Let's solve each of the 3-digit addition problems with regrouping step by step. We'll add the numbers column by column, starting from the right (ones place), and carry over when necessary.
---
1. 454 + 636
```
454
+ 636
-----
```
- Ones: 4 + 6 = 10 → write 0, carry 1
- Tens: 5 + 3 + 1 = 9
- Hundreds: 4 + 6 = 10 → write 0, carry 1 (but since it's the last digit, we write 10)
→
1090
---
2. 268 + 754
```
268
+ 754
-----
```
- Ones: 8 + 4 = 12 → write 2, carry 1
- Tens: 6 + 5 + 1 = 12 → write 2, carry 1
- Hundreds: 2 + 7 + 1 = 10 → write 0, carry 1
→
1022
---
3. 798 + 536
```
798
+ 536
-----
```
- Ones: 8 + 6 = 14 → write 4, carry 1
- Tens: 9 + 3 + 1 = 13 → write 3, carry 1
- Hundreds: 7 + 5 + 1 = 13 → write 3, carry 1
→
1334
---
4. 367 + 263
```
367
+ 263
-----
```
- Ones: 7 + 3 = 10 → write 0, carry 1
- Tens: 6 + 6 + 1 = 13 → write 3, carry 1
- Hundreds: 3 + 2 + 1 = 6
→
630
---
5. 445 + 372
```
445
+ 372
-----
```
- Ones: 5 + 2 = 7
- Tens: 4 + 7 = 11 → write 1, carry 1
- Hundreds: 4 + 3 + 1 = 8
→
817
---
6. 597 + 395
```
597
+ 395
-----
```
- Ones: 7 + 5 = 12 → write 2, carry 1
- Tens: 9 + 9 + 1 = 19 → write 9, carry 1
- Hundreds: 5 + 3 + 1 = 9
→
992
---
7. 357 + 496
```
357
+ 496
-----
```
- Ones: 7 + 6 = 13 → write 3, carry 1
- Tens: 5 + 9 + 1 = 15 → write 5, carry 1
- Hundreds: 3 + 4 + 1 = 8
→
853
---
8. 538 + 567
```
538
+ 567
-----
```
- Ones: 8 + 7 = 15 → write 5, carry 1
- Tens: 3 + 6 + 1 = 10 → write 0, carry 1
- Hundreds: 5 + 5 + 1 = 11 → write 1, carry 1
→
1105
---
9. 542 + 376
```
542
+ 376
-----
```
- Ones: 2 + 6 = 8
- Tens: 4 + 7 = 11 → write 1, carry 1
- Hundreds: 5 + 3 + 1 = 9
→
918
---
10. 649 + 376
```
649
+ 376
-----
```
- Ones: 9 + 6 = 15 → write 5, carry 1
- Tens: 4 + 7 + 1 = 12 → write 2, carry 1
- Hundreds: 6 + 3 + 1 = 10 → write 0, carry 1
→
1025
---
11. 327 + 465
```
327
+ 465
-----
```
- Ones: 7 + 5 = 12 → write 2, carry 1
- Tens: 2 + 6 + 1 = 9
- Hundreds: 3 + 4 = 7
→
792
---
12. 572 + 386
```
572
+ 386
-----
```
- Ones: 2 + 6 = 8
- Tens: 7 + 8 = 15 → write 5, carry 1
- Hundreds: 5 + 3 + 1 = 9
→
958
---
✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 454 + 636 |
1090 |
| 268 + 754 |
1022 |
| 798 + 536 |
1334 |
| 367 + 263 |
630 |
| 445 + 372 |
817 |
| 597 + 395 |
992 |
| 357 + 496 |
853 |
| 538 + 567 |
1105 |
| 542 + 376 |
918 |
| 649 + 376 |
1025 |
| 327 + 465 |
792 |
| 572 + 386 |
958 |
---
📝 Explanation:
-
Regrouping means carrying over when the sum in a column is 10 or more.
- Always start from the
rightmost digit (ones).
- Add each column and carry any tens to the next column.
- Continue until all columns are added.
Let me know if you'd like this formatted as a printable worksheet!
Parent Tip: Review the logic above to help your child master the concept of printable 3 digit addition worksheet.
