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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 15

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-36J7UX-1PYH

Free printable
1.5 + 15 =
2.7 + 0 =
3.17 + 0 =
4.5 + 0 =
5.3 + 1 =
6.4 + 2 =
7.12 + 8 =
8.14 + 6 =
9.18 + 2 =
10.9 + 11 =
11.6 + 2 =
12.19 + 1 =
13.20 + 0 =
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 15
  1. 5 + 15 =20
  2. 7 + 0 =7
  3. 17 + 0 =17
  4. 5 + 0 =5
  5. 3 + 1 =4
  6. 4 + 2 =6
  7. 12 + 8 =20
  8. 14 + 6 =20
  9. 18 + 2 =20
  10. 9 + 11 =20
  11. 6 + 2 =8
  12. 19 + 1 =20
  13. 20 + 0 =20
  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.