Monday, October 30, 2017

Cubing Trinomials

Some students explored the trinomial cube today.  The cube is first introduced as a sensorial material in the primary classroom.  What seems like a basic wooden-block puzzle is actually used again in the upper elementary classroom to discover the formula for cubing trinomials (three digit numbers).  Each block represents a different step in the process:

(A + B + C)3 = A3 + 3A2B + 3AB2 + 3A2C + B3 + 6ABC + 3B2C +3AC+ 3 BC2 + C3 

the trinomial cube 

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