 18 5. 210 6. 21 7. 320 8. 3,000 9. 90 10. 900
1. 5,997 2. 5,897 3. 36 4. 360 5. 400 6. 1,704 7. 2,556 8. 24 9. 56 10. 72
1. 4 2. 9 3. 40 4. 80 5. 5 6. 1,692 7. 336 8. 32 9. 3,600 10. 2,000
1. 36 2. 36 3. 7 4. 6 5. 150 6. 48 7. 270 8. 1,400 9. 100 10. 700
1. 678 2. 5,173 3. 24 4. 80 5. 3 6. 2,584 7. 5,814 8. 14 9. 16 10. 18
1. 42 2. 108 3. 12 4. 140 5. 40 6. 900 7. 1,500 8. 90 9. 489 10. 476
1. 56 2. 42 3. 6 4. 4 5. 3 6. 2 7. 2 8. 2,800 9. 30 10. 300
1. 1,956 2. 8,450 3. 72 4. 60 5. 6 6. 2,562 7. 6,832 8. 24 9. 12 10. 6
1. 3 2. 5 3. 3 4. 5 5. 350 6. 30 7. 500 8. 75 9. 1,016 10. 4,392
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 1,854 2. 1,526 1 3. 10 20 or 2 4. 9 5. 288 6. 40 7. 300 8. 4,000 9. 70 10. 1,200
1. 5,704 2. 3,704 3. 27 4. 270 5. 30 6. 4,501 7. 5,144 8. 21 9. 49 10. 63
1. 4 2. 5 3. 80 4. 80 5. 9 6. 1,644 7. 432 8. 56 9. 1,500 10. 2,700
1. 56 2. 63 3. 9 4. 7 5. 224 6. 72 7. 210 8. 1,800 9. 50 10. 800
1. 1,483 2. 7,944 3. 45 4. 5 5. 9 6. 1,925 7. 3,080 8. 27 9. 36 10. 9
1. 72 2. 84 3. 7 4. 240 5. 90 6. 1,800 7. 4,200 8. 184 9. 1,155 10. 3,138
1. 72 2. 56 3. 3 4. 6 5. 4 6. 4 7. 4 8. 3,500 9. 40 10. 700
1. 968 2. 6,283 3. 18 4. 60 5. 6 6. 2,328 7. 3,492 8. 30 9. 45 10. 60
1. 12 2. 7 3. 9 4. 7 5. 450 6. 80 7. 500 8. 168 9. 549 10. 4,944
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 1,586 2. 1,132 9 3. 20 4. 14 5. 178 6. 24 7. 180 8. 1,600 9. 110 10. 500
1. 4,332 2. 2,132 3. 24 4. 240 5. 1,200 6. 4,044 7. 4,718 8. 24 9. 80 10. 72
1. 6 2. 9 3. 90 4. 50 5. 9 6. 2,527 7. 520 8. 30 9. 2,500 10. 4,200
1. 48 2. 42 3. 5 4. 6 5. 336 6. 48 7. 420 8. 6,400 9. 90 10. 700
1. 869 2. 5,465 3. 32 4. 40 5. 4 6. 4,788 7. 2,052 8. 40 9. 15 10. 60
1. 42 2. 108 3. 9 4. 320 5. 120 6. 2,700 7. 2,000 8. 171 9. 692 10. 4,375
1. 72 2. 64 3. 9 4. 8 5. 6 6. 7 7. 9 8. 3,600 9. 60 10. 900
1. 754 2. 7,538 3. 42 4. 70 5. 7 6. 5,751 7. 1,278 8. 15 9. 35 10. 45
1. 12 2. 4 3. 12 4. 9 5. 250 6. 80 7. 600 8. 170 9. 789 10. 3,395
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 1,682 2. 1,121 8 3. 12 or 23 4. 21 5. 272 6. 40 7. 280 8. 6,400 9. 80 10. 700
1. 4,906 2. 3,106 3. 56 4. 560 5. 700 6. 6,016 7. 6,768 8. 27 9. 45 10. 63
1. 12 2. 7 3. 50 4. 30 5. 8 6. 1,415 7. 570 8. 72 9. 2,100 10. 5,600
1. 72 2. 63 3. 9 4. 8 5. 252 6. 56 7. 360 8. 3,600 9. 120 10. 900
1. 1,486 2. 8,183 3. 28 4. 70 5. 4 6. 3,428 7. 7,713 8. 12 9. 36 10. 30
1. 56 2. 63 3. 4 4. 180 5. 230 6. 3,000 7. 3,000 8. 288 9. 825 10. 2,912
1. 48 2. 96 3. 12 4. 12 5. 4 6. 6 7. 8 8. 5,400 9. 90 10. 900
1. 1,495 2. 6,780 3. 63 4. 90 5. 9 6. 1,928 7. 4,338 8. 28 9. 49 10. 84
1. 6 2. 12 3. 12 4. 6 5. 470 6. 80 7. 900 8. 134 9. 552 10. 4,554
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 1,786 2. 1,351 4 3. 12 or 13 4. 10 5. 224 6. 48 7. 560 8. 3,200 9. 50 10. 500
1. 2,875 2. 5,875 3. 33 4. 330 5. 1,100 6. 4,788 7. 6,156 8. 14 9. 21 10. 28
1. 6 2. 11 3. 70 4. 20 5. 11 6. 2,527 7. 747 8. 60 9. 2,700 10. 4,500
1. 88 2. 66 3. 11 4. 11 5. 234 6. 63 7. 490 8. 4,900 9. 40 10. 400
1. 3,347 2. 8,400 3. 54 4. 60 5. 6 6. 4,664 7. 2,332 8. 35 9. 30 10. 60
1. 28 2. 24 3. 3 4. 560 5. 190 6. 2,100 7. 4,500 8. 154 9. 1,284 10. 3,255
1. 36 2. 64 3. 7 4. 9 5. 3 6. 8 7. 7 8. 3,600 9. 30 10. 200
1. 869 2. 7,463 3. 56 4. 80 5. 8 6. 5,904 7. 7,872 8. 15 9. 6 10. 33
1. 12 2. 2 3. 12 4. 5 5. 530 6. 30 7. 400 8. 174 9. 621 10. 4,263
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
41
2,104
594
No, the total is 900.
No, 1,985 + 834 No, the total is = 2,819 5,811
374
No, both are equal to 3,094.
