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Learning about mathematics in a fun way
Small disclaimer: I read this as a child and really enjoyed it, so the nostalgia is strong.
Robert, a young boy who does not care for his maths class, meets a being that introduces himself as the 数の悪魔 in his dream. Over the course of twelve dreams, the 数の悪魔 teaches Robert about various mathematical principles.
The book is not meant to teach maths, but rather is trying to show kids that mathematics can be fun. Even though it is written for children, the mathematical concepts introduced are surp