Convenient for the child to work at home if he is already using the book "Picbille" to the school or if you have at home. Gradually it combines different figures for the number of balls in the box boxes and assimilates more easily around the first calculations of 5 and 10 (3 = 5-2 = 5 or 6 + 1). Gradually it advances towards greater amounts (numbers 11 to 19, tens ...).
