When multiplying like bases, keep the base the same and add the exponents. This rule can be demonstrated with the combo kit and the basic ops kit or a combination of both by building the corresponding rectangles. The first factor is the across distance of the rectangle, the second factor is the up distance of the rectangle, and the product is the total rectangle.
1 across and 1 up = 1
1 across and x up = x
x across and x up = x square
x across and x square up = x cube