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Grade 1 · Math · On Level

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 · On-level practice · 14 questions · Version PG-10I1ISI-IB6W

Free printable
1.6 - 6 =
2.14 - 1 =
3.17 - 0 =
4.15 - 4 =
5.18 - 4 =
6.20 - 15 =
7.13 - 4 =
8.9 - 8 =
9.2 - 1 =
10.5 - 3 =
11.11 - 1 =
12.4 - 0 =
13.3 - 1 =
14.10 - 0 =
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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. 6 - 6 =0
  2. 14 - 1 =13
  3. 17 - 0 =17
  4. 15 - 4 =11
  5. 18 - 4 =14
  6. 20 - 15 =5
  7. 13 - 4 =9
  8. 9 - 8 =1
  9. 2 - 1 =1
  10. 5 - 3 =2
  11. 11 - 1 =10
  12. 4 - 0 =4
  13. 3 - 1 =2
  14. 10 - 0 =10

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.