After being introduced to the decimal system using the Golden Bead Material, the Stamp Game provides opportunity for individual practice in the operations of addition, subtraction, multiplication and division. In a step towards abstraction, the quantity and symbols of the decimal system are combined and are represented by each stamp. This material is contained in a wooden box with 6 compartments. Stamps are organized according to hierarchical colors green, blue and red and according to the numbers stamped on them 1, 10, 100 and 1000. The material also includes skittles and color counters.