4,000
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
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ANSWERS Week 19: Week 19: Grasshopper Shinobi Monday Monday
Week 19: Week 20: Week 20: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 20: Week 21: Week 21: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 21: Grand Master Monday
1. 42 2. 56 3. 7 4. 7 5. 6 6. 16 7. 14 8. 361 9. 1,301 10. 2,619
1. 2,497 2. 597 3. 7 4. 8 5. 24 6. 5 7. 0.5 8. 5.5 9. 1,126 10. 4,325
1. 63 2. 60 3. 48 4. 450 5. 4 6. 1,500 7. 4,200 8. 315 9. 936 10. 4,992
1. 54 2. 138 3. 91 4. 9 5. 12 6. 15 7. 21 8. 411 9. 1,212 10. 248
1. 2,495 2. 2,394 3. 11 4. 5 5. 35 6. 6 7. 0.6 8. 6.6 9. 1,185 10. 2,415
1. 12 2. 12 3. 12 4. 2 5. 16 6. 60 7. 2,100 8. 5 9. 4 10. 7
1. 42 2. 238 3. 69 or 23 4. 4 5. 12 6. 20 7. 24 8. 1 9. 1,248 10. 1,212
1. 5,877 2. 4,184 3. 7 4. 70 5. 80 6. 240 7. 0.5 8. 0.05 9. 0.55 10. 2,848
1. 9,068 2. 5,000 3. 0.8 4. 0.4 5. 150 6. 30 7. 420 8. 79 9. 15 10. 4,905
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 56 2. 64 3. 6 4. 9 5. 8 6. 4 7. 6 8. 557 9. 1,737 10. 2,946
1. 879 2. 2,879 3. 8 4. 4 5. 12 6. 4 7. 0.4 8. 4.4 9. 1,758 10. 2,252
1. 35 2. 108 3. 72 4. 490 5. 9 6. 1,800 7. 2,400 8. 128 9. 952 10. 5,848
1. 48 2. 224 3. 120 4. 7 5. 9 6. 12 7. 12 8. 784 9. 1,121 10. 1,152
1. 3,294 2. 2,694 3. 12 4. 3 5. 21 6. 1 7. 0.1 8. 1.1 9. 3,311 10. 1,180
1. 9 2. 4 3. 7 4. 2 5. 25 6. 30 7. 3,000 8. 6 9. 5 10. 8
1. 49 2. 207 3. 89 4. 4 5. 24 6. 40 7. 30 8. 7 9. 1,158 10. 1,462
1. 3,463 2. 5,895 3. 8 4. 80 5. 30 6. 150 7. 0.4 8. 0.04 9. 0.44 10. 3,801
1. 5,923 2. 2,131 3. 0.8 4. 0.5 5. 170 6. 50 7. 720 8. 49 9. 27 10. 4,242
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 72 2. 63 3. 9 4. 12 5. 12 6. 14 7. 18 8. 847 9. 1,751 10. 3,166
1. 2,385 2. 2,954 3. 6 4. 8 5. 40 6. 8 7. 0.8 8. 8.8 9. 2,425 10. 1,812
1. 42 2. 64 3. 54 4. 810 5. 2 6. 2,100 7. 3,000 8. 224 9. 1,062 10. 3,378
1. 72 2. 216 3. 119 4. 6 5. 30 6. 30 7. 30 8. 531 9. 1,315 10. 1,454
1. 3,538 2. 2,438 3. 5 4. 9 5. 27 6. 9 7. 0.9 8. 9.9 9. 4,887 10. 3,496
1. 10 2. 3 3. 7 4. 4 5. 65 6. 50 7. 2,800 8. 4 9. 7 10. 9
1. 63 2. 216 3. 39 or 13 4. 7 5. 36 6. 45 7. 48 8. 4 9. 1,200 10. 2,417
1. 8,189 2. 6,794 3. 9 4. 90 5. 40 6. 200 7. 0.8 8. 0.08 9. 0.88 10. 2,130
1. 8,799 2. 3,346 3. 0.9 4. 0.1 5. 90 6. 120 7. 960 6 8. 12 or 12 9. 18 10. 2,826
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 48 2. 54 3. 12 4. 9 5. 18 6. 6 7. 20 8. 960 9. 2,235 10. 3,475
1. 785 2. 2,282 3. 9 4. 4 5. 20 6. 2 7. 0.2 8. 2.2 9. 2,332 10. 3,770
1. 35 2. 72 3. 36 4. 630 5. 4 6. 5,400 7. 6,300 8. 216 9. 1,512 10. 5,376
1. 56 2. 288 3. 161 4. 9 5. 18 6. 18 7. 9 8. 104 9. 1,102 10. 1,161
1. 3,483 2. 1,283 3. 12 4. 9 5. 63 6. 3 7. 0.3 8. 3.3 9. 2,070 10. 5,271
1. 11 2. 4 3. 5 4. 8 5. 71 6. 60 7. 3,600 8. 6 9. 4 10. 8
1. 72 2. 301 3. 79 4. 4 5. 8 6. 15 7. 18 8. 9 9. 1,337 10. 2,069
1. 6,066 2. 5,683 3. 5 4. 50 5. 90 6. 270 7. 0.2 8. 0.02 9. 0.22 10. 5,224
1. 8,998 2. 4,188 3. 0.9 4. 0.8 5. 10 6. 170 7. 360 3 8. 12 or 14 9. 54 10. 4,160
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 42 2. 63 3. 9 4. 8 5. 8 6. 10 7. 14 8. 1,335 9. 2,276 10. 3,269
1. 1,232 2. 1,432 3. 8 4. 4 5. 20 6. 7 7. 0.7 8. 7.7 9. 3,470 10. 6,818
1. 132 2. 144 3. 108 4. 1,800 5. 6 6. 1,200 7. 2,100 8. 310 9. 2,092 10. 4,998
1. 54 2. 168 3. 252 4. 7 5. 21 6. 12 7. 15 8. 181 9. 1,422 10. 1,333
1. 5,392 2. 2,643 3. 8 4. 12 5. 84 6. 5 7. 0.5 8. 5.5 9. 1,404 10. 1,978
1. 6 2. 6 3. 12 4. 8 5. 59 6. 90 7. 3,500 8. 3 9. 5 10. 9
1. 40 2. 243 3. 89 4. 5 5. 16 6. 25 7. 36 8. 2 9. 1,164 10. 2,133
1. 7,727 2. 3,034 3. 7 4. 70 5. 60 6. 180 7. 0.7 8. 0.07 9. 0.77 10. 2,778
1. 9,339 2. 5,361 3. 0.8 4. 0.2 5. 150 6. 190 7. 200 9 8. 12 or 34 9. 12 10. 2,736
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
388
8
Yes, 317 x 5 = 1,585.
Yes.
Iko has more. Iko has 537; Sam has 536.
7,617
No, 90 more than 646 is 736.
Yes, 18 of 64 is 8, No, 550 – 90 = and 3 x 8 is 24. 460.
