Solution - Long subtraction
815
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 9 | 0 | 1 | |
| - | 8 | 6 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (90) which becomes (89) and get (11).
| Place value | hundreds | tens | ones |
| 8 | 9 | 11 | |
| 9 | 0 | 1 | |
| - | 8 | 6 | |
Subtract the numbers in the ones column from the top number:
11-6=5
| Place value | hundreds | tens | ones |
| 8 | 9 | 11 | |
| 9 | 0 | 1 | |
| - | 8 | 6 | |
| 5 |
Subtract the numbers in the tens column from the top number:
9-8=1
| Place value | hundreds | tens | ones |
| 8 | 9 | 11 | |
| 9 | 0 | 1 | |
| - | 8 | 6 | |
| 1 | 5 |
Write 8 in the hundreds place.
| Place value | hundreds | tens | ones |
| 8 | 9 | 11 | |
| 9 | 0 | 1 | |
| - | 8 | 6 | |
| 8 | 1 | 5 |
The solution is: 815
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