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Description: A wooden box containing 27 wooden cubes painted in the colours red, black, blue and yellow. The box has a special internal hinge, which allows the sides to open out flat permitting unhindered access to the cubes. The control is screened on the lid. Purpose: Concrete representation of the trinomial formula (a + b + c) 3 To develop the child’s perception of differences in proportion in 3 dimensions and to encourage the perception of a mathematical pattern. An indirect preparation of the child for algebra.
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