(2) 4-6 Translated by Michael Henry Heim. Illustrated by Rotraut Susanne Berner. Self-described math-phobe Robert begins having surreal dreams in which he encounters a number devil, who teaches him, just for starters, the crucial importance of zero and how to make all numbers out of ones. More difficult concepts are deliberately repeated in several dreams; occasional additional problems are provided for greater challenges. Infinitely more fun than the usual word-problem assignment.

Reviewer: Daniel Brabander | Horn Book Magazine Issue: November, 1998