Solution - Long subtraction
651
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 6 | 8 | 5 | |
| - | 3 | 4 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
5-4=1
| Place value | hundreds | tens | ones |
| 6 | 8 | 5 | |
| - | 3 | 4 | |
| 1 |
Subtract the numbers in the tens column from the top number:
8-3=5
| Place value | hundreds | tens | ones |
| 6 | 8 | 5 | |
| - | 3 | 4 | |
| 5 | 1 |
Write 6 in the hundreds place.
| Place value | hundreds | tens | ones |
| 6 | 8 | 5 | |
| - | 3 | 4 | |
| 6 | 5 | 1 |
The solution is: 651
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