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Grade 1 · Math · Building Confidence

Free Addition Within 20 worksheet - version 8

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-1TD6HGZ-PNVM

Free printable
1.20 + 0 =
2.7 + 13 =
3.2 + 18 =
4.17 + 3 =
5.17 + 1 =
6.7 + 7 =
7.5 + 5 =
8.7 + 2 =
9.9 + 2 =
10.16 + 4 =
11.0 + 13 =
12.1 + 19 =
13.9 + 8 =
14.15 + 5 =
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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 8
  1. 20 + 0 =20
  2. 7 + 13 =20
  3. 2 + 18 =20
  4. 17 + 3 =20
  5. 17 + 1 =18
  6. 7 + 7 =14
  7. 5 + 5 =10
  8. 7 + 2 =9
  9. 9 + 2 =11
  10. 16 + 4 =20
  11. 0 + 13 =13
  12. 1 + 19 =20
  13. 9 + 8 =17
  14. 15 + 5 =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.