"1001 problems for mental arithmetic" is a collection of problems that will help develop thinking, logic and mathematical abilities. The author Serhiy Oleksandrovych Rachynskyi has prepared a unique collection of tasks of various levels of difficulty, from simple to challenging. This book will be an excellent tool for training the brain, improving mathematical skills and developing creative thinking. Tasks are presented in the form of riddles, logical challenges and interesting mathematical puzzles that will help the reader not only to have fun, but also to improve their calculation abilities. "1001 problems for mental arithmetic" is not just a book, but a study guide that will delight and interest both beginners and experienced math lovers.