Grade 1 · Math · On Level
Free Subtraction Within 20 worksheet - version 4
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-KA0CAT-IB6W
1.
9 - 3 =
2.
17 - 15 =
3.
14 - 14 =
4.
1 - 1 =
5.
20 - 17 =
6.
5 - 4 =
7.
4 - 4 =
8.
17 - 7 =
9.
15 - 1 =
10.
10 - 10 =
11.
6 - 0 =
12.
10 - 9 =
13.
15 - 11 =
14.
11 - 0 =
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 4
- 9 - 3 =6
- 17 - 15 =2
- 14 - 14 =0
- 1 - 1 =0
- 20 - 17 =3
- 5 - 4 =1
- 4 - 4 =0
- 17 - 7 =10
- 15 - 1 =14
- 10 - 10 =0
- 6 - 0 =6
- 10 - 9 =1
- 15 - 11 =4
- 11 - 0 =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.