Free Addition Worksheets - With Regrouping - Free Worksheets ... - Free Printable

Let's solve each of the addition problems in the worksheet step by step. These are all three-digit addition problems that may require regrouping (carrying).

---

Problem 1:

```
233
+ 258
------
```

Step-by-step:

- Ones place: 3 + 8 = 11 → write down 1, carry 1 to tens.
- Tens place: 3 + 5 = 8, plus carried 1 = 9
- Hundreds place: 2 + 2 = 4

✔ Answer: 491

---

Problem 2:

```
125
+ 126
------
```

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

✔ Answer: 251

---

Problem 3:

```
545
+ 428
------
```

- Ones: 5 + 8 = 13 → write 3, carry 1
- Tens: 4 + 2 = 6, plus 1 = 7
- Hundreds: 5 + 4 = 9

✔ Answer: 973

---

Problem 4:

```
254
+ 226
------
```

- Ones: 4 + 6 = 10 → write 0, carry 1
- Tens: 5 + 2 = 7, plus 1 = 8
- Hundreds: 2 + 2 = 4

✔ Answer: 480

---

Problem 5:

```
343
+ 429
------
```

- Ones: 3 + 9 = 12 → write 2, carry 1
- Tens: 4 + 2 = 6, plus 1 = 7
- Hundreds: 3 + 4 = 7

✔ Answer: 772

---

Problem 6:

```
435
+ 255
------
```

- Ones: 5 + 5 = 10 → write 0, carry 1
- Tens: 3 + 5 = 8, plus 1 = 9
- Hundreds: 4 + 2 = 6

✔ Answer: 690

---

Problem 7:

```
434
+ 228
------
```

- Ones: 4 + 8 = 12 → write 2, carry 1
- Tens: 3 + 2 = 5, plus 1 = 6
- Hundreds: 4 + 2 = 6

✔ Answer: 662

---

Problem 8:

```
356
+ 547
------
```

- Ones: 6 + 7 = 13 → write 3, carry 1
- Tens: 5 + 4 = 9, plus 1 = 10 → write 0, carry 1
- Hundreds: 3 + 5 = 8, plus 1 = 9

✔ Answer: 903

---

Problem 9:

```
647
+ 143
------
```

- Ones: 7 + 3 = 10 → write 0, carry 1
- Tens: 4 + 4 = 8, plus 1 = 9
- Hundreds: 6 + 1 = 7

✔ Answer: 790

---

✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 1. 233 + 258 | 491 |
| 2. 125 + 126 | 251 |
| 3. 545 + 428 | 973 |
| 4. 254 + 226 | 480 |
| 5. 343 + 429 | 772 |
| 6. 435 + 255 | 690 |
| 7. 434 + 228 | 662 |
| 8. 356 + 547 | 903 |
| 9. 647 + 143 | 790 |

---

💡 Key Concept:
This worksheet focuses on addition with regrouping (carrying over). Always start from the rightmost digit (ones) and move left, carrying any extra value to the next column.

Let me know if you'd like a printable version or visual explanation!