Grade 1 · Math · On Level
Free Subtraction Within 20 worksheet - version 15
Build subtraction fluency with numbers through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.
Subtraction Within 20
Grade 1 · On-level practice · 14 questions · Version PG-ZO2PPL-IB6W
1.9 - 2 =
2.20 - 0 =
3.17 - 6 =
4.19 - 19 =
5.2 - 1 =
6.7 - 0 =
7.4 - 4 =
8.10 - 2 =
9.14 - 2 =
10.20 - 10 =
11.9 - 8 =
12.1 - 0 =
13.10 - 3 =
14.10 - 1 =
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
- 9 - 2 =7
- 20 - 0 =20
- 17 - 6 =11
- 19 - 19 =0
- 2 - 1 =1
- 7 - 0 =7
- 4 - 4 =0
- 10 - 2 =8
- 14 - 2 =12
- 20 - 10 =10
- 9 - 8 =1
- 1 - 0 =1
- 10 - 3 =7
- 10 - 1 =9
Worked example
16 - 7 = 9. Break 7 into 6 and 1: 16 - 6 - 1 = 9.
Common mistake
Switching the order of the numbers because subtraction is not commutative.
Helpful hint
Count back to 10, then subtract what remains.