Quick Count Back: 9 - 2, 11- 3, 18 - 1, 17 - 3, 6 - 2, Take Half Fact: 18 - 9, 8 - 4, 12 - 6, 16 - 8, 14 - 7, Take All: 15 - 15, 11 - 11, 4 - 4, 8 - 8, 16 - 16, Using 10 to Subtract (-10, +1) or (- 10, +2): 13 - 9, 15 - 8, 14 - 9, 17 - 8, 16 - 9, Back to 10: 19 - 9, 14 - 4, 18 - 8, 17 - 7, 15 - 5, Subtract 10: 16 - 10, 14 - 10, 13 - 10, 15 - 10, 19 - 10, Make/Break 10: 10 - 8, 10 - 7, 10 - 4, 10 - 6, 10 - 5,
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Subtraction Strategy Sort
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Robynmay
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