🔢Math Standard
Fact Families Worksheet (to 20)
Write the four facts in each fact family using three numbers within 20.
2nd Grade 12 min
✓ Answer key
2nd Grade · Math
2nd Grade Fact Families Worksheets
Fact families connect addition and subtraction through the same three numbers. These free printable 2nd grade fact families worksheets build automatic recall of facts to 20 by showing students the four related facts in each family, using triangles and missing-number problems. Every worksheet includes a printable answer key and easy, standard, and challenge versions for differentiation.
Reviewed by ClassReady Editorial Team Last updated August 2026
Before this skill
- Addition facts to 20
- Subtraction facts to 20
- Understanding part-part-whole
Common mistakes to watch for
- Writing the same fact twice instead of the four distinct facts
- Using the wrong sign when rearranging the family
- Forgetting one of the two subtraction facts
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Frequently Asked Questions
What is a fact family in 2nd grade?
For 6, 8, and 14, the family is 6+8=14, 8+6=14, 14-8=6, and 14-6=8. The same three numbers make four related addition and subtraction facts.
How do fact families build fluency?
Learning four facts together through their relationship halves the number of isolated facts to memorize and deepens number sense for mental math.
Are these fact family worksheets free and printable?
Yes. Every worksheet is a free, printable PDF with an answer key, and no sign-up is required.