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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 13

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-3QIF8V-1PYH

Free printable
1.13 + 3 =
2.9 + 3 =
3.8 + 10 =
4.15 + 5 =
5.20 + 0 =
6.6 + 7 =
7.18 + 2 =
8.13 + 4 =
9.16 + 4 =
10.14 + 1 =
11.7 + 13 =
12.14 + 6 =
13.1 + 15 =
14.3 + 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 13
  1. 13 + 3 =16
  2. 9 + 3 =12
  3. 8 + 10 =18
  4. 15 + 5 =20
  5. 20 + 0 =20
  6. 6 + 7 =13
  7. 18 + 2 =20
  8. 13 + 4 =17
  9. 16 + 4 =20
  10. 14 + 1 =15
  11. 7 + 13 =20
  12. 14 + 6 =20
  13. 1 + 15 =16
  14. 3 + 7 =10

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.