The Number Devil
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The Number Devil is a book for children, basically which explores maths by Hans Magnus Enzensberger.
The story of this book is very intricately woven into a mathematical journey and a children's story book. It follows the story of Robert, a boy who does not enjoy math class at school because of his teacher, Mr. Bockel. The Number Devil (Later revealed as Teplotaxl) appears to Robert in a sequence of 12 dreams, one a night, introducing him to the interesting side of math by using simple and made-up language designed to be understandable by children (the index has a disclaimer warning that readers not to use the fictional terms when talking to adults), for example, square roots are referred to as "rutabega numbers", after the plant Rutabega. By the end Robert goes to see Number Heaven/Number Hell(they are the same place) and becomes a fifth class number devil himself. The book culminates with Robert using his new-found skills to work out a problem set by Mr. Bockel. There are also some made-up terms which are not to be used in real-life but otherwise it would sound very unappealing to children. Better still, these can be understood by adults so there is not much of a problem.
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