In the Kingdom of Ingenuity. Arithmetic Puzzles and Problems

«In the Kingdom of Ingenuity» by Russian educator-mathematician Emelyan Ignatiev — an exciting journey into the world of numbers, where logic meets wit, and arithmetic turns into an engaging quest. You will encounter ancient puzzles, tricky numerical riddles, and unconventional problems that will make your brain work at full capacity. This book is suitable for both beginner mathematicians and adult readers who wish to maintain their mental sharpness.