Add Two 3-Digit Numbers with Regrouping - Practice Worksheet

Let's solve each of the addition problems on the worksheet step by step. These are 3-digit numbers with regrouping, meaning we will need to carry over values when the sum in a column exceeds 9.

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Problem 1: 203 + 187

```
203
+ 187
-----
```

- Ones place: 3 + 7 = 10 → write down 0, carry 1
- Tens place: 0 + 8 = 8, plus carry 1 = 9 → write down 9
- Hundreds place: 2 + 1 = 3

✔ Answer: 390

---

Problem 2: 185 + 705

```
185
+ 705
-----
```

- Ones: 5 + 5 = 10 → write 0, carry 1
- Tens: 8 + 0 = 8, plus carry 1 = 9 → write 9
- Hundreds: 1 + 7 = 8

✔ Answer: 890

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Problem 3: 534 + 349

```
534
+ 349
-----
```

- Ones: 4 + 9 = 13 → write 3, carry 1
- Tens: 3 + 4 = 7, plus carry 1 = 8 → write 8
- Hundreds: 5 + 3 = 8

✔ Answer: 883

---

Problem 4: 126 + 476

```
126
+ 476
-----
```

- Ones: 6 + 6 = 12 → write 2, carry 1
- Tens: 2 + 7 = 9, plus carry 1 = 10 → write 0, carry 1
- Hundreds: 1 + 4 = 5, plus carry 1 = 6

✔ Answer: 602

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Problem 5: 552 + 257

```
552
+ 257
-----
```

- Ones: 2 + 7 = 9 → write 9
- Tens: 5 + 5 = 10 → write 0, carry 1
- Hundreds: 5 + 2 = 7, plus carry 1 = 8

✔ Answer: 809

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Problem 6: 133 + 257

```
133
+ 257
-----
```

- Ones: 3 + 7 = 10 → write 0, carry 1
- Tens: 3 + 5 = 8, plus carry 1 = 9 → write 9
- Hundreds: 1 + 2 = 3

✔ Answer: 390

---

Problem 7: 414 + 157

```
414
+ 157
-----
```

- Ones: 4 + 7 = 11 → write 1, carry 1
- Tens: 1 + 5 = 6, plus carry 1 = 7 → write 7
- Hundreds: 4 + 1 = 5

✔ Answer: 571

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Problem 8: 451 + 277

```
451
+ 277
-----
```

- Ones: 1 + 7 = 8 → write 8
- Tens: 5 + 7 = 12 → write 2, carry 1
- Hundreds: 4 + 2 = 6, plus carry 1 = 7

✔ Answer: 728

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Problem 9: 296 + 482

```
296
+ 482
-----
```

- Ones: 6 + 2 = 8 → write 8
- Tens: 9 + 8 = 17 → write 7, carry 1
- Hundreds: 2 + 4 = 6, plus carry 1 = 7

✔ Answer: 778

---

Problem 10: 753 + 174

```
753
+ 174
-----
```

- Ones: 3 + 4 = 7 → write 7
- Tens: 5 + 7 = 12 → write 2, carry 1
- Hundreds: 7 + 1 = 8, plus carry 1 = 9

✔ Answer: 927

---

Problem 11: 262 + 341

```
262
+ 341
-----
```

- Ones: 2 + 1 = 3 → write 3
- Tens: 6 + 4 = 10 → write 0, carry 1
- Hundreds: 2 + 3 = 5, plus carry 1 = 6

✔ Answer: 603

---

Problem 12: 273 + 475

```
273
+ 475
-----
```

- Ones: 3 + 5 = 8 → write 8
- Tens: 7 + 7 = 14 → write 4, carry 1
- Hundreds: 2 + 4 = 6, plus carry 1 = 7

✔ Answer: 748

---

Problem 13: 577 + 149

```
577
+ 149
-----
```

- Ones: 7 + 9 = 16 → write 6, carry 1
- Tens: 7 + 4 = 11, plus carry 1 = 12 → write 2, carry 1
- Hundreds: 5 + 1 = 6, plus carry 1 = 7

✔ Answer: 726

---

Problem 14: 748 + 152

```
748
+ 152
-----
```

- Ones: 8 + 2 = 10 → write 0, carry 1
- Tens: 4 + 5 = 9, plus carry 1 = 10 → write 0, carry 1
- Hundreds: 7 + 1 = 8, plus carry 1 = 9

✔ Answer: 900

---

Problem 15: 549 + 379

```
549
+ 379
-----
```

- Ones: 9 + 9 = 18 → write 8, carry 1
- Tens: 4 + 7 = 11, plus carry 1 = 12 → write 2, carry 1
- Hundreds: 5 + 3 = 8, plus carry 1 = 9

✔ Answer: 928

---

Problem 16: 578 + 263

```
578
+ 263
-----
```

- Ones: 8 + 3 = 11 → write 1, carry 1
- Tens: 7 + 6 = 13, plus carry 1 = 14 → write 4, carry 1
- Hundreds: 5 + 2 = 7, plus carry 1 = 8

✔ Answer: 841

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## ✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 1. 203 + 187 | 390 |
| 2. 185 + 705 | 890 |
| 3. 534 + 349 | 883 |
| 4. 126 + 476 | 602 |
| 5. 552 + 257 | 809 |
| 6. 133 + 257 | 390 |
| 7. 414 + 157 | 571 |
| 8. 451 + 277 | 728 |
| 9. 296 + 482 | 778 |
| 10. 753 + 174 | 927 |
| 11. 262 + 341 | 603 |
| 12. 273 + 475 | 748 |
| 13. 577 + 149 | 726 |
| 14. 748 + 152 | 900 |
| 15. 549 + 379 | 928 |
| 16. 578 + 263 | 841 |

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