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Grade 1 · Math · Building Confidence

Free Addition Within 20 worksheet - version 15

Practice addition facts and strategies with sums through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.

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Addition Within 20

Grade 1 · Building confidence · 14 questions · Version PG-1CD3YD3-PNVM

Free printable
1.14 + 1 =
2.2 + 1 =
3.18 + 2 =
4.19 + 1 =
5.3 + 17 =
6.5 + 15 =
7.12 + 5 =
8.13 + 5 =
9.17 + 3 =
10.13 + 4 =
11.7 + 8 =
12.14 + 4 =
13.20 + 0 =
14.6 + 12 =
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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 15
  1. 14 + 1 =15
  2. 2 + 1 =3
  3. 18 + 2 =20
  4. 19 + 1 =20
  5. 3 + 17 =20
  6. 5 + 15 =20
  7. 12 + 5 =17
  8. 13 + 5 =18
  9. 17 + 3 =20
  10. 13 + 4 =17
  11. 7 + 8 =15
  12. 14 + 4 =18
  13. 20 + 0 =20
  14. 6 + 12 =18

Worked example

8 + 7 = 15. Make ten: 8 + 2 + 5 = 15.

Common mistake

Losing part of the second addend when making ten.

Helpful hint

Look for a way to make 10 first.