Trinomial Cube

• The Trinomial Cube comes in after the child is introduced to the Binomial cube.
• This again is a perfectly fitting example of a child’s learning in concrete before going for abstract concepts.
• The trinomial cube is a concrete representation of the algebraic formula (a +b +c)3.
• The trinomial cube is contained in a wooden box with a lid, having two adjacent hinged sides that open out to display the 27 wooden component cubes and prisms painted red, blue, yellow, and black.
• The factors of the equation are represented by the cubes and prisms. 
• The child uses it for sensorial exploration, while the elementary child uses the trinomial cube as a concrete step towards algebraic expressions.

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