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Grade 1 · Math · Building Confidence

Free Subtraction Within 20 worksheet - version 17

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-1NSX0PP-1PAM

Free printable
1.19 - 15 =
2.13 - 7 =
3.3 - 0 =
4.7 - 4 =
5.20 - 19 =
6.20 - 4 =
7.3 - 1 =
8.8 - 6 =
9.5 - 0 =
10.18 - 14 =
11.6 - 3 =
12.15 - 8 =
13.20 - 14 =
14.12 - 10 =
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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 17
  1. 19 - 15 =4
  2. 13 - 7 =6
  3. 3 - 0 =3
  4. 7 - 4 =3
  5. 20 - 19 =1
  6. 20 - 4 =16
  7. 3 - 1 =2
  8. 8 - 6 =2
  9. 5 - 0 =5
  10. 18 - 14 =4
  11. 6 - 3 =3
  12. 15 - 8 =7
  13. 20 - 14 =6
  14. 12 - 10 =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.