4 Digit Addition With Regrouping Worksheets - Free Printable

Let's solve each addition problem step by step. We'll add the numbers column by column, starting from the rightmost digit (ones place), carrying over when necessary.

---

Row 1:

1. 5521 + 7780
```
5521
+7780
-----
13301
```
- 1 + 0 = 1
- 2 + 8 = 10 → write 0, carry 1
- 5 + 7 + 1 = 13 → write 3, carry 1
- 5 + 7 + 1 = 13 → write 13
→ 13301

2. 9725 + 3130
```
9725
+3130
-----
12855
```
- 5 + 0 = 5
- 2 + 3 = 5
- 7 + 1 = 8
- 9 + 3 = 12
→ 12855

3. 2269 + 6484
```
2269
+6484
-----
8753
```
- 9 + 4 = 13 → write 3, carry 1
- 6 + 8 + 1 = 15 → write 5, carry 1
- 2 + 4 + 1 = 7
- 2 + 6 = 8
→ 8753

4. 1873 + 7798
```
1873
+7798
-----
9671
```
- 3 + 8 = 11 → write 1, carry 1
- 7 + 9 + 1 = 17 → write 7, carry 1
- 8 + 7 + 1 = 16 → write 6, carry 1
- 1 + 7 + 1 = 9
→ 9671

5. 5642 + 9161
```
5642
+9161
-----
14803
```
- 2 + 1 = 3
- 4 + 6 = 10 → write 0, carry 1
- 6 + 1 + 1 = 8
- 5 + 9 = 14
→ 14803

---

Row 2:

6. 6708 + 5961
```
6708
+5961
-----
12669
```
- 8 + 1 = 9
- 0 + 6 = 6
- 7 + 9 = 16 → write 6, carry 1
- 6 + 5 + 1 = 12
→ 12669

7. 8402 + 8204
```
8402
+8204
-----
16606
```
- 2 + 4 = 6
- 0 + 0 = 0
- 4 + 2 = 6
- 8 + 8 = 16
→ 16606

8. 9045 + 1585
```
9045
+1585
-----
10630
```
- 5 + 5 = 10 → write 0, carry 1
- 4 + 8 + 1 = 13 → write 3, carry 1
- 0 + 5 + 1 = 6
- 9 + 1 = 10
→ 10630

9. 9171 + 9764
```
9171
+9764
-----
18935
```
- 1 + 4 = 5
- 7 + 6 = 13 → write 3, carry 1
- 1 + 7 + 1 = 9
- 9 + 9 = 18
→ 18935

10. 6843 + 2746
```
6843
+2746
-----
9589
```
- 3 + 6 = 9
- 4 + 4 = 8
- 8 + 7 = 15 → write 5, carry 1
- 6 + 2 + 1 = 9
→ 9589

---

Row 3:

11. 2455 + 9686
```
2455
+9686
-----
12141
```
- 5 + 6 = 11 → write 1, carry 1
- 5 + 8 + 1 = 14 → write 4, carry 1
- 4 + 6 + 1 = 11 → write 1, carry 1
- 2 + 9 + 1 = 12
→ 12141

12. 9330 + 6119
```
9330
+6119
-----
15449
```
- 0 + 9 = 9
- 3 + 1 = 4
- 3 + 1 = 4
- 9 + 6 = 15
→ 15449

13. 5612 + 6082
```
5612
+6082
-----
11694
```
- 2 + 2 = 4
- 1 + 8 = 9
- 6 + 0 = 6
- 5 + 6 = 11
→ 11694

14. 2947 + 3770
```
2947
+3770
-----
6717
```
- 7 + 0 = 7
- 4 + 7 = 11 → write 1, carry 1
- 9 + 7 + 1 = 17 → write 7, carry 1
- 2 + 3 + 1 = 6
→ 6717

15. 3016 + 3435
```
3016
+3435
-----
6451
```
- 6 + 5 = 11 → write 1, carry 1
- 1 + 3 + 1 = 5
- 0 + 4 = 4
- 3 + 3 = 6
→ 6451

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✔ Final Answers:

Here are all the solutions:

1. 5521 + 7780 = 13301
2. 9725 + 3130 = 12855
3. 2269 + 6484 = 8753
4. 1873 + 7798 = 9671
5. 5642 + 9161 = 14803
6. 6708 + 5961 = 12669
7. 8402 + 8204 = 16606
8. 9045 + 1585 = 10630
9. 9171 + 9764 = 18935
10. 6843 + 2746 = 9589
11. 2455 + 9686 = 12141
12. 9330 + 6119 = 15449
13. 5612 + 6082 = 11694
14. 2947 + 3770 = 6717
15. 3016 + 3435 = 6451

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✔ All problems solved! Let me know if you'd like this formatted as a printable answer sheet.