Grade 1 · Math · Challenge
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 · Stretch challenge · 14 questions · Version PG-18DTLCU-EJCW
1.
19 - 3 =
2.
8 - 2 =
3.
2 - 2 =
4.
17 - 14 =
5.
20 - 7 =
6.
9 - 8 =
7.
9 - 1 =
8.
3 - 1 =
9.
2 - 1 =
10.
4 - 1 =
11.
4 - 3 =
12.
2 - 0 =
13.
5 - 0 =
14.
15 - 11 =
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
- 19 - 3 =16
- 8 - 2 =6
- 2 - 2 =0
- 17 - 14 =3
- 20 - 7 =13
- 9 - 8 =1
- 9 - 1 =8
- 3 - 1 =2
- 2 - 1 =1
- 4 - 1 =3
- 4 - 3 =1
- 2 - 0 =2
- 5 - 0 =5
- 15 - 11 =4
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.