Column Addition: 402 + 15
Addition with Regrouping Calculator
What is 402 + 15?
Answer
402 + 15 =
417
No regrouping: each column is added on its own
| 4 | 0 | 2 | |
| + | 1 | 5 | |
| 4 | 1 | 7 |
Column by column: 402 + 15
- Ones: 2 + 5 = 7 — write 7.
- Tens: 0 + 1 = 1 — write 1.
- Hundreds: nothing to add — write 4.
402 + 15 = 417
Second check: 417 − 402 = 15
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