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3 year old working with small number rods.
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3 year old working with the short bead stairs.
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3 year old mixing primary colors with the goal of creating secondary colors.
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4 year old grading color tablets from lightest to darkest.
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3 year old working with a trinomial cube, which is the concrete representation of the algebraic formula (a+b+c)3
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4 year old discovering the sensorial and visual discrimination of size of the knobless cylinders