130
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ANSWERS Week 22: Week 22: Grasshopper Shinobi Monday Monday
Week 22: Week 23: Week 23: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 23: Week 24: Week 24: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 24: Grand Master Monday
1. 40 2. 243 3. 29 4. 6 5. 20 6. 30 7. 0.9 8. 2 9. 3,164 10. 2,351
1. 4,439 2. 2,797 3. 6 4. 60 5. 80 6. 400 7. 0.6 8. 0.06 9. 0.66 10. 1,629
1. 3,719 2. 5,483 3. 2.8 4. 1.2 5. 2.3 6. 340 7. 400 7 8. 12 9. 16 10. 595
1. 280 2. 312 6 3. 24 or 14 4. 60 5. 18 6. 25 7. 0.5 8. 2,400 9. 5,758 10. 2,073
1. 3,495 2. 7,278 3. 8 4. 50 5. 80 6. 240 7. 0.5 8. 0.38 9. 0.07 10. 2,025
1. 3,089 2. 5,081 3. 2.1 4. 2.1 5. 60 6. 89 7. 600 5 8. 16 9. 15 10. 3,654
1. 360 2. 243 3 3. 17 4. 70 5. 21 6. 60 7. 4 8. 8,100 9. 1,001 10. 901
1. 4,593 2. 8,287 3. 9 4. 70 5. 90 6. 270 7. 5.6 8. 0.03 9. 0.7 10. 7,101
1. 11,970 2. 5,099 3. 2.3 4. 4.5 5. 30 6. 6.9 7. 300 8. 56 9. 23 10. 7.6
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 96 2. 315 3. 16 4. 12 5. 25 6. 24 7. 0.7 8. 3 9. 3,246 10. 2,632
1. 1,245 2. 6,239 3. 9 4. 90 5. 80 6. 400 7. 0.1 8. 0.01 9. 0.11 10. 4,256
1. 7,394 2. 3,495 3. 2.7 4. 0.1 5. 3.2 6. 96 7. 500 8. 11 12 9. 60 10. 603
1. 400 2. 441 5 3. 24 4. 90 5. 24 6. 14 7. 0.1 8. 4,200 9. 6,106 10. 3,191
1. 2,594 2. 6,343 3. 7 4. 60 5. 70 6. 350 7. 0.8 8. 0.57 9. 7.9 10. 5,472
1. 3,495 2. 4,838 3. 3.4 4. 4.5 5. 70 6. 48 7. 900 8. 15 16 9. 20 10. 5,712
1. 480 2. 276 8 3. 17 4. 60 5. 6 6. 15 7. 5 8. 1,800 9. 1,010 10. 1,001
1. 5,493 2. 8,378 3. 8 4. 70 5. 80 6. 240 7. 5.2 8. 0.03 9. 0.79 10. 1,725
1. 12,436 2. 1,201 3. 2.9 4. 4.7 5. 30 6. 7.4 7. 600 8. 63 9. 32 10. 9.4
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 72 2. 301 3. 26 or 13 4. 9 5. 45 6. 54 7. 0.5 8. 9 9. 4,097 10. 3,021
1. 6,394 2. 5,688 3. 11 4. 110 5. 120 6. 720 7. 0.9 8. 0.09 9. 0.99 10. 2,768
1. 8,037 2. 5,096 3. 3.9 4. 0.4 5. 4.7 6. 140 7. 700 5 8. 12 9. 35 10. 632
1. 560 2. 333 9 3. 24 or 38 4. 50 5. 42 6. 24 7. 0.9 8. 5,400 9. 6,446 10. 3,191
1. 2,483 2. 8,268 3. 4 4. 80 5. 40 6. 120 7. 0.09 8. 0.7 9. 9.3 10. 4,524
1. 2,938 2. 5,382 3. 4.5 4. 6.2 5. 50 6. 96 7. 500 8. 13 16 9. 42 10. 8,451
1. 420 2. 234 3. 15 17 4. 50 5. 21 6. 32 7. 7 8. 4,200 9. 1,091 10. 911
1. 4,394 2. 6,283 3. 8 4. 30 5. 80 6. 160 7. 9 8. 0.08 9. 0.76 10. 1,629
1. 13,881 2. 4,649 3. 3.5 4. 5.7 5. 70 6. 8.3 7. 400 8. 48 9. 23 10. 8.3
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 64 2. 312 2 3. 12 or 16 4. 3 5. 42 6. 21 7. 0.6 8. 7 9. 4,243 10. 2,254
1. 4,593 2. 7,398 3. 7 4. 70 5. 90 6. 450 7. 0.3 8. 0.03 9. 0.33 10. 3,576
1. 7,493 2. 4,953 3. 4.6 4. 1.3 5. 5.6 6. 170 7. 800 5 8. 10 12 or 6 9. 28 10. 765
1. 720 2. 414 4 3. 24 or 16 4. 80 5. 56 6. 40 7. 0.8 8. 6,400 9. 7,276 10. 3,065
1. 4,493 2. 7,375 3. 9 4. 40 5. 90 6. 270 7. 7.5 8. 0.09 9. 8 10. 7,506
1. 4,581 2. 6,931 3. 5.8 4. 7.2 5. 80 6. 76 7. 700 8. 18 19 9. 30 10. 2,575
1. 540 2. 378 3. 14 17 4. 70 5. 32 6. 18 7. 9 8. 7,200 9. 1,011 10. 1,010
1. 4,382 2. 6,426 3. 6 4. 30 5. 60 6. 120 7. 5.3 8. 0.03 9. 0.75 10. 4,722
1. 13,253 2. 3,978 3. 3.7 4. 5.9 5. 70 6. 1.6 7. 400 8. 45 9. 32 10. 6.3
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 81 2. 378 1 3. 12 4. 6 5. 12 6. 14 7. 0.9 8. 1 9. 6,195 10. 1,139
1. 7,594 2. 8,498 3. 5 4. 50 5. 70 6. 280 7. 0.7 8. 0.07 9. 0.77 10. 1,722
1. 6,492 2. 3,048 3. 5.1 4. 0.9 5. 7.5 6. 350 7. 800 2 8. 12 or 16 9. 24 10. 483
1. 560 2. 432 1 3. 24 4. 80 5. 14 6. 10 7. 0.3 8. 8,100 9. 9,736 10. 2,951
1. 3,594 2. 6,289 3. 9 4. 80 5. 90 6. 270 7. 9.3 8. 0.04 9. 0.79 10. 5,190
1. 1,209 2. 7,940 3. 6.5 4. 8.5 5. 120 6. 89 7. 200 8. 15 19 9. 16 10. 3,512
1. 420 2. 576 5 3. 17 4. 40 5. 22 6. 56 7. 1 8. 5,400 9. 1,010 10. 901
1. 5,393 2. 6,477 3. 2 4. 90 5. 20 6. 100 7. 0.62 8. 0.3 9. 3.4 10. 2,760
1. 11,947 2. 4,088 3. 6.9 4. 4.5 5. 50 6. 7.3 7. 500 8. 64 9. 36 10. 7.5
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Tom has more. Tom has 339; Sam has 329.
Yes, 720 divided by 8 is 90.
12
Iko has 600.
