Encyclopedia of Elementary Mathematics . Book 1. Arithmetic" edited by P. C. Alexandrova is not just a textbook, but a real find for anyone who wants to understand the basics of mathematics more deeply. This book will be a faithful companion for both schoolchildren and students, as well as for adults seeking to refresh their knowledge in arithmetic. It contains all the key concepts and methods that form the foundation of mathematical science. From the first pages, the reader plunges into the fascinating world of numbers and operations with them. The book covers a wide range of topics, ranging from the simplest arithmetic actions - addition, subtraction, multiplication and division - to more complex concepts such as fractions, percentages and proportions. Each section is written with clarity and accessibility, which makes the material understandable even for those who do not have deep knowledge in mathematics. One of the features of the Encyclopedia of Elementary Mathematics is that it not only expounds facts, but also offers the reader many examples and tasks that help to consolidate the material studied. This makes the book an ideal guide for self-study as well as exam preparation. In it you will find both simple tasks and more complex ones, which allows each reader to choose the level of complexity corresponding to his knowledge. Who can like this book? First of all, it will be useful for schoolchildren who want to improve their skills in mathematics and prepare for control work . Students studying technical or economic specialties will also find it a lot of useful, since arithmetic is the basis for more complex mathematical disciplines. In addition, the book will be interesting to adults who want to refresh their knowledge or help their children in their studies .. Topics raised in the book go beyond simple arithmetic operations. The authors discuss the importance of mathematical thinking, logic and analytical skills, which are developed through the study of arithmetic. The book highlights how mathematics permeates all areas of our lives, from financial planning to scientific research. This makes it not only a textbook, but also a source of inspiration for readers who want to see how mathematics is applied in the real world. Editor P. C. Alexandrov is known for his work in mathematics and pedagogy, and his writing style is clear and logical. It skillfully combines a scientific approach with accessibility, which allows readers to easily absorb material. In addition to this book, Alexandrov is the author and editor of many other tutorials that also deserve attention. Encyclopedia of Elementary Mathematics . Book 1. Arithmetic" is not just a collection of theoretical knowledge, but a full-fledged training course that will help each reader not only to master arithmetic, but also to love mathematics. If you are looking for a high-quality and fascinating mathematics textbook, this edition will be an excellent choice. It will not only enrich your knowledge, but also open new horizons in understanding numbers and their role in our lives.