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Fact Families to 20 is a free printable Grade 1 maths worksheet on fact families crossing ten, aligned to Common Core standard 1.OA.B.3. It prints 10 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 25 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Fact Families to 20

1.OA.B.3

NameDate

Work out each answer.

1.13 − 12 =
2.8 − 5 =
3.20 − 12 =
4.1 + 15 =
5.14 − 11 =
6.16 − 5 =
7.14 − 12 =
8.16 + 2 =
9.6 + 8 =
10.10 − 7 =

LessonPrint · 1.OA.B.3 · Set 25 · free to copy for classroom use

Answer key — Fact Families to 20

Set 25. Prints on its own sheet.

  1. 1.1
  2. 2.3
  3. 3.8
  4. 4.16
  5. 5.3
  6. 6.11
  7. 7.2
  8. 8.18
  9. 9.14
  10. 10.3

Last reviewed 2026-09-05. Aligned to 1.OA.B.3 of the Common Core State Standards for mathematics.