An arithmetical strategy involving partitioning a small number into two parts without counting, typically with both parts in the range 1 to 5, for example partitioning 6 into 5 +1, 4+2 and so on.
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An arithmetical strategy involving partitioning a small number into two parts without counting, typically with both parts in the range 1 to 5, for example partitioning 6 into 5 +1, 4+2 and so on.