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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 11

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-4AHMMT-1PYH

Free printable
1.7 + 2 =
2.8 + 0 =
3.19 + 1 =
4.4 + 7 =
5.9 + 11 =
6.6 + 5 =
7.15 + 5 =
8.2 + 15 =
9.11 + 9 =
10.8 + 10 =
11.1 + 9 =
12.18 + 2 =
13.8 + 8 =
14.2 + 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 11
  1. 7 + 2 =9
  2. 8 + 0 =8
  3. 19 + 1 =20
  4. 4 + 7 =11
  5. 9 + 11 =20
  6. 6 + 5 =11
  7. 15 + 5 =20
  8. 2 + 15 =17
  9. 11 + 9 =20
  10. 8 + 10 =18
  11. 1 + 9 =10
  12. 18 + 2 =20
  13. 8 + 8 =16
  14. 2 + 7 =9

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.