It consists of four sheets that form different ways of adding or building "the number", using the code of the colors corresponding to the Montessori beads, but in this case they are not beads but squares. The first page is for control. The second, the child traces each square, colors them with the corresponding colors and writes the numbers, then writes the sum, (the numbers are suggested in point numbers) The third, is similar to the second with the difference that in the sum the numbers are no