<p>This cube represents the equation (a+b+c) cube in concrete form and differs from the Trinomial Cube in that the component pieces are color-coded to represent hierarchical values from one unit to one million. This makes it possible for the child to equate an arithmetical value to each of the cube and prisms. The 27 pieces are contained in a hinged box that opens out for easy access. A lid printed with the trinomial square pattern is included. (For age 6- 12)</p>