Twelve-year-old Robert hates his maths teacher. He sets his class boring problems & wont let them use their calculators. Then in his dreams Robert meets the Number Devil who brings the subject magically to life illustrating with wit & charm a world in which numbers can amaze & fascinate where maths is nothing like the dreary difficult process that so many of us dread. The Number Devil" knows how to make maths devilishly simple."