6,133
504
No, Tom is Yes, both are incorrect. Both equal to 400. answers are 50.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
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ANSWERS Week 25: Week 25: Grasshopper Shinobi Monday Monday
Week 25: Week 26: Week 26: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 26: Week 27: Week 27: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 27: Grand Master Monday
1. 240 2. 138 9 3. 11 4. 5,491 5. 4 6. 35 7. 4.2 8. 540 9. 1,346 10. 2,554
1. 5,493 2. 8,346 3. 6 4. 20 5. 200 6. 600 7. 5.9 8. 0.09 9. 0.75 10. 2,229
1. 4,384 2. 7,805 3. 10.5 4. 8.9 5. 5 6. 210 7. 2,100 8. 64 9. 0.06 10. 0.75
1. 36 2. 156 3 3. 15 or 15 4. 9,362 5. 8 6. 27 7. 3 8. 21 9. 10 10. 900
1. 0.8 2. 3.8 3. 4.1 4. 8 5. 80 6. 800 7. 46 8. 47 9. 75 or 1 25 10. 85 or 1 35
1. 400 2. 12,374 3. 6.3 4. 6.5 5. 8 6. 1,400 7. 5,400 8. 141 9. 1.6 10. 0.05
1. 540 2. 144 7 3. 13 4. 5,637 5. 70 6. 24 7. 7.3 8. 41 9. 3,000 10. 50
1. 0.5 2. 3.5 3. 4.3 4. 4 5. 40 6. 400 7. 14 8. 24 1 9. 14 12 or 1 6 12 10. 10 or 1 15
1. 8,704 2. 6,405 3. 5.42 4. 11.45 5. 343 6. 715 7. 500 8. 34 9. 26 10. 32
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 450 2. 364 2 3. 11 4. 401 5. 9 6. 50 7. 1.7 8. 810 9. 1,497 10. 2,121
1. 4,593 2. 8,378 3. 2 4. 80 5. 800 6. 200 7. 0.52 8. 0.7 9. 3.7 10. 1,410
1. 4,597 2. 10,694 3. 13.9 4. 9.2 5. 9 6. 790 7. 4,200 8. 78 9. 0.09 10. 0.16
1. 48 2. 270 6 3. 15 or 25 4. 1,364 5. 9 6. 20 7. 4 8. 11 9. 60 10. 400
1. 0.9 2. 2.9 3. 3.3 4. 7 5. 70 6. 700 7. 23 8. 24 1 9. 13 12 or 1 12 5 10. 17 or 1 12 12
1. 600 2. 14,083 3. 5.9 4. 7.5 5. 3 6. 3,400 7. 4,500 8. 205 9. 2.7 10. 0.09
1. 240 2. 184 3. 11 14 4. 1,205 5. 40 6. 12 7. 8.3 8. 43 9. 2,000 10. 20
1. 0.9 2. 7.9 3. 8.2 4. 8 5. 80 6. 800 7. 21 8. 19 2 9. 21 15 or 1 5 7 10. 22 or 1 15 15
1. 9,730 2. 9,645 3. 2.34 4. 4.56 5. 456 6. 1,816 7. 800 8. 39 9. 42 10. 37
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 540 2. 243 4 3. 11 4. 4,374 5. 5 6. 20 7. 2.3 8. 360 9. 1,914 10. 2,367
1. 4,593 2. 7,287 3. 4 4. 70 5. 700 6. 400 7. 0.04 8. 0.9 9. 4.5 10. 1,701
1. 6,164 2. 9,176 3. 16.4 4. 9.1 5. 8 6. 910 7. 3,000 8. 85 9. 0.16 10. 0.06
1. 36 2. 288 7 3. 13 4. 2,374 5. 4 6. 45 7. 5 8. 12 9. 0 10. 900
1. 0.9 2. 10.9 3. 11.1 4. 8 5. 80 6. 800 7. 19 8. 17 1 9. 18 15 or 1 5 2 10. 17 or 1 15 15
1. 900 2. 9,204 3. 6.7 4. 9.5 5. 5 6. 5,200 7. 8,100 8. 317 9. 4.2 10. 0.12
1. 360 2. 387 4 3. 14 or 27 4. 934 5. 50 6. 21 7. 3.2 8. 71 9. 1,000 10. 70
1. 0.6 2. 8.6 3. 9.2 4. 7 5. 70 6. 700 7. 23 8. 17 1 9. 12 8 or 1 2 4 10. 13 or 1 9 9
1. 7,728 2. 9,457 3. 5.61 4. 3.17 5. 595 6. 3,642 7. 800 8. 43 9. 45 10. 39
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 630 2. 342 5 3. 15 or 13 4. 5,172 5. 8 6. 18 7. 3.2 8. 420 9. 1,359 10. 2,484
1. 4,503 2. 6,362 3. 6 4. 80 5. 800 6. 600 7. 0.04 8. 0.93 9. 0.6 10. 1,675
1. 5,825 2. 9,602 3. 14.8 4. 9.6 5. 4 6. 460 7. 4,500 8. 126 9. 0.65 10. 0.17
1. 81 2. 392 3. 12 13 4. 3,983 5. 6 6. 15 7. 7 8. 35 9. 10 10. 400
1. 0.8 2. 3.8 3. 4.2 4. 7 5. 70 6. 700 7. 14 8. 16 7 9. 27 20 or 1 20 7 10. 27 or 1 20 20
1. 700 2. 11,811 3. 9.8 4. 10.5 5. 7 6. 5,600 7. 4,200 8. 299 9. 9.4 10. 0.05
1. 280 2. 441 9 3. 10 4. 2,003 5. 90 6. 48 7. 1.1 8. 12 9. 6,000 10. 80
1. 0.9 2. 4.9 3. 5.5 4. 2 5. 20 6. 200 7. 26 8. 14 1 9. 16 15 or 1 15 2 10. 28 or 1 20 5
1. 8,069 2. 9,870 3. 7.12 4. 6.86 5. 516 6. 5,384 7. 600 8. 54 9. 52 10. 44
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 360 2. 258 3 3. 15 or 15 4. 7,374 5. 7 6. 9 7. 4.6 8. 630 9. 1,512 10. 2,992
1. 3,595 2. 7,204 3. 9 4. 60 5. 600 6. 900 7. 0.6 8. 0.93 9. 0.07 10. 3,661
1. 6,381 2. 8,485 3. 14.3 4. 9.1 5. 11 6. 890 7. 6,300 8. 141 9. 0.76 10. 0.05
1. 54 2. 558 3. 12 13 4. 6,371 5. 7 6. 28 7. 1 8. 21 9. 30 10. 600
1. 0.7 2. 12.7 3. 13.3 4. 6 5. 60 6. 600 7. 29 8. 31 1 9. 24 18 or 1 3 7 10. 25 18 or 1 18
1. 800 2. 13,062 3. 7.8 4. 12.6 5. 7 6. 7,900 7. 5,400 8. 302 9. 7.4 10. 0.45
1. 320 2. 364 2 3. 10 or 15 4. 3,476 5. 100 6. 28 7. 1.8 8. 19 9. 7,000 10. 40
1. 0.8 2. 2.8 3. 3.5 4. 8 5. 80 6. 800 7. 24 8. 15 2 9. 27 25 or 1 25 1 10. 18 12 or 1 2
1. 9,171 2. 9,981 3. 6.71 4. 6.13 5. 665 6. 4,296 7. 600 8. 57 9. 49 10. 62
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
No, 9,283 – 8,384 = 899.
1,104
24
4,908
902
Yes, 2.7 – 1.4 = 1.3
324
Yes, 28 is No, 9,362 – greater than 27. 2,005 = 7,357.
