Children's games, especially active ones and with rules, are very important for the development of mathematical thinking. Do you know why? It's simple. Mathematical thinking is not only numbers, it is also abstract thinking, the ability to calculate a situation and the ability to make non-standard decisions. Even success in such a simple game as “hide and seek” depends on it. “Where is mathematical thinking in hide and seek?” - you ask. Neuropsychologists say: “It begins right here, in the ability to play the simplest and most famous games!” Well, what? One, two, three, four, five - are we going to look? In the book you will find a large number of games and exercises, specially selected or developed by neuropsychologists. The materials will be interesting and useful both to specialists working with children: psychologists, educators, and to all parents who experienced stress from encounters with mathematics in childhood.