A setting consisting of a 2×5 rectangular array which is used to support children’s thinking about combinations to 10 (for example, 7+3) and combinations involving 5 (for example, 7 is 5+2).
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A setting consisting of a 2×5 rectangular array which is used to support children’s thinking about combinations to 10 (for example, 7+3) and combinations involving 5 (for example, 7 is 5+2).