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Grade 1 · Math · On Level

Free Subtraction Within 20 worksheet - version 2

Build subtraction fluency with numbers through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.

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Subtraction Within 20

Grade 1 · On-level practice · 14 questions · Version PG-IM2Q4Z-IB6W

Free printable
1.4 - 2 =
2.20 - 4 =
3.4 - 1 =
4.18 - 15 =
5.7 - 3 =
6.19 - 3 =
7.12 - 1 =
8.15 - 7 =
9.16 - 6 =
10.10 - 8 =
11.1 - 1 =
12.2 - 1 =
13.18 - 6 =
14.7 - 5 =
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Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 2
  1. 4 - 2 =2
  2. 20 - 4 =16
  3. 4 - 1 =3
  4. 18 - 15 =3
  5. 7 - 3 =4
  6. 19 - 3 =16
  7. 12 - 1 =11
  8. 15 - 7 =8
  9. 16 - 6 =10
  10. 10 - 8 =2
  11. 1 - 1 =0
  12. 2 - 1 =1
  13. 18 - 6 =12
  14. 7 - 5 =2

Worked example

16 - 7 = 9. Break 7 into 6 and 1: 16 - 6 - 1 = 9.

Common mistake

Switching the order of the numbers because subtraction is not commutative.

Helpful hint

Count back to 10, then subtract what remains.