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Grade 1 · Math · Building Confidence

Free Addition Within 20 worksheet - version 19

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-1918Q1F-PNVM

Free printable
1.20 + 0 =
2.19 + 1 =
3.13 + 0 =
4.12 + 8 =
5.0 + 19 =
6.7 + 11 =
7.9 + 11 =
8.15 + 5 =
9.0 + 18 =
10.18 + 2 =
11.7 + 13 =
12.11 + 9 =
13.1 + 15 =
14.13 + 7 =
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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 19
  1. 20 + 0 =20
  2. 19 + 1 =20
  3. 13 + 0 =13
  4. 12 + 8 =20
  5. 0 + 19 =19
  6. 7 + 11 =18
  7. 9 + 11 =20
  8. 15 + 5 =20
  9. 0 + 18 =18
  10. 18 + 2 =20
  11. 7 + 13 =20
  12. 11 + 9 =20
  13. 1 + 15 =16
  14. 13 + 7 =20

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.