Grade 1 · Math · On Level
Free Addition Within 20 worksheet - version 12
Practice addition facts and strategies with sums through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.
Addition Within 20
Grade 1 · On-level practice · 14 questions · Version PG-1HJS3SS-L19P
1.2 + 12 =
2.18 + 2 =
3.11 + 8 =
4.20 + 0 =
5.6 + 3 =
6.9 + 11 =
7.5 + 11 =
8.5 + 0 =
9.11 + 9 =
10.5 + 1 =
11.3 + 17 =
12.7 + 13 =
13.18 + 0 =
14.3 + 8 =
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 12
- 2 + 12 =14
- 18 + 2 =20
- 11 + 8 =19
- 20 + 0 =20
- 6 + 3 =9
- 9 + 11 =20
- 5 + 11 =16
- 5 + 0 =5
- 11 + 9 =20
- 5 + 1 =6
- 3 + 17 =20
- 7 + 13 =20
- 18 + 0 =18
- 3 + 8 =11
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.