132
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Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:52
ANSWERS Week 28: Week 28: Grasshopper Shinobi Monday Monday
Week 28: Week 29: Week 29: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 29: Week 30: Week 30: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 30: Grand Master Monday
1. 81 2. 133 3 3. 12 16 or 4 4. 3,586 5. 9 6. 36 7. 2.3 8. 42 9. 7 10. 100
1. 0.5 2. 3.5 3. 2.9 4. 4 5. 40 6. 400 7. 15 8. 21 9. 95 or 1 45 1 10. 12 9 or 1 3
1. 5,384 2. 3,153 3. 6.7 4. 6.1 5. 66 6. 4,563 7. 600 8. 76 or 1 16 9. 34 10. 54
1. 30 2. 392 7 3. 16 4. 882 5. 6 6. 6 7. 1,628 8. 1,409 9. 200 10. 2,000
1. 0.3 2. 9.3 3. 8.7 4. 4 5. 40 6. 400 7. 18 8. 14 9. 97 or 1 27 10. 25
1. 8,784 2. 8,694 3. 6 4. 7 5. 54 6. 402 7. 70 2 8. 11 9 or 1 9 5 9. 14 or 1 9 9 10. 36
1. 40 2. 368 3. 396 8 4. 19 5. 400 6. 12 7. 2,709 8. 620 9. 40 10. 40
1. 5.3 2. 0.8 3. 2.5 4. 6 5. 60 6. 600 7. 13 8. 48 9. 87 or 1 17 10. 72 or 3 12
1. 5,724 2. 3,001 3. 13.55 4. 7.11 5. 35 6. 1,500 7. 6 8. 45 2 9. 16 14 or 1 14 10. 60
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 56 2. 207 9 3. 16 4. 1,236 5. 8 6. 40 7. 1.7 8. 35 9. 5 10. 400
1. 0.4 2. 6.4 3. 5.9 4. 12 5. 120 6. 1,200 7. 27 8. 19 9 9. 10 2 10. 11 9 or 1 9
1. 6,626 2. 3,164 3. 9.4 4. 9.1 5. 42 6. 552 7. 200 8. 96 or 1 36 9. 45 10. 51
1. 48 2. 558 3 3. 12 16 or 4 4. 305 5. 9 6. 12 7. 1,525 8. 987 9. 500 10. 1,000
1. 0.2 2. 12.2 3. 11.9 4. 6 5. 60 6. 600 7. 14 8. 29 8 9. 11 10. 87 or 1 17
1. 8,183 2. 7,483 3. 3 4. 5 5. 36 6. 624 7. 90 5 8. 14 9 or 1 9 2 9. 11 9 or 1 9 10. 45
1. 42 2. 468 3. 924 9 4. 19 5. 700 6. 30 7. 2,399 8. 1,668 9. 60 10. 160
1. 12.8 2. 4.5 3. 4.3 4. 12 5. 120 6. 1,200 7. 31 8. 32 3 9. 11 8 or 1 8 1 10. 19 or 2 9 9
1. 6,938 2. 5,372 3. 13.4 4. 4.91 5. 35 6. 2,400 7. 9 8. 55 1 9. 15 14 or 1 14 10. 70
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 54 2. 256 1 3. 16 4. 2,374 5. 12 6. 15 7. 1.9 8. 41 9. 1 10. 900
1. 0.1 2. 5.1 3. 4.6 4. 12 5. 120 6. 1,200 7. 32 8. 18 9. 35 10. 87 or 1 17
1. 7,905 2. 2,132 3. 4.8 4. 4.6 5. 54 6. 5,238 7. 900 3 8. 11 8 or 1 8 9. 63 10. 72
1. 45 2. 348 3. 11 19 4. 561 5. 7 6. 35 7. 1,561 8. 750 9. 200 10. 3,000
1. 0.4 2. 10.4 3. 9.7 4. 9 5. 90 6. 900 7. 16 8. 13 1 9. 28 27 or 1 27 1 10. 10 or 20 2
1. 6,284 2. 3,583 3. 9 4. 6 5. 24 6. 792 7. 90 8. 95 or 1 45 2 9. 15 9 or 1 3 10. 53
1. 63 2. 315 3. 936 6 4. 19 5. 900 6. 12 7. 2,065 8. 1,265 9. 70 10. 180
1. 7.1 2. 3.7 3. 3.4 4. 6 5. 60 6. 600 7. 30 8. 41 3 9. 22 19 or 1 19 10. 27 or 3 9
1. 7,371 2. 6,483 3. 14.48 4. 8.55 5. 49 6. 4,200 7. 6 8. 16 3 9. 12 9 or 1 9 10. 40
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 42 2. 387 3 3. 16 4. 3,215 5. 5 6. 28 7. 2.1 8. 51 9. 1 10. 500
1. 0.2 2. 8.2 3. 7.7 4. 3 5. 30 6. 300 7. 14 8. 15 9. 19 20 10. 58
1. 8,471 2. 5,843 3. 5.9 4. 7.6 5. 27 6. 4,464 7. 700 6 8. 15 9 or 1 9 9. 67 10. 75
1. 72 2. 441 3. 13 19 4. 613 5. 7 6. 16 7. 2,010 8. 833 9. 800 10. 5,000
1. 0.2 2. 15.2 3. 14.6 4. 11 5. 110 6. 1,100 7. 28 8. 16 9. 41 45 9 10. 13
1. 7,604 2. 4,292 3. 8 4. 9 5. 54 6. 5,406 7. 70 1 8. 11 5 or 2 5 19 7 9. 12 or 1 12 10. 62
1. 35 2. 261 3. 830 3 4. 19 5. 400 6. 27 7. 4,210 8. 1,965 9. 90 10. 260
1. 3.8 2. 5.6 3. 3.6 4. 7 5. 70 6. 700 7. 26 8. 17 9. 17 18 8 10. 20 12 or 1 12
1. 8,374 2. 9,092 3. 13.42 4. 9.6 5. 12 6. 5,400 7. 8 8. 56 6 9. 15 9 or 1 9 10. 30
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 30 2. 392 1 3. 16 4. 902 5. 7 6. 40 7. 0.8 8. 7 9. 4 10. 400
1. 0.1 2. 9.1 3. 8.8 4. 4 5. 40 6. 400 7. 17 8. 13 2 9. 11 9 or 1 9 10. 98 or 1 18
1. 8,172 2. 6,847 3. 6.2 4. 9.3 5. 36 6. 801 7. 700 2 8. 11 9 or 1 9 9. 73 10. 84
1. 56 2. 576 3. 16 19 4. 506 5. 4 6. 12 7. 2,509 8. 380 9. 300 10. 9,000
1. 0.2 2. 6.2 3. 5.7 4. 5 5. 50 6. 500 7. 13 8. 19 9. 73 or 2 13 10. 14 7 or 2
1. 6,524 2. 9,234 3. 6 4. 2 5. 81 6. 2,247 7. 30 2 8. 12 5 or 2 5 1 9. 21 or 1 18 6 10. 68
1. 56 2. 252 3. 729 1 4. 19 5. 1,100 6. 30 7. 4,355 8. 2,731 9. 110 10. 280
1. 4.8 2. 2.5 3. 5.5 4. 6 5. 60 6. 600 7. 33 8. 25 8 9. 28 20 or 1 20 2 10. 26 8 or 3 8
1. 9,005 2. 8,314 3. 14.43 4. 8.3 5. 27 6. 4,800 7. 7 8. 56 2 9. 11 9 or 1 9 10. 90
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
No, both are equal to 36.
No, there are only 3 hundreds.
400
904
No, one quarter of 240 is 60; 30 x 3 = 90.
