The trinomial cube is a concrete representation of the algebraic formula (a+b+c)³. The cubes and prisms represent the factors of the equation . The primary montessori child explores the trinomial cube as a sensorial activity of visual discrimination of color and form . The trinomial cube is contained in a wooden box with lid. Enable children to understand the color, space size, after the practice,indirectly prepare the child for difficult mathematical concepts. › See more product details