9 + 3 =, 6, 12, 5 + 8 =, 13, 3, 9 + 6 =, 8, 15, 10 + 7, 17, 4, 8 + 8, 11, 16, 9 + 9 =, 9, 18, 10 + 2 =, 12, 11, 6 + 8, 14, 11, 5 + 9, 15, 14, 9 + 8, 18, 17, 7 + 7, 14, 16, 10 + 10, 19, 20

addition within 20

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