No, 9,502 – 8,001 = 1,501
No, Tom has 1,740 4.2, Iko has 3.1, but Sam has 6.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 133
12
133
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ANSWERS Week 31: Week 31: Grasshopper Shinobi Monday Monday
Week 31: Week 32: Week 32: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 32: Week 33: Week 33: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 33: Grand Master Monday
1. 240 2. 126 3. 1,012 6 4. 12 14 or 7 5. 12 6. 18 7. 6,555 8. 3,103 9. 10 10. 5
1. 5.1 2. 15.1 3. 15.5 4. 10 5. 20 6. 200 7. 38 8. 15 2 9. 11 9 or 1 9 12 10. 8 or 1 48
1. 4,275 2. 9,051 3. 9.37 4. 1.2 5. 27 6. 26 7. 70 8. 47 9. 49 10. 210
1. 180 2. 408 3. 1,092 7 4. 10 5. 12 6. 42 7. 3,013 8. 1,182 9. 10 10. 10
1. 8.5 2. 18.5 3. 11.7 4. 6 5. 60 6. 600 7. 24 8. 39 3 9. 23 20 or 1 20 10 1 10. 9 or 1 9
1. 42 2. 40 3. 5,200 4. 30 5. 69 6. 53 7. 3.6 8. 30 5 9. 10 14 or 7 10 10. 10 or 1
1. 320 2. 414 3. 1,845 4. 60 5. 6.3 6. 84 7. 4,516 8. 3,516 9. 1.2 10. 0.9
1. 0.94 2. 1.04 3. 3.14 4. 210 5. 2,100 6. 235 7. 268 8. 185 9. 0.4 10. 0.04
1. 7 2. 8 3. 3.5 4. 10 5. 39 6. 47 7. 0.45 8. 30 9. 45 4 10. 10 6 or 1 6
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 270 2. 208 3. 738 5 4. 10 14 or 7 5. 6 6. 18 7. 6,504 8. 4,116 9. 4 10. 7
1. 5.9 2. 15.9 3. 13.6 4. 3 5. 6 6. 60 7. 44 8. 22 4 9. 15 11 or 1 11 1 10. 11 or 2 5 5
1. 4,405 2. 8,304 3. 11.93 4. 4.9 5. 12 6. 37 7. 50 8. 67 9. 89 10. 540
1. 280 2. 104 3. 1,310 1 4. 10 5. 6 6. 36 7. 3,320 8. 4,111 9. 5 10. 1
1. 10.3 2. 14.3 3. 8.9 4. 7 5. 70 6. 700 7. 21 8. 19 9. 75 or 1 25 6 10. 12 or 12
1. 72 2. 70 3. 7,800 4. 60 5. 72 6. 67 7. 4.7 8. 45 9. 11 14 8 10. 10 or 45
1. 420 2. 336 3. 1,080 4. 90 5. 7.2 6. 15 7. 3,050 8. 1,984 9. 1.3 10. 0.3
1. 0.64 2. 1.24 3. 4.24 4. 240 5. 2,400 6. 365 7. 254 8. 136 9. 0.3 10. 0.03
1. 9 2. 8 3. 4.1 4. 9 5. 43 6. 74 7. 0.64 8. 48 9. 75 or 1 25 10. 56
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 360 2. 414 3. 1,268 6 4. 14 or 37 5. 7 6. 14 7. 7,429 8. 4,082 9. 9 10. 6
1. 9.9 2. 29.9 3. 23.3 4. 4 5. 8 6. 80 7. 16 8. 13 3 9. 11 4 or 2 4 4 10. 12 or 1 8 8
1. 3,605 2. 6,734 3. 12.68 4. 5.1 5. 24 6. 36 7. 70 8. 67 9. 49 10. 480
1. 180 2. 270 3. 1,260 6 4. 10 or 35 5. 5 6. 16 7. 2,558 8. 4,049 9. 25 10. 20
1. 10.3 2. 14.3 3. 8.7 4. 4 5. 40 6. 400 7. 19 8. 13 3 9. 14 11 or 1 11 3 10. 12 or 1 9 9
1. 84 2. 90 3. 9,800 4. 80 5. 57 6. 29 7. 1.1 8. 72 8 9. 14 or 47 9 10. 12 or 34
1. 360 2. 232 3. 1,236 4. 80 5. 8.6 6. 41 7. 7,006 8. 1,095 9. 3.2 10. 0.5
1. 0.98 2. 1.28 3. 6.28 4. 150 5. 1,500 6. 172 7. 264 8. 168 9. 0.2 10. 0.02
1. 7 2. 8 3. 4.4 4. 7 5. 55 6. 44 7. 0.74 8. 60 9. 65 or 1 15 1 10. 10 9 or 1 9
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 420 2. 336 3. 975 4 4. 10 or 25 5. 8 6. 32 7. 8,546 8. 3,452 9. 6 10. 3
1. 5.1 2. 25.1 3. 18.7 4. 4 5. 8 6. 80 7. 16 8. 49 9. 95 or 1 45 1 10. 13 12 or 1 12
1. 10,606 2. 4,504 3. 12.1 4. 5.9 5. 20 6. 56 7. 90 8. 87 or 1 17 5 9. 10 or 12 10. 120
1. 350 2. 434 3. 1,518 1 4. 12 5. 5 6. 12 7. 3,739 8. 1,283 9. 20 10. 5
1. 11.7 2. 17.7 3. 6.9 4. 3 5. 30 6. 300 7. 23 8. 48 1 9. 26 25 or 1 25 7 10. 11
1. 90 2. 70 3. 1,200 4. 50 5. 96 6. 36 7. 9.3 8. 24 5 9. 10 14 or 7 9 10. 12 or 34
1. 300 2. 392 3. 2,712 4. 60 5. 7.4 6. 63 7. 4,905 8. 2,326 9. 5.9 10. 1.5
1. 0.89 2. 1.19 3. 6.19 4. 240 5. 2,400 6. 475 7. 253 8. 175 9. 0.5 10. 0.05
1. 9 2. 8 3. 4.5 4. 7 5. 48 6. 76 7. 0.78 8. 63 9. 85 or 1 35 6 10. 15 9 or 1 9
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 540 2. 336 3. 549 3 4. 10 5. 5 6. 15 7. 8,541 8. 3,193 9. 5 10. 20
1. 8.4 2. 18.4 3. 5.5 4. 2 5. 4 6. 40 7. 33 8. 29 7 9. 27 20 or 1 20 5 10. 15 10 or 1 10
1. 11,602 2. 3,534 3. 17.2 4. 2.6 5. 25 6. 58 7. 50 8. 89 8 9. 10 10. 400
1. 490 2. 444 3. 1,683 5 4. 14 5. 7 6. 21 7. 4,978 8. 3,910 9. 10 10. 3
1. 11.2 2. 17.2 3. 6.4 4. 7 5. 70 6. 700 7. 18 8. 15 3 9. 18 15 or 1 15 3 10. 15 12 or 1 12
1. 60 2. 80 3. 4,600 4. 20 5. 98 6. 68 7. 8.5 8. 27 1 9. 15 14 or 1 14 5 10. 10 12 or 6
1. 810 2. 432 3. 2,863 4. 60 5. 9.9 6. 27 7. 3,374 8. 3,953 9. 5.9 10. 2.3
1. 0.92 2. 1.12 3. 10.12 4. 120 5. 1,200 6. 368 7. 298 8. 196 9. 0.6 10. 0.06
1. 7 2. 12 3. 8.1 4. 8 5. 41 6. 56 7. 0.92 8. 27 9. 87 or 1 17 6 10. 15 9 or 1 9
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
No, 600 less than 2,034 is 1,434.
Yes, both are equal to 800.
14
9,600
Yes, 6 x 7 = 42.
Yes, 0.5 + 0.7 = 1.2, 0.04 + 0.04 = 0.08. 1.2 + 0.08 = 1.28.
Yes, 17 of 63 is 9, 40 and 9 x 3 is 27.
