The book "75 problems in elementary mathematics - simple, but" by Alexander Isaacovich Ostrovsky is a fascinating and informative publication that will become a real helper for everyone who wants to improve their mathematical skills. This book is not just a collection of tasks, but a real find for those who seek to understand the basics of elementary mathematics, as well as for teachers who want to diversify their lessons. In 75 Tasks, Ostrovsky offers readers a unique approach to the study of mathematics. Each task, although it seems simple at first glance, requires thoughtful analysis and creative approach. This makes the book not only useful, but also interesting to read. Readers will be able to see how the usual mathematical operations can be used in non-standard situations, which develops logical thinking and creativity. The questions that are raised in the book concern not only numbers and formulas, but also real-life situations where mathematics plays a key role. The book will be especially interesting for schoolchildren, students, as well as anyone who wants to refresh their knowledge in the field of mathematics. It is suitable both for self-study and for use in the classroom. Teachers will find a lot of ideas for lessons in it, and parents will be able to help their children in mastering the subject that often causes difficulties. It is important to note that the book is suitable for readers of different ages - from younger schoolchildren to adults who want to improve their skills. The topics raised in the book cover a wide range of mathematical concepts: from simple arithmetic operations to more complex problems requiring logical thinking. Ostrovsky skillfully combines theory and practice, which allows the reader not only to solve problems, but also to understand how to apply the knowledge gained in life. This makes the book particularly valuable in today's world, where mathematical skills are becoming increasingly in demand. The style of Alexander Isaakovich Ostrovsky is distinguished by accessibility and clarity. He is able to explain complex things in simple language, which makes his books understandable even for those who do not have deep knowledge in mathematics. Ostrovsky is the author of several popular textbooks and manuals, which were highly appreciated by both students and teachers. His experience and ability to find an approach to the reader make each of his books a real find for lovers of mathematics. If you are looking for literature that will help you or your children to understand mathematics, "75 problems in elementary mathematics - simple, but" will be an excellent choice. This book not only develops problem solving skills, but also forms an interest in mathematics as a science. Readers who like to solve puzzles, find non-standard solutions and just enjoy the learning process will definitely appreciate this publication. Do not miss the opportunity to immerse yourself in the world of elementary mathematics with Alexander Isakovich Ostrovsky . His book is not just a textbook, but an exciting journey into the world of numbers, logic and creativity.