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Grade 1 · Math · Building Confidence

Free Subtraction Within 20 worksheet - version 10

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-1LUZSUW-1PAM

Free printable
1.19 - 6 =
2.8 - 7 =
3.15 - 8 =
4.16 - 3 =
5.15 - 7 =
6.3 - 3 =
7.12 - 0 =
8.18 - 4 =
9.8 - 6 =
10.17 - 17 =
11.17 - 15 =
12.4 - 4 =
13.10 - 6 =
14.12 - 3 =
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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 10
  1. 19 - 6 =13
  2. 8 - 7 =1
  3. 15 - 8 =7
  4. 16 - 3 =13
  5. 15 - 7 =8
  6. 3 - 3 =0
  7. 12 - 0 =12
  8. 18 - 4 =14
  9. 8 - 6 =2
  10. 17 - 17 =0
  11. 17 - 15 =2
  12. 4 - 4 =0
  13. 10 - 6 =4
  14. 12 - 3 =9

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.