8 - _____ + 9= 17 so 17 - 9 = _____, 7 - ______ + 2 = 9 so 9 -2 = ________, 3 - _____+ 14 = 17 so  17 - 14 =________, 14 - ______+ 2 = 16 so 16 - 2 = ______, 6 - _______ + 4 = 10 so  10 - 4 = _______, 13 - _______+ 4 = 17 so  17 - 4 = _______, 2 - _______ + 1 = 3 so  3 - 1 = ________, 12 - _______+ 3 = 15 so  15 - 3 = 12, 5 - _______+ 9 = 14 so  14 - 9 = _______, 17  - ________+ 3 = 20 so 20 - 3 = _______, 16 - ________+ 4 = 20 so  20 - 4 = _______, 15 - ________+ 2 = 17 so  17 - 2 =_______, 11  - ________+ 5 = 16 so  11 + 5 = _______, 4 - _________ + 15 = 19 so    19 - 15 = ______, 18 - _________+ 1 = 19 so 19 - 1 = _______,

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