22 + ? = 29, 6, 8, 5, 7, 10, 82 - ? = 74, 10, 9, 8, 7, 5, ? + 53 = 59, 9, 10, 5, 7, 6, 66 - 15 = 51, true, false, 16 + 4 = 20 fact family with 20 + 4 = 16 , true, false.

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