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Grade 1 · Math · Building Confidence

Free Subtraction Within 20 worksheet - version 20

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 · Building confidence · 14 questions · Version PG-IGVWGJ-1PAM

Free printable
1.1 - 0 =
2.7 - 0 =
3.16 - 10 =
4.11 - 10 =
5.12 - 12 =
6.15 - 14 =
7.9 - 2 =
8.4 - 4 =
9.6 - 3 =
10.2 - 0 =
11.5 - 5 =
12.20 - 1 =
13.3 - 2 =
14.9 - 7 =
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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 20
  1. 1 - 0 =1
  2. 7 - 0 =7
  3. 16 - 10 =6
  4. 11 - 10 =1
  5. 12 - 12 =0
  6. 15 - 14 =1
  7. 9 - 2 =7
  8. 4 - 4 =0
  9. 6 - 3 =3
  10. 2 - 0 =2
  11. 5 - 5 =0
  12. 20 - 1 =19
  13. 3 - 2 =1
  14. 9 - 7 =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.