4-Digit Subtraction Worksheet with Regrouping Problems

Absolutely! Let’s solve all 20 subtraction problems step by step, using regrouping (also known as “borrowing”) where needed. I’ll show the full work for a few examples and then provide answers for all.

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🔢 Key Concept: Regrouping in Subtraction

When a digit in the top number is smaller than the digit below it, you borrow 1 from the next higher place value (to the left), which adds 10 to the current digit.

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## ✔ Solutions with Step-by-Step Work

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Problem 1: 5243 – 2126

```
5243
- 2126
------
```

Start from right:

- Ones: 3 – 6 → can’t do → borrow from tens.
Tens digit is 4 → becomes 3, ones becomes 13.
13 – 6 = 7

- Tens: 3 – 2 = 1

- Hundreds: 2 – 1 = 1

- Thousands: 5 – 2 = 3

✔ Answer: 3117

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Problem 2: 3531 – 1125

```
3531
- 1125
------
```

- Ones: 1 – 5 → borrow → 11 – 5 = 6 (tens becomes 2)

- Tens: 2 – 2 = 0

- Hundreds: 5 – 1 = 4

- Thousands: 3 – 1 = 2

✔ Answer: 2406

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Problem 3: 4257 – 2134

```
4257
- 2134
------
```

No borrowing needed!

- 7 – 4 = 3
- 5 – 3 = 2
- 2 – 1 = 1
- 4 – 2 = 2

✔ Answer: 2123

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Problem 4: 2483 – 1631

```
2483
- 1631
------
```

- Ones: 3 – 1 = 2

- Tens: 8 – 3 = 5

- Hundreds: 4 – 6 → can’t → borrow from thousands.
Thousands: 2 → 1, hundreds: 4 → 14 → 14 – 6 = 8

- Thousands: 1 – 1 = 0

✔ Answer: 852

*(Note: Leading zero not written — so just 852)*

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Problem 5: 7258 – 4636

```
7258
- 4636
------
```

- Ones: 8 – 6 = 2

- Tens: 5 – 3 = 2

- Hundreds: 2 – 6 → borrow → 12 – 6 = 6 (thousands: 7→6)

- Thousands: 6 – 4 = 2

✔ Answer: 2622

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Problem 6: 5733 – 2015

```
5733
- 2015
------
```

- Ones: 3 – 5 → borrow → 13 – 5 = 8 (tens: 3→2)

- Tens: 2 – 1 = 1

- Hundreds: 7 – 0 = 7

- Thousands: 5 – 2 = 3

✔ Answer: 3718

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Problem 7: 8445 – 723

Wait — this is 4-digit minus 3-digit. Align properly:

```
8445
- 723
------
```

Think of it as 0723.

- Ones: 5 – 3 = 2

- Tens: 4 – 2 = 2

- Hundreds: 4 – 7 → borrow → 14 – 7 = 7 (thousands: 8→7)

- Thousands: 7 – 0 = 7

✔ Answer: 7722

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Problem 8: 6508 – 3254

```
6508
- 3254
------
```

- Ones: 8 – 4 = 4

- Tens: 0 – 5 → borrow → 10 – 5 = 5 (hundreds: 5→4)

- Hundreds: 4 – 2 = 2

- Thousands: 6 – 3 = 3

✔ Answer: 3254

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Problem 9: 6358 – 6275

```
6358
- 6275
------
```

- Ones: 8 – 5 = 3

- Tens: 5 – 7 → borrow → 15 – 7 = 8 (hundreds: 3→2)

- Hundreds: 2 – 2 = 0

- Thousands: 6 – 6 = 0

✔ Answer: 83

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Problem 10: 4260 – 2128

```
4260
- 2128
------
```

- Ones: 0 – 8 → borrow → 10 – 8 = 2 (tens: 6→5)

- Tens: 5 – 2 = 3

- Hundreds: 2 – 1 = 1

- Thousands: 4 – 2 = 2

✔ Answer: 2132

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Problem 11: 1165 – 872

Align:

```
1165
- 872
------
```

- Ones: 5 – 2 = 3

- Tens: 6 – 7 → borrow → 16 – 7 = 9 (hundreds: 1→0)

