This book will teach you to count faster in your mind than on a calculator, memorize large numbers and enjoy mathematics. Anyone can multiply, divide, raise to a power and perform other operations on large numbers in the mind and at high speed. To do this, you do not need to solve tens of thousands of examples and study for years - it is enough to use the simple techniques described in this book. They are available for people of any age and any mathematical ability. For everyone who loves mathematics, and for those who want to learn how to make any calculations with lightning speed in their minds.