Abstract: The instant invention relates to an aid for the carrying out of a didactic game in order that any (n) based number system may be learned.It consists of a series of containers decreasing in size, each containing an (n) number of smaller containers which are equal to each other; the smallest container holds an (n) number of pieces each representing a numerical unit. A desk is provided with colored squares or frames arranged in such a way that the last square (frame) on the right is of the same color as the unit of the first order, the penultimate the same color as the unit of the second order and so on.