134
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 134
No, 17 of 56 is 8, and 8 x 6 is 48.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:52
ANSWERS Week 34: Week 34: Grasshopper Shinobi Monday Monday
Week 34: Week 35: Week 35: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 35: Week 36: Week 36: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 36: Grand Master Monday
1. 270 2. 342 3. 32 4. 30 5. 0.8 6. 6 7. 24 8. 8 9. 6.2 10. 0.7
1. 0.92 2. 1.02 3. 6.02 4. 240 5. 2,400 6. 462 7. 247 8. 39 9. 0.1 10. 0.01
1. 42 2. 12 3. 7.4 4. 0.09 5. 4.15 6. 0.75 7. 0.6 8. 30 9. 0.07 10. 0.1
1. 420 2. 520 3. 45 4. 80 5. 1.6 6. 140 7. 54 8. 8 9. 7.3 10. 4.7
1. 0.33 2. 0.63 3. 10.93 4. 160 5. 1,600 6. 248 7. 125 8. 123 9. 4.5 10. 0.45
1. 5 2. 500 3. 76 4. 2 5. 732 6. 47 7. 24 8. 7 9. 12 10. 8
1. 3,600 2. 992 3. 26 4. 30 5. 9.5 6. 450 7. 49 8. 7 9. 5.6 10. 5.9
1. 0.48 2. 0.98 3. 2.68 4. 180 5. 1,800 6. 86 7. 78 8. 47 9. 7.7 10. 0.77
1. 500 2. 90 3. 930 4. 25 5. 546 6. 3.7 7. 7 8. 70 9. 0.7 10. 80
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 400 2. 234 3. 34 4. 70 5. 0.9 6. 2 7. 54 8. 8 9. 6.3 10. 1.6
1. 0.84 2. 1.14 3. 23.3 4. 90 5. 900 6. 228 7. 268 8. 125 9. 0.7 10. 0.07
1. 56 2. 12 3. 1.5 4. 0.14 5. 6.05 6. 0.49 7. 0.8 8. 30 9. 0.01 10. 1.4
1. 490 2. 408 3. 38 4. 60 5. 2.5 6. 280 7. 72 8. 6 9. 5.7 10. 3.6
1. 0.46 2. 0.76 3. 2.86 4. 160 5. 1,600 6. 235 7. 145 8. 115 9. 5.6 10. 0.56
1. 6 2. 600 3. 82 4. 5 5. 192 6. 64 7. 26 8. 9 9. 17 10. 8
1. 4,500 2. 688 3. 17 4. 100 5. 4.6 6. 190 7. 36 8. 7 9. 10.3 10. 8.7
1. 0.57 2. 0.37 3. 1.77 4. 560 5. 5,600 6. 146 7. 82 8. 63 9. 8.6 10. 0.86
1. 400 2. 60 3. 630 4. 36 5. 201 6. 6.1 7. 4 8. 60 9. 0.8 10. 40
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 480 2. 415 3. 23 4. 90 5. 0.6 6. 1 7. 56 8. 9 9. 7.1 10. 2.5
1. 0.84 2. 1.14 3. 8.14 4. 560 5. 5,600 6. 428 7. 247 8. 170 9. 0.9 10. 0.09
1. 63 2. 7 3. 1.5 4. 0.5 5. 7.15 6. 0.57 7. 15 8. 50 9. 0.05 10. 0.9
1. 540 2. 344 3. 56 4. 40 5. 2.9 6. 110 7. 45 8. 9 9. 5.6 10. 1.8
1. 0.38 2. 0.98 3. 1.88 4. 720 5. 7,200 6. 75 7. 98 8. 113 9. 7.6 10. 0.76
1. 6 2. 900 3. 45 4. 9 5. 372 6. 73 7. 45 8. 4 9. 52 10. 6
1. 2,100 2. 1,270 3. 19 4. 80 5. 5.7 6. 250 7. 64 8. 6 9. 11.3 10. 7.1
1. 0.49 2. 0.69 3. 4.49 4. 600 5. 6,000 6. 78 7. 55 8. 19 9. 7.8 10. 0.78
1. 900 2. 40 3. 470 4. 18 5. 163 6. 7.4 7. 9 8. 90 9. 0.2 10. 10
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 350 2. 552 3. 24 4. 70 5. 0.9 6. 4 7. 54 8. 7 9. 11.1 10. 2.7
1. 0.97 2. 1.27 3. 8.27 4. 480 5. 4,800 6. 284 7. 271 8. 53 9. 0.8 10. 0.08
1. 35 2. 7 3. 1.9 4. 0.2 5. 8.56 6. 0.23 7. 14 8. 50 9. 0.04 10. 0.4
1. 630 2. 592 3. 32 4. 110 5. 3.2 6. 190 7. 56 8. 9 9. 9.5 10. 5.4
1. 0.74 2. 0.94 3. 2.84 4. 140 5. 1,400 6. 238 7. 124 8. 117 9. 8.7 10. 0.87
1. 6 2. 700 3. 61 4. 5 5. 418 6. 19 7. 107 8. 6 9. 61 10. 7
1. 2,800 2. 1,086 3. 23 4. 40 5. 8.7 6. 890 7. 81 8. 8 9. 15 10. 6.8
1. 0.25 2. 0.25 3. 2.95 4. 630 5. 6,300 6. 36 7. 58 8. 73 9. 1.8 10. 0.18
1. 1,200 2. 90 3. 490 4. 38 5. 305 6. 6.1 7. 6 8. 70 9. 0.7 10. 50
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 560 2. 595 3. 34 4. 80 5. 0.7 6. 1 7. 45 8. 3 9. 11.3 10. 0.5
1. 0.22 2. 1.06 3. 11.06 4. 27 5. 2,700 6. 356 7. 298 8. 147 9. 0.2 10. 0.02
1. 63 2. 7 3. 5.6 4. 0.8 5. 2.16 6. 0.43 7. 36 8. 50 9. 0.09 10. 1.2
1. 540 2. 672 3. 18 4. 80 5. 4.5 6. 320 7. 72 8. 8 9. 6.4 10. 8.4
1. 0.53 2. 0.73 3. 2.93 4. 350 5. 3,500 6. 165 7. 98 8. 56 9. 1.3 10. 0.13
1. 10 2. 900 3. 93 4. 2 5. 546 6. 37 7. 114 8. 7 9. 71 10. 9
1. 4,900 2. 2,115 3. 15 4. 80 5. 4.2 6. 730 7. 16 8. 9 9. 13.3 10. 4.5
1. 0.18 2. 0.58 3. 3.72 4. 420 5. 4,200 6. 96 7. 103 8. 62 9. 5.9 10. 0.59
1. 1,100 2. 60 3. 690 4. 45 5. 415 6. 9.6 7. 2 8. 80 9. 0.6 10. 9
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Yes, both are equal to 100.
Yes, her answer is 4.61, which is greater than 4.5.
No, the difference is 200. 2 x 200 = 400 and 2 x 300 = 600.
Yes, 2,000 – 1,374 = 626.
249
No, 10,383 + No, 46 x 6 = 8,265 = 18,648. 276
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 135
No, 360 divided by 100 is 3.6.
No, 15 of 35 is 7, and 7 x 3 is 21.
135
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ANSWERS Week 37: Week 37: Grasshopper Shinobi Monday Monday
Week 37: Week 38: Week 38: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 38: Week 39: Week 39: Grand Master Grasshopper Shinobi Monday Monday Monday
Week 39: Grand Master Monday
1. 3,500 2. 1,804 3. 17 4. 30 5. 54 or 1 14 6. 75 or 1 25 7. 42 8. 8 9. 11.1 10. 3.2
1. 3.53 2. 2.05 3. 0.85 4. 180 5. 1,800 6. 426 7. 65 8. 123 9. 0.1 10. 0.78
1. 11.84 2. 8.47 3. 13,066 4. 2,205 5. 415 6. 97 7. 2.6 8. 408 9. 27 10. 75 or 1 25
1. 360 2. 1,496 3. 21 4. 500 7 5. 16 9 or 1 9 13 3 6. 10 or 1 10 7. 7,837 8. 2,091 9. 37.2 10. 7.6
1. 4.74 2. 2.97 3. 1.87 4. 360 5. 3,600 6. 159 7. 59 8. 76 9. 5.6 10. 0.09
1. 1.8 2. 8.5 3. 12,406 4. 8,485 5. 4,410 6. 490 7. 1.7 8. 424 9. 12 10. 39 or 13
1. 4,200 2. 2,466 3. 63 4. 800 5. 98 or 118 1 6. 15 14 or 1 14 7. 270 8. 40 9. 93 10. 450
1. 7.32 2. 3.68 3. 6.84 4. 270 5. 2,700 6. 107 7. 438 8. 156 9. 3.4 10. 0.34
1. 31.78 2. 12.63 3. 420 4. 6 5. 915 6. 630 7. 6.7 8. 315 9. 21 10. 11 19
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
1. 3,600 2. 1,578 3. 21 4. 40 5. 86 or 1 26 6. 85 or 1 35 7. 72 8. 12 9. 12.1 10. 2.8
1. 5.94 2. 4.38 3. 3.66 4. 200 5. 2,000 6. 265 7. 97 8. 69 9. 8.6 10. 0.03
1. 15.75 2. 9.46 3. 15,832 4. 3,730 5. 466 6. 56 7. 3.7 8. 441 9. 9 10. 65 or 1 15
1. 420 2. 1,104 3. 21 4. 300 1 5. 10 9 or 1 9 1 6. 11 or 1 10 10 7. 8,898 8. 5,929 9. 38.7 10. 14.8
1. 7.34 2. 5.57 3. 5.47 4. 320 5. 3,200 6. 96 7. 78 8. 216 9. 0.8 10. 0.34
1. 6.9 2. 9.6 3. 13,273 4. 9,203 5. 5,789 6. 490 7. 4.5 8. 672 9. 48 10. 49
1. 4,800 2. 2,844 3. 52 4. 900 5. 98 or 1 18 1 6. 15 14 or 1 14 7. 150 8. 90 9. 73 10. 210
1. 3.76 2. 2.67 3. 2.67 4. 180 5. 1,800 6. 231 7. 367 8. 329 9. 5.9 10. 0.59
1. 29.46 2. 9.19 3. 450 4. 7 5. 1,270 6. 710 7. 7.1 8. 522 9. 24 6 3 10. 20 or 10
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
Wednesday
1. 5,400 2. 966 3. 24 4. 50 2 5. 11 9 or 1 9 4 6. 10 or 1 6 6 7. 63 8. 12 9. 14.2 10. 2.8
1. 6.35 2. 3.77 3. 3.77 4. 240 5. 2,400 6. 38 7. 159 8. 93 9. 0.7 10. 0.97
1. 14.19 2. 11.27 3. 16,044 4. 1,780 5. 523 6. 151 7. 6.2 8. 426 9. 54 10. 86 or 1 26
1. 630 2. 736 3. 21 4. 400 5. 87 or 1 17 2 6. 12 10 or 1 10 7. 6,908 8. 5,631 9. 24.1 10. 18.6
1. 7.31 2. 4.85 3. 5.55 4. 360 5. 3,600 6. 112 7. 76 8. 136 9. 8.3 10. 0.83
1. 3.6 2. 6.7 3. 10,273 4. 9,283 5. 7,296 6. 490 7. 5.7 8. 736 9. 24 4 10. 12 or 13
1. 1,800 2. 3,660 3. 61 4. 600 1 5. 10 9 or 1 9 6 6. 15 or 1 9 9 7. 80 8. 10 9. 99 10. 450
1. 8.13 2. 4.45 3. 3.65 4. 240 5. 2,400 6. 82 7. 408 8. 45 9. 6.7 10. 0.67
1. 29.51 2. 7.92 3. 480 4. 7 5. 2,816 6. 850 7. 8.4 8. 513 9. 27 6 3 10. 20 or 10
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
Thursday
1. 1,800 2. 1,810 3. 45 4. 80 7 5. 16 9 or 1 9 2 6. 10 or 1 8 8 7. 48 8. 11 9. 15.2 10. 1.6
1. 3.73 2. 0.56 3. 0.66 4. 360 5. 3,600 6. 256 7. 145 8. 73 9. 6.4 10. 0.08
1. 18.43 2. 10.47 3. 19,590 4. 5,738 5. 723 6. 174 7. 5.3 8. 516 9. 24 1 10. 13 6 or 2 6
1. 210 2. 2,250 3. 32 4. 800 5. 87 or 1 17 2 6. 12 10 or 1 10 7. 10,015 8. 6,315 9. 19.9 10. 17.5
1. 5.84 2. 3.25 3. 4.85 4. 330 5. 3,300 6. 193 7. 296 8. 97 9. 4.6 10. 0.46
1. 10.5 2. 8.9 3. 11,204 4. 10,294 5. 7,224 6. 510 7. 6.7 8. 603 9. 15 10. 11 19
1. 3,600 2. 4,884 3. 68 4. 600 3 5. 12 9 or 1 9 2 6. 11 or 1 9 9 7. 210 8. 60 9. 32 10. 670
1. 6.56 2. 4.89 3. 5.77 4. 210 5. 2,100 6. 96 7. 89 8. 192 9. 4.8 10. 0.48
1. 31.35 2. 13.86 3. 720 4. 9 5. 2,514 6. 980 7. 6.2 8. 388 9. 28 6 10. 25
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
Friday
1. 3,600 2. 2,556 3. 19 4. 50 4 5. 13 9 or 1 9 5 6. 13 8 or 1 8 7. 72 8. 6 9. 14 10. 0.2
1. 9.88 2. 6.33 3. 2.23 4. 280 5. 2,800 6. 39 7. 86 8. 66 9. 0.3 10. 0.76
1. 14.74 2. 10.21 3. 17,776 4. 2,261 5. 704 6. 204 7. 3.7 8. 558 9. 36 4 10. 13 9 or 1 9
1. 560 2. 3,744 3. 42 4. 900 5 5. 13 8 or 1 8 4 6. 18 14 or 1 14 7. 10,308 8. 1,578 9. 18.2 10. 6.9
1. 4.02 2. 6.55 3. 7.45 4. 150 5. 1,500 6. 76 7. 109 8. 253 9. 8.8 10. 0.88
1. 11.9 2. 9.1 3. 13,274 4. 13,203 5. 5,067 6. 410 7. 4.8 8. 384 9. 36 2 10. 12
1. 5,400 2. 3,812 3. 97 4. 700 2 5. 14 12 or 1 12 1 6. 20 19 or 1 19 7. 90 8. 80 9. 96 10. 820
1. 8.64 2. 3.79 3. 4.09 4. 540 5. 5,400 6. 85 7. 418 8. 268 9. 6.7 10. 0.67
1. 33.71 2. 13.91 3. 540 4. 9 5. 3,829 6. 870 7. 9.2 8. 468 9. 24 6 10. 25
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
Ninja Challenge
No, 40 x 8 = 320 and 760 – 400 = 360.
756
No, 900 x 2 = 1,800, which is 200 more than 1,600.
68
No, 12 + 9 = 21 No, because and 0.5 + 0.4 = 1,384 + 3,394 = 0.9. 21 + 0.9 = 4,778. 21.9.
No, 7,000 + No, 23.6 – 14.3 4,000 = 11,000; = 9.3. 300 + 700 = 1,000; and 58 + 27 = 85. 11,000 + 1,000 + 85 = 12,085.
136
Arithmetic_Ninja_For_Ages_8-9_9781801990639_app.indd 136
No, 19 of 72 is 8, and 8 x 8 is 64.
Arithmetic Ninja 8-9 © Andrew Jennings, 2022
15/09/2022 09:52