This challenging worksheet asks first graders to reason about fact families instead of just completing them. Part A poses four multiple-choice questions: picking the partner of 6 + 9 = 15 from distractors like 14 - 9 = 5, finding the missing total for 7, 8, ___ (15), spotting that 6 + 6 = 12 does NOT belong to the 5, 6, 11 family, and matching 9 + 8 = 17 with 17 - 9 = 8.

Part B then drills the 4-7-11 family in full and ends with a missing-addend prompt, ___ + 6 = 14, that requires children to reverse the relationship. The mix of recognition and inverse-thinking is what cements fact families as a tool rather than a list.