Let's solve each of the
2-digit subtraction problems with regrouping step by step. Regrouping (also known as borrowing) is needed when the bottom digit in a column is larger than the top digit.
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🔹 Problem 1:
21 - 17
- Ones place: 1 - 7 → can't do, so
regroup.
- Borrow 1 from the tens place (2 becomes 1), and add 10 to the ones place (1 becomes 11).
- Now: 11 - 7 =
4
- Tens place: 1 - 1 =
0
-
✔ Answer:
4
---
🔹 Problem 2:
53 - 37
- Ones place: 3 - 7 → can't do, so
regroup.
- Borrow 1 from tens (5 → 4), add 10 to ones (3 → 13)
- 13 - 7 =
6
- Tens: 4 - 3 =
1
-
✔ Answer:
16
---
🔹 Problem 3:
62 - 26
- Ones: 2 - 6 → need to borrow
- Borrow 1 from tens (6 → 5), ones become 12
- 12 - 6 =
6
- Tens: 5 - 2 =
3
-
✔ Answer:
36
---
🔹 Problem 4:
52 - 29
- Ones: 2 - 9 → borrow
- Tens: 5 → 4, ones: 2 → 12
- 12 - 9 =
3
- Tens: 4 - 2 =
2
-
✔ Answer:
23
---
🔹 Problem 5:
71 - 26
- Ones: 1 - 6 → borrow
- Tens: 7 → 6, ones: 1 → 11
- 11 - 6 =
5
- Tens: 6 - 2 =
4
-
✔ Answer:
45
---
🔹 Problem 6:
70 - 15
- Ones: 0 - 5 → borrow
- Tens: 7 → 6, ones: 0 → 10
- 10 - 5 =
5
- Tens: 6 - 1 =
5
-
✔ Answer:
55
---
🔹 Problem 7:
54 - 37
- Ones: 4 - 7 → borrow
- Tens: 5 → 4, ones: 4 → 14
- 14 - 7 =
7
- Tens: 4 - 3 =
1
-
✔ Answer:
17
---
🔹 Problem 8:
42 - 29
- Ones: 2 - 9 → borrow
- Tens: 4 → 3, ones: 2 → 12
- 12 - 9 =
3
- Tens: 3 - 2 =
1
-
✔ Answer:
13
---
🔹 Problem 9:
75 - 49
- Ones: 5 - 9 → borrow
- Tens: 7 → 6, ones: 5 → 15
- 15 - 9 =
6
- Tens: 6 - 4 =
2
-
✔ Answer:
26
---
🔹 Problem 10:
60 - 38
- Ones: 0 - 8 → borrow
- Tens: 6 → 5, ones: 0 → 10
- 10 - 8 =
2
- Tens: 5 - 3 =
2
-
✔ Answer:
22
---
🔹 Problem 11:
53 - 35
- Ones: 3 - 5 → borrow
- Tens: 5 → 4, ones: 3 → 13
- 13 - 5 =
8
- Tens: 4 - 3 =
1
-
✔ Answer:
18
---
🔹 Problem 12:
72 - 27
- Ones: 2 - 7 → borrow
- Tens: 7 → 6, ones: 2 → 12
- 12 - 7 =
5
- Tens: 6 - 2 =
4
-
✔ Answer:
45
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✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 21 - 17 |
4 |
| 53 - 37 |
16 |
| 62 - 26 |
36 |
| 52 - 29 |
23 |
| 71 - 26 |
45 |
| 70 - 15 |
55 |
| 54 - 37 |
17 |
| 42 - 29 |
13 |
| 75 - 49 |
26 |
| 60 - 38 |
22 |
| 53 - 35 |
18 |
| 72 - 27 |
45 |
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📝 Summary:
All problems involve
regrouping, which means borrowing 1 from the tens place to make the ones place large enough to subtract. The key steps are:
1. Check if the bottom digit is larger than the top in the ones place.
2. If yes, borrow 1 from the tens.
3. Subtract both columns.
4. Write the result.
Let me know if you'd like this formatted as a printable answer sheet!
Parent Tip: Review the logic above to help your child master the concept of two digit subtraction regrouping worksheet.
