Baby's first number with a 15-ring wooden abacus! Counting on calculators for children is a great way to develop a child's intellectual abilities. Mankind has not come up with a better visual representation of the decimal calculation system than calculators. By moving the bones, you can learn the composition of a number, quickly learn the principles of addition and subtraction. The game with the calculator corresponds to the basic principles of the Montessori method. A game with a calculator is: development of logic, thinking training of fine motor skills, sensors, eye sight the formation of the first numeracy skills, a positive first idea about the concept of "mathematics" educates purposefulness, perseverance, consistency in actions solving simple examples in a game form (for children 4+)