7+4 - 11, 6+6 - 12, 19-6 - 13, 7+7 - 14, 11+4 - 15, 8+8 - 16, 20-3 - 17, 9+9 - 18, 12+7 - 19, 10+10 - 20, 5+5 - 10, 12-3 - 9, 4+4 - 8, 10-3 - 7, 3+3 - 6, 15-10 - 5, 7-3 - 4, 8-5 - 3, 10-8 - 2, 16-15 - 1,

Addition and Subtraction Facts Within 20

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