Thank you for viewing! This is a set of the Binomial Cube and Trinomial Cube, Montessori sensorial materials. ＜Binomial Cube＞ This material consists of 8 cubes and rectangular prisms, allowing children to build and visually understand the formula (a + b)³. Each solid represents a term in the expansion of the formula. ＜Trinomial Cube＞ This material consists of 27 cubes and rectangular prisms, allowing children to build and visually understand the formula (a + b + c)³. Each solid represents a term in the expansion of the formula. Please note that there may be wood burrs, minor scratches, uneven coloring, and paint chipping from the time of purchase. As this is an inexpensive, imported product, please understand these imperfections before purchasing. Type... Building Blocks Popular Keywords... Montessori