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Subtraction Within 20 — Crossing Ten is a free printable Grade 1 maths worksheet on subtraction that bridges back over ten, aligned to Common Core standard 1.OA.C.6. It prints 16 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 18 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.

Subtraction Within 20 — Crossing Ten

1.OA.C.6

NameDate

Work out each answer.

1.20 − 3 =
2.12 − 3 =
3.17 − 9 =
4.20 − 7 =
5.14 − 7 =
6.20 − 2 =
7.11 − 3 =
8.18 − 9 =
9.11 − 9 =
10.11 − 2 =
11.20 − 9 =
12.20 − 5 =
13.11 − 4 =
14.12 − 9 =
15.12 − 4 =
16.13 − 7 =

LessonPrint · 1.OA.C.6 · Set 18 · free to copy for classroom use

Answer key — Subtraction Within 20 — Crossing Ten

Set 18. Prints on its own sheet.

  1. 1.17
  2. 2.9
  3. 3.8
  4. 4.13
  5. 5.7
  6. 6.18
  7. 7.8
  8. 8.9
  9. 9.2
  10. 10.9
  11. 11.11
  12. 12.15
  13. 13.7
  14. 14.3
  15. 15.8
  16. 16.6

Last reviewed 2026-09-05. Aligned to 1.OA.C.6 of the Common Core State Standards for mathematics.