3 − 1
Common Core 1.OA.C.6
Subtraction within 20
Start at the larger number and take away the smaller one. If you know the matching addition fact, you can count up from the smaller number instead.
One worked example
15 − 7
- 7 + ? = 15.
- 7 + 3 = 10, and 5 more makes 15.
- 3 + 5 = 8.
Answer: 8
Subtract within 20.
Easy
Subtract.
4 − 2
10 − 8
10 − 4
5 − 4
9 − 6
Answer key
- 2
- 2
- 2
- 6
- 1
- 3
Medium
Subtract.
8 − 4
4 − 3
17 − 16
9 − 4
20 − 7
9 − 8
16 − 6
20 − 1
12 − 2
Answer key
- 4
- 1
- 1
- 5
- 13
- 1
- 10
- 19
- 10
Hard
Subtract.
5 − 2
2 − 1
15 − 5
17 − 8
6 − 1
11 − 9
11 − 2
13 − 11
5 − 3
17 − 7
7 − 1
14 − 2
Answer key
- 3
- 1
- 10
- 9
- 5
- 2
- 9
- 2
- 2
- 10
- 6
- 12
Related skills
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