Solution - Long subtraction
632
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 8 | 4 | 7 | |
| - | 2 | 1 | 5 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
7-5=2
| Place value | hundreds | tens | ones |
| 8 | 4 | 7 | |
| - | 2 | 1 | 5 |
| 2 |
Subtract the numbers in the tens column from the top number:
4-1=3
| Place value | hundreds | tens | ones |
| 8 | 4 | 7 | |
| - | 2 | 1 | 5 |
| 3 | 2 |
Subtract the numbers in the hundreds column from the top number:
8-2=6
| Place value | hundreds | tens | ones |
| 8 | 4 | 7 | |
| - | 2 | 1 | 5 |
| 6 | 3 | 2 |
The solution is: 632
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