The book is compiled in accordance with the new Federal State Educational Standard for Preschool Education and Upbringing and will become an excellent assistant in the education and development of children 5-6 years old. Studying the book, the child will get acquainted with the score within 20, learn the composition of the number, learn how to solve examples and problems of addition and subtraction using the number line, compare numbers, and also consolidate orientation skills in space and on a sheet of paper, practice attention, memory, logical thinking. Tasks located as they become more complex and focused on the real capabilities of children will help develop the intellectual abilities of the child.