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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 2

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-1NHMYIB-1PYH

Free printable
1.10 + 9 =
2.13 + 7 =
3.0 + 16 =
4.18 + 2 =
5.20 + 0 =
6.3 + 17 =
7.11 + 0 =
8.0 + 0 =
9.5 + 2 =
10.1 + 0 =
11.14 + 6 =
12.12 + 8 =
13.11 + 9 =
14.16 + 4 =
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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 2
  1. 10 + 9 =19
  2. 13 + 7 =20
  3. 0 + 16 =16
  4. 18 + 2 =20
  5. 20 + 0 =20
  6. 3 + 17 =20
  7. 11 + 0 =11
  8. 0 + 0 =0
  9. 5 + 2 =7
  10. 1 + 0 =1
  11. 14 + 6 =20
  12. 12 + 8 =20
  13. 11 + 9 =20
  14. 16 + 4 =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.