1. A mathematics visual aid useful in teaching the importance of the place-value components 1, 10, 100,. .. 10.sup.n (n=0, 1, 2. .. ), which comprises: a support member; divider means formed on said support member for defining a plurality of columns of work areas and first and second rows of work areas; and a plurality of sets of workpieces, the number of said sets corresponding to the number of said columns of work areas, a unique set of workpieces rotatably mounted within each of said columns, all the workpieces within each of said sets sharing a common physical configuration which differs from the common physical configuration shared by the workpieces in each of the other sets.