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Grade 1 · Math · Building Confidence

Free Subtraction Within 20 worksheet - version 13

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-1MOYLXT-1PAM

Free printable
1.20 - 6 =
2.3 - 3 =
3.18 - 8 =
4.17 - 2 =
5.14 - 11 =
6.7 - 1 =
7.5 - 5 =
8.9 - 8 =
9.18 - 14 =
10.6 - 4 =
11.20 - 16 =
12.19 - 4 =
13.5 - 2 =
14.8 - 8 =
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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 13
  1. 20 - 6 =14
  2. 3 - 3 =0
  3. 18 - 8 =10
  4. 17 - 2 =15
  5. 14 - 11 =3
  6. 7 - 1 =6
  7. 5 - 5 =0
  8. 9 - 8 =1
  9. 18 - 14 =4
  10. 6 - 4 =2
  11. 20 - 16 =4
  12. 19 - 4 =15
  13. 5 - 2 =3
  14. 8 - 8 =0

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.