A game inspired by the activity of Montessori called the «Friends of Ten» to teach the child how to count to 10 and make the first simple additions. The set contains 11 cards to count with your fingers, 11 cards in quantities, 10 cards in numbers, 9 «10 pairs» cards, and a tab for additions. In the beginning, the child is called upon to combine hand cards, quantity cards and numerical symbols, to learn how to count to 10. Then, thanks to the «Friends of 10» cards, it can entertain itself by looking for all the combinations of quantities that have the sum of 10. So hes going to spontaneously drive to do his first mathematical operations.