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

Subtraction within 20

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