Solution - Long subtraction
9
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 1 | 7 | |
| - | 8 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (7) in the ones 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 | tens | ones |
| 0 | 17 | |
| 1 | 7 | |
| - | 8 | |
Subtract the numbers in the ones column from the top number:
17-8=9
| Place value | tens | ones |
| 0 | 17 | |
| 1 | 7 | |
| - | 8 | |
| 9 |
Write 0 in the tens place.
| Place value | tens | ones |
| 0 | 17 | |
| 1 | 7 | |
| - | 8 | |
| 0 | 9 |
The solution is: 9
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