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A book for children and adults who have problems with mathematics.
Robert does not like dreams. After all, something terrible happens in dreams - sometimes he is swallowed by a giant fish, then he goes somewhere on an endless slide, and if in a dream he sees a beautiful bicycle in the basement, then in reality it is not there. What a disappointment! Just like dreams, Robert does not like mathematics. After all, only his math teacher is interested in how long it takes five bakers to bake 88 pretzels.
One day in a dream, Robert meets a numerical devil - Teplotaxl. But instead of scaring the boy, the old devil begins to tell Robert about ordinary and leaping numbers, about pulling turnips and other mathematical principles.
For twelve nights in a row, Teplotaxl talks about mathematical terms in a simple and interesting language. And Robert, after each dream, begins to get better at solving the school teacher's boring problems.