Solution - Long subtraction
90
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 