(Add/Sub) Matching "Fact Families"
__1. 12 + _= 24A. 24 - 12 = _
__2. 15 + 5 =B. 38 + 4 = _
__3. 20 - _ = 13C. 21 + 15 = _
__4. 31 + 9 = _D. 65 + _ = 75
__5. 36 - _ = 21E. 22 - 10 = _
__6. 42 - _= 38F. 47 + 7 = _
__7. 54- 7= _G. 20 - _ = 15
__8. 75 - 10 = _H. 18 - 14 = _
__9. _ + 4 = 18I. 7 + _ =20
__10. _ + 12 =22J. 40 - 31 =_
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