This challenging worksheet pushes fact family reasoning toward word-problem readiness. Part A asks which set actually forms a family (3, 8, 11 works; 4, 7, 13 does not), pairs 16 - 9 = 7 with 9 + 7 = 16, solves a missing addend in 6 + ___ = 13, and identifies the 8-9-17 family from look-alike doubles like 9 + 9 = 18.

Part B drills the 5-8-13 family across all four equations, then ends with the doubles fact ___ + 9 = 18 to surface the special case where both parts are equal. Working through near-doubles and missing addends here is exactly what prepares first graders for two-step word problems in second grade.