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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 5

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-1OVKYZ6-1PYH

Free printable
1.10 + 8 =
2.8 + 12 =
3.12 + 8 =
4.3 + 17 =
5.10 + 10 =
6.3 + 14 =
7.9 + 11 =
8.12 + 2 =
9.12 + 0 =
10.2 + 6 =
11.17 + 3 =
12.11 + 9 =
13.1 + 12 =
14.18 + 2 =
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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 5
  1. 10 + 8 =18
  2. 8 + 12 =20
  3. 12 + 8 =20
  4. 3 + 17 =20
  5. 10 + 10 =20
  6. 3 + 14 =17
  7. 9 + 11 =20
  8. 12 + 2 =14
  9. 12 + 0 =12
  10. 2 + 6 =8
  11. 17 + 3 =20
  12. 11 + 9 =20
  13. 1 + 12 =13
  14. 18 + 2 =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.