Fact Families Within 20
1.OA.4 — Understand subtraction as an unknown-addend problem
Build this worksheet below — all three levels and the answer key, ready to print.
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What is on the three Fact Families Within 20 worksheets
- Support
- draws a number bond beside every problem.
- On level
- The grade's own level, with no drawings.
- Challenge
- uses the harder cases, and drops the familiar layout.
Example problems from the on-level sheet
- 8 + ___ = 10
- 9 + ___ = 16
- 6 + ___ = 7
Every sheet is generated, so the numbers are different each time you make one.
Before this: 1.OA.1 — add and subtract within 20 to solve word problems involving add-to, take-from, put-together, take-apart, and compare situations, with unknowns in all positions.