PencilGo
Sign in

Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 10

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 · Stretch challenge · 14 questions · Version PG-40I0XU-1PYH

Free printable
1.8 + 11 =
2.1 + 1 =
3.15 + 5 =
4.10 + 10 =
5.13 + 3 =
6.14 + 6 =
7.5 + 15 =
8.17 + 3 =
9.2 + 2 =
10.14 + 4 =
11.0 + 1 =
12.14 + 1 =
13.13 + 7 =
14.7 + 9 =
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 10
  1. 8 + 11 =19
  2. 1 + 1 =2
  3. 15 + 5 =20
  4. 10 + 10 =20
  5. 13 + 3 =16
  6. 14 + 6 =20
  7. 5 + 15 =20
  8. 17 + 3 =20
  9. 2 + 2 =4
  10. 14 + 4 =18
  11. 0 + 1 =1
  12. 14 + 1 =15
  13. 13 + 7 =20
  14. 7 + 9 =16

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.