Grade 1 · Math · On Level
Free Subtraction Within 20 worksheet - version 2
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-IM2Q4Z-IB6W
1.
4 - 2 =
2.
20 - 4 =
3.
4 - 1 =
4.
18 - 15 =
5.
7 - 3 =
6.
19 - 3 =
7.
12 - 1 =
8.
15 - 7 =
9.
16 - 6 =
10.
10 - 8 =
11.
1 - 1 =
12.
2 - 1 =
13.
18 - 6 =
14.
7 - 5 =
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 2
- 4 - 2 =2
- 20 - 4 =16
- 4 - 1 =3
- 18 - 15 =3
- 7 - 3 =4
- 19 - 3 =16
- 12 - 1 =11
- 15 - 7 =8
- 16 - 6 =10
- 10 - 8 =2
- 1 - 1 =0
- 2 - 1 =1
- 18 - 6 =12
- 7 - 5 =2
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.