- Hundreds: 0 – 8 → borrow → 10 – 8 = 2 (thousands: 1→0)

- Thousands: 0 – 0 = 0

✔ Answer: 293

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Problem 12: 5354 – 3834

```
5354
- 3834
------
```

- Ones: 4 – 4 = 0

- Tens: 5 – 3 = 2

- Hundreds: 3 – 8 → borrow → 13 – 8 = 5 (thousands: 5→4)

- Thousands: 4 – 3 = 1

✔ Answer: 1520

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Problem 13: 7435 – 2107

```
7435
- 2107
------
```

- Ones: 5 – 7 → borrow → 15 – 7 = 8 (tens: 3→2)

- Tens: 2 – 0 = 2

- Hundreds: 4 – 1 = 3

- Thousands: 7 – 2 = 5

✔ Answer: 5328

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Problem 14: 3537 – 1396

```
3537
- 1396
------
```

- Ones: 7 – 6 = 1

- Tens: 3 – 9 → borrow → 13 – 9 = 4 (hundreds: 5→4)

- Hundreds: 4 – 3 = 1

- Thousands: 3 – 1 = 2

✔ Answer: 2141

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Problem 15: 8659 – 2264

```
8659
- 2264
------
```

- Ones: 9 – 4 = 5

- Tens: 5 – 6 → borrow → 15 – 6 = 9 (hundreds: 6→5)

- Hundreds: 5 – 2 = 3

- Thousands: 8 – 2 = 6

✔ Answer: 6395

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Problem 16: 5268 – 335

Align:

```
5268
- 335
------
```

- Ones: 8 – 5 = 3

- Tens: 6 – 3 = 3

- Hundreds: 2 – 3 → borrow → 12 – 3 = 9 (thousands: 5→4)

- Thousands: 4 – 0 = 4

✔ Answer: 4933

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Problem 17: 4670 – 2255

```
4670
- 2255
------
```

- Ones: 0 – 5 → borrow → 10 – 5 = 5 (tens: 7→6)

- Tens: 6 – 5 = 1

- Hundreds: 6 – 2 = 4

- Thousands: 4 – 2 = 2

✔ Answer: 2415

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Problem 18: 6587 – 847

Align:

```
6587
- 847
------
```

- Ones: 7 – 7 = 0

- Tens: 8 – 4 = 4

- Hundreds: 5 – 8 → borrow → 15 – 8 = 7 (thousands: 6→5)

- Thousands: 5 – 0 = 5

✔ Answer: 5740

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Problem 19: 7457 – 1392

```
7457
- 1392
------
```

- Ones: 7 – 2 = 5

- Tens: 5 – 9 → borrow → 15 – 9 = 6 (hundreds: 4→3)

- Hundreds: 3 – 3 = 0

- Thousands: 7 – 1 = 6

✔ Answer: 6065

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Problem 20: 6758 – 5597

```
6758
- 5597
------
```

- Ones: 8 – 7 = 1

- Tens: 5 – 9 → borrow → 15 – 9 = 6 (hundreds: 7→6)

- Hundreds: 6 – 5 = 1

- Thousands: 6 – 5 = 1

✔ Answer: 1161

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## 📋 Final Answer Key:

| Problem | Answer |
|---------|--------|
| 1 | 3117 |
| 2 | 2406 |
| 3 | 2123 |
| 4 | 852 |
| 5 | 2622 |
| 6 | 3718 |
| 7 | 7722 |
| 8 | 3254 |
| 9 | 83 |
| 10 | 2132 |
| 11 | 293 |
| 12 | 1520 |
| 13 | 5328 |
| 14 | 2141 |
| 15 | 6395 |
| 16 | 4933 |
| 17 | 2415 |
| 18 | 5740 |
| 19 | 6065 |
| 20 | 1161 |

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✔ All problems solved with regrouping where necessary. You can now check your work or use this as an answer key!

Let me know if you’d like to see any problem worked out again with visuals or animations!