An international bestseller that does for maths what Horrible Histories did to bring humanities to life Twelve-year-old Robert hates maths: his teacher sets his class boring problems and won't let them use their calculators. Then in his dreams Robert meets the Number Devil, who brings the subject magically to life, illustrating with wit and charm a world in which numbers can amaze and fascinate. Suddenly maths is nothing like the dreary, difficult process that so many of us dread, but a world of wonder that all begins to make sense. The Number Devil knows how to make maths devilishly simple. With fun and helpful illustrations by Rotraut Susanne Berner, this is the perfect read for anyone fascinated by maths - or mystified by it. Learn all about: Negative numbers Prime numbers Square roots Triangular numbers Fibonacci numbers Infinite numbers Geometry Mathematical proofs 'This enterprising and imaginative book will play its part in rescuing children froma lifetime phobia of maths' Daily Mail 'Enzensberger has made Pythagoras the new Harry Potter... Explaining mathematical concepts in a clear and highly original way' Sunday Business Post