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Answer:
To determine if the addition problems require regrouping (carrying), we need to add the numbers and see if any column sums to a value greater than 9. If any column's sum exceeds 9, we need to regroup.
1. **456 + 278 + 341**
- Units: 6 + 8 + 1 = 15 (Regroup needed)
- Tens: 5 + 7 + 4 = 16 (Regroup needed)
- Hundreds: 4 + 2 + 3 = 9 (No regrouping needed)
- **Regroup**
2. **789 + 123 + 366**
- Units: 9 + 3 + 6 = 18 (Regroup needed)
- Tens: 8 + 2 + 6 = 16 (Regroup needed)
- Hundreds: 7 + 1 + 3 = 11 (Regroup needed)
- **Regroup**
3. **523 + 287 + 491**
- Units: 3 + 7 + 1 = 11 (Regroup needed)
- Tens: 2 + 8 + 9 = 19 (Regroup needed)
- Hundreds: 5 + 2 + 4 = 11 (Regroup needed)
- **Regroup**
So, the answers to write on your drill board are:
1. Regroup
2. Regroup
3. Regroup