1 + 5 =, 2 + 6 =, 0 + 8 =, 2 + 7 =, 4 + 3 =, 3 + 2 =, 5 + 4 =, 6 + 1 =, 9 + 0 =, 1 + 7 =.

Addition within 9 ( Abacus )

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