Little Jeffrey places one block on top of two others as he busily constructs an elaborate block city. Although he is only two-and-one-half years old. Jeffrey understands that he has just made a “bigger” building by adding one block to two others. He understands this idea even though he does not yet know how to use the terms one. two, and three. But, by acting on his environment. Jeffrey is encountering the basic ideas that will gradually evolve into more sophisticated mathematics concepts. Only after repeated experiences of this type can Jeffrey develop the logical thinking skills necessary to express in words what has happened to his block structure.
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