the stamp game is a material for the development of the mathematical mind that is offered after the child has already known the "Decimal System", as this is a work that leads the child towards abstraction. It allows all four arithmetic operations to be carried out, even with large numbers, in a way that is easy and enjoyable for the child. The material is made up of a box divided into 8 compartments; four of these compartments are intended to house the square wooden tiles, of equal size, coloured hierarchically, with the respective symbol marked on them: 1 - 10 - 100 - 1,000; three compartments are intended to house the little wooden men, also in the hierarchical colours green, red and blue; in the last compartment, there are tokens, also coloured in the hierarchical colours.