Let's solve each of the 2-digit subtraction problems with regrouping, step by step. We'll follow the standard subtraction method, borrowing when necessary.
---
1) 33 - 15
```
33
- 15
----
```
- Ones place: 3 < 5 → borrow from tens.
- Borrow 1 from the 3 (tens), so 3 becomes 2, and the ones become 13.
- 13 - 5 = 8
- Tens: 2 - 1 = 1
✔ Answer: 18
---
2) 32 - 14
```
32
- 14
----
```
- Ones: 2 < 4 → borrow from tens.
- 3 becomes 2, 2 becomes 12.
- 12 - 4 = 8
- Tens: 2 - 1 = 1
✔ Answer: 18
---
3) 24 - 15
```
24
- 15
----
```
- Ones: 4 < 5 → borrow from tens.
- 2 becomes 1, 4 becomes 14.
- 14 - 5 = 9
- Tens: 1 - 1 = 0
✔ Answer: 9
---
4) 20 - 13
```
20
- 13
----
```
- Ones: 0 < 3 → borrow from tens.
- 2 becomes 1, 0 becomes 10.
- 10 - 3 = 7
- Tens: 1 - 1 = 0
✔ Answer: 7
---
5) 33 - 15
```
33
- 15
----
```
- Ones: 3 < 5 → borrow.
- 3 becomes 2, 3 becomes 13.
- 13 - 5 = 8
- Tens: 2 - 1 = 1
✔ Answer: 18
---
6) 43 - 26
```
43
- 26
----
```
- Ones: 3 < 6 → borrow.
- 4 becomes 3, 3 becomes 13.
- 13 - 6 = 7
- Tens: 3 - 2 = 1
✔ Answer: 17
---
7) 42 - 25
```
42
- 25
----
```
- Ones: 2 < 5 → borrow.
- 4 becomes 3, 2 becomes 12.
- 12 - 5 = 7
- Tens: 3 - 2 = 1
✔ Answer: 17
---
8) 36 - 18
```
36
- 18
----
```
- Ones: 6 < 8 → borrow.
- 3 becomes 2, 6 becomes 16.
- 16 - 8 = 8
- Tens: 2 - 1 = 1
✔ Answer: 18
---
9) 52 - 15
```
52
- 15
----
```
- Ones: 2 < 5 → borrow.
- 5 becomes 4, 2 becomes 12.
- 12 - 5 = 7
- Tens: 4 - 1 = 3
✔ Answer: 37
---
10) 40 - 24
```
40
- 24
----
```
- Ones: 0 < 4 → borrow.
- 4 becomes 3, 0 becomes 10.
- 10 - 4 = 6
- Tens: 3 - 2 = 1
✔ Answer: 16
---
11) 53 - 17
```
53
- 17
----
```
- Ones: 3 < 7 → borrow.
- 5 becomes 4, 3 becomes 13.
- 13 - 7 = 6
- Tens: 4 - 1 = 3
✔ Answer: 36
---
12) 46 - 29
```
46
- 29
----
```
- Ones: 6 < 9 → borrow.
- 4 becomes 3, 6 becomes 16.
- 16 - 9 = 7
- Tens: 3 - 2 = 1
✔ Answer: 17
---
Now let’s list all the answers:
| Problem | Answer |
|--------|--------|
| 1) | 18 |
| 2) | 18 |
| 3) | 9 |
| 4) | 7 |
| 5) | 18 |
| 6) | 17 |
| 7) | 17 |
| 8) | 18 |
| 9) | 37 |
| 10) | 16 |
| 11) | 36 |
| 12) | 17 |
---
Which one has the smallest difference?
We look for the
smallest answer among these.
The differences are:
- 18, 18, 9,
7, 18, 17, 17, 18, 37, 16, 36, 17
The
smallest is
7, which is from problem
#4: 20 - 13 = 7
✔ Answer: Problem #4 has the smallest difference.
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✔ Final Answer:
Problem 4 (20 - 13) has the smallest difference.
Parent Tip: Review the logic above to help your child master the concept of subtraction with regrouping easy worksheet.
