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Grade 1 · Math · Building Confidence

Free Addition Within 20 worksheet - version 14

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 · Building confidence · 14 questions · Version PG-1C34CO4-PNVM

Free printable
1.18 + 2 =
2.8 + 1 =
3.16 + 4 =
4.7 + 13 =
5.3 + 3 =
6.4 + 5 =
7.5 + 15 =
8.6 + 9 =
9.19 + 1 =
10.17 + 3 =
11.0 + 0 =
12.5 + 5 =
13.2 + 18 =
14.1 + 19 =
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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 14
  1. 18 + 2 =20
  2. 8 + 1 =9
  3. 16 + 4 =20
  4. 7 + 13 =20
  5. 3 + 3 =6
  6. 4 + 5 =9
  7. 5 + 15 =20
  8. 6 + 9 =15
  9. 19 + 1 =20
  10. 17 + 3 =20
  11. 0 + 0 =0
  12. 5 + 5 =10
  13. 2 + 18 =20
  14. 1 + 19 =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.