Elementary Mathematics . Part 1. Arithmetic. Basics of Algebra. Combinatorics. Functions: Tutorial”, created by the team of authors, is a unique and comprehensive introduction to the world of basic mathematical concepts, which will become an indispensable assistant for students, schoolchildren and anyone who wants to strengthen their knowledge in the field of elementary mathematics. This book is a real guide to the fundamental sections that underlie mathematical thinking and serve as a solid basis for further study of the more complex sections of mathematics. The focus of this tutorial is arithmetic, which is revealed not only in terms of simple operations, but also with immersion in deeper concepts, such as the properties of numbers and their relationships. The authors masterfully explain how numbers work in different situations, demonstrating their application in real life and educational practice. A special place is given to the basics of algebra, where the reader will get acquainted with variables, equations and inequalities, which will help to develop logical thinking and the ability to solve various problems. Combinatorics, one of the most fascinating and practical parts of the book, reveals the secrets of counting and organizing data, which is especially relevant in the era of information technology and data analysis. Readers will learn about the principles of permutations, combinations and placements, which not only expands their horizons, but also helps to understand how complex systems and algorithms are built. At the end of the book, the authors introduce functions into the world - the most important section that underlies modern mathematics and its applications. Here, the concepts of graphs, dependencies and transformations are considered, which makes the material especially relevant for those who want to understand how mathematics describes the world around them. This book is ideal for high school students, elementary students, teachers and anyone who is interested in mathematics and wants to systematize their knowledge. Her style is clear, accessible and at the same time saturated with real-life examples, which makes complex topics understandable and fascinating. The authors use a variety of methods of presentation, including illustrations, practical tasks and logical puzzles, which contributes to the consolidation of knowledge and the development of analytical thinking. The peculiarity of this tutorial is its structure and consistency, which allows you to gradually and without unnecessary difficulties to immerse yourself in mathematics. The book not only explains the theoretical foundations, but also provides practical exercises that stimulate independent thinking and the ability to apply the knowledge gained. This approach is done by the book "Elementary Mathematics. Part 1" is a valuable tool for preparing for exams, olympiads and for self-study. If you are looking for a book that will help you understand the basics of mathematics, reveal its secrets and learn to think logically, then this work will be an excellent start for you. It combines scientific accuracy, pedagogical care and a lively style, which makes studying mathematics not only useful, but also an exciting adventure. Inspired by the works of famous authors in the field of educational literature and the promotion of mathematics, the team created a manual that deservedly takes its place in the library of everyone who appreciates knowledge and strives for intellectual development. Title: Elementary Mathematics . Part 1. Arithmetic. Basics of Algebra. Combinatorics. Functions is not just a textbook, but a key to understanding the fundamentals that underlie all mathematics and many other sciences. This book will be a reliable companion on the way to mathematical literacy and analytical thinking, opening the door to a fascinating and multifaceted world of numbers, structures and patterns.