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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 9

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 · Stretch challenge · 14 questions · Version PG-1PZJDR2-1PYH

Free printable
1.5 + 15 =
2.9 + 4 =
3.13 + 7 =
4.8 + 12 =
5.1 + 13 =
6.11 + 9 =
7.6 + 12 =
8.4 + 12 =
9.4 + 11 =
10.2 + 14 =
11.15 + 5 =
12.6 + 6 =
13.6 + 1 =
14.17 + 3 =
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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 9
  1. 5 + 15 =20
  2. 9 + 4 =13
  3. 13 + 7 =20
  4. 8 + 12 =20
  5. 1 + 13 =14
  6. 11 + 9 =20
  7. 6 + 12 =18
  8. 4 + 12 =16
  9. 4 + 11 =15
  10. 2 + 14 =16
  11. 15 + 5 =20
  12. 6 + 6 =12
  13. 6 + 1 =7
  14. 17 + 3 =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.