64 − 28
Common Core 2.NBT.B.5
2-digit subtraction with regrouping
Look at the ones first. If the top ones digit is smaller than the bottom one, trade one ten for ten ones. Cross out the tens digit, write one less, and add 10 to the ones. Then subtract.
One worked example
52 − 27
- 2 is smaller than 7, so trade a ten.
- The 5 tens become 4 tens, and the ones become 12.
- 12 − 7 = 5 and 4 − 2 = 2. The difference is 25.
Answer: 25
Fluently subtract within 100 using place value.
Easy
Subtract. Regroup when the ones ask for it.
30 − 29
14 − 6
64 − 56
83 − 58
53 − 37
Answer key
- 36
- 1
- 8
- 8
- 25
- 16
Medium
Subtract. Regroup when the ones ask for it.
83 − 34
32 − 8
25 − 17
30 − 22
10 − 6
74 − 49
34 − 6
41 − 14
21 − 4
Answer key
- 49
- 24
- 8
- 8
- 4
- 25
- 28
- 27
- 17
Hard
Subtract. Regroup when the ones ask for it.
22 − 8
88 − 69
52 − 38
25 − 17
11 − 2
94 − 75
21 − 15
90 − 81
85 − 29
92 − 73
24 − 17
75 − 59
Answer key
- 14
- 19
- 14
- 8
- 9
- 19
- 6
- 9
- 56
- 19
- 7
- 16
Related skills
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