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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 6

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-1OLLDA7-1PYH

Free printable
1.17 + 3 =
2.1 + 19 =
3.18 + 2 =
4.7 + 7 =
5.3 + 17 =
6.16 + 4 =
7.1 + 8 =
8.3 + 0 =
9.11 + 9 =
10.20 + 0 =
11.8 + 5 =
12.14 + 1 =
13.0 + 11 =
14.7 + 13 =
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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 6
  1. 17 + 3 =20
  2. 1 + 19 =20
  3. 18 + 2 =20
  4. 7 + 7 =14
  5. 3 + 17 =20
  6. 16 + 4 =20
  7. 1 + 8 =9
  8. 3 + 0 =3
  9. 11 + 9 =20
  10. 20 + 0 =20
  11. 8 + 5 =13
  12. 14 + 1 =15
  13. 0 + 11 =11
  14. 7 + 13 =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.