Check the listing for details. Montessori Trinomial & Binomial Cube Set for Sensorial Development. Color: Multicolor, Condition: New. Listed at 55.00 USD. Both Binomial Cube and Trinomial Cube are Montessori sensorial materials that consist of colored wooden blocks inside of a hinged wooden box.The binomial box is made up of 8 blocks – 2 cubes and 6 prisms. And the trinomial cube is made up of 27 blocks – 3 cubes and 24 prisms. The child is to deconstruct and reconstruct the two Cube using a certain method and noting certain characteristics of the material along the way, specifically the pattern of the blocks. This Montessori Trinomial & Binomial Box Set is perfect for children's sensorial development. The purpose of the set is to refine visual discrimination (color, pattern, shape). It also build concept of binomial and trinomial equation for future algebra learning. Size for each cube:Binomial cube: 4.8*4.8*3.9 inches. Trinomial cube: 5.2*5.2*4.1 inches.