Table of contents : Murderous maths – are you kidding? 7 The basics 12 Professor Fiendish's fatal fungus 19 The best invention ever! 27 How our "ten" system works 32 Rubbish things about calculators 37 The long and short of it 45 Time? 52 Clocks 60 The quest for the right angle 72 The hard boys of maths 81 The magic square 103 Short-cuts 107 A really good magic trick 116 How to handle big numbers 125 Symmetry and the mindmashing maze 136