PencilGo
Sign in

Grade 1 · Math · Building Confidence

Free Addition Within 20 worksheet - version 3

Practice addition facts and strategies with sums through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.

Download free PDF

Addition Within 20

Grade 1 · Building confidence · 14 questions · Version PG-1VV2WPQ-PNVM

Free printable
1.8 + 4 =
2.10 + 4 =
3.4 + 12 =
4.8 + 1 =
5.12 + 8 =
6.14 + 4 =
7.11 + 9 =
8.13 + 7 =
9.20 + 0 =
10.3 + 17 =
11.10 + 10 =
12.14 + 6 =
13.7 + 0 =
14.4 + 1 =
Worksheet PDFAnswer keyCustomize

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 3
  1. 8 + 4 =12
  2. 10 + 4 =14
  3. 4 + 12 =16
  4. 8 + 1 =9
  5. 12 + 8 =20
  6. 14 + 4 =18
  7. 11 + 9 =20
  8. 13 + 7 =20
  9. 20 + 0 =20
  10. 3 + 17 =20
  11. 10 + 10 =20
  12. 14 + 6 =20
  13. 7 + 0 =7
  14. 4 + 1 =5

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.