Author of the book, well-known popularizer of science I. and . Perelman, appears before us in an unusual capacity - a magician and a magician . He gives his reader the opportunity to see amazing tricks, then revealing their mathematical secrets. The astonished reader sees extraordinary and “miraculous” things, which, as it turns out, are based on simple arithmetic calculations. I. and . Perelman collected interesting experiments and amazing tricks that will require the most ordinary objects, always at hand. All this will surely arouse your and your child’s interest in exact sciences and brighten your leisure time. These tricks are “honest and conscientious”, and, having shown intelligence and ability to reason, everyone can do them. You will learn something that others do not even know about. And by showing them to your friends and acquaintances, you can work wonders like a professional magician. You will amaze the imagination of your viewers, turning into a mathematical genius before their eyes.