The book "Number Systems and Representation of Numbers in Computers . The textbook is an indispensable source of knowledge for all who are interested in the basics of computer science and computer technology. The author’s team, which gathered under one cover the experience and expertise of many specialists, invites readers to plunge into the fascinating world of numbers, number systems and their role in the work of electronic computers. From the very beginning, the book draws attention with its structure and accessibility of presentation. It covers a wide range of topics, ranging from the simplest number systems, such as binary and decimal, to more complex concepts related to the representation of numbers in computer memory. Each chapter is carefully worked out so that the reader can not only learn the theoretical aspects, but also see their practical application. This makes the manual ideal for both technical students and self-taught students seeking to expand their knowledge in programming and computer architecture. The book will be especially interesting for those who study mathematics, computer science or programming. Students, graduate students and even teachers will find useful materials in it to prepare for classes and exams . But not only professionals in the field of IT will be able to benefit from it . Anyone who wants to understand how computers work and how they process information will find this manual a lot of interesting and useful. The topics raised in the book cover not only the theory, but also the practical aspects of working with numbers in various number systems. The reader will learn how numbers are converted from one system to another, what coding methods exist, and how this knowledge is applied to real-world problems. This makes the book particularly relevant in the digital age, when understanding the basics of working with data becomes a necessary skill. The style of the authors is clear and logical, which makes it easy to assimilate even the most complex concepts. Each section is accompanied by examples and tasks that help to consolidate the material. This makes the tutorial not only informative, but also interactive, which is especially important for effective learning. If you are already familiar with other works of authors, such as "Basics of programming" or "