Solution - Long subtraction
82
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 1 | 8 | 0 | |
| - | 9 | 8 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (10).
| Place value | hundreds | tens | ones |
| 7 | 10 | ||
| 1 | 8 | 0 | |
| - | 9 | 8 | |
Subtract the numbers in the ones column from the top number:
10-8=2
| Place value | hundreds | tens | ones |
| 7 | 10 | ||
| 1 | 8 | 0 | |
| - | 9 | 8 | |
| 2 |
Because the upper digit (7) in the tens column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (17).
| Place value | hundreds | tens | ones |
| 0 | 17 | ||
| 7 | 10 | ||
| 1 | 8 | 0 | |
| - | 9 | 8 | |
| 2 |
Subtract the numbers in the tens column from the top number:
17-9=8
| Place value | hundreds | tens | ones |
| 0 | 17 | ||
| 7 | 10 | ||
| 1 | 8 | 0 | |
| - | 9 | 8 | |
| 8 | 2 |
Write 0 in the hundreds place.
| Place value | hundreds | tens | ones |
| 0 | 17 | ||
| 7 | 10 | ||
| 1 | 8 | 0 | |
| - | 9 | 8 | |
| 0 | 8 | 2 |
The solution is: 82
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