Grade 1 · Math · Building Confidence
Free Subtraction Within 20 worksheet - version 8
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 · Building confidence · 14 questions · Version PG-7EL0XF-1PAM
1.7 - 2 =
2.19 - 11 =
3.7 - 3 =
4.5 - 0 =
5.3 - 1 =
6.5 - 2 =
7.6 - 3 =
8.9 - 0 =
9.12 - 7 =
10.2 - 0 =
11.20 - 1 =
12.13 - 7 =
13.20 - 7 =
14.17 - 6 =
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 8
- 7 - 2 =5
- 19 - 11 =8
- 7 - 3 =4
- 5 - 0 =5
- 3 - 1 =2
- 5 - 2 =3
- 6 - 3 =3
- 9 - 0 =9
- 12 - 7 =5
- 2 - 0 =2
- 20 - 1 =19
- 13 - 7 =6
- 20 - 7 =13
- 17 - 6 =11
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.