Grade 1 · Math · On Level
Free Subtraction Within 20 worksheet - version 9
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-L3Z5DQ-IB6W
1.
5 - 5 =
2.
19 - 3 =
3.
2 - 2 =
4.
1 - 1 =
5.
10 - 0 =
6.
12 - 2 =
7.
1 - 0 =
8.
10 - 7 =
9.
4 - 1 =
10.
13 - 4 =
11.
16 - 8 =
12.
9 - 6 =
13.
10 - 4 =
14.
15 - 13 =
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 9
- 5 - 5 =0
- 19 - 3 =16
- 2 - 2 =0
- 1 - 1 =0
- 10 - 0 =10
- 12 - 2 =10
- 1 - 0 =1
- 10 - 7 =3
- 4 - 1 =3
- 13 - 4 =9
- 16 - 8 =8
- 9 - 6 =3
- 10 - 4 =6
- 15 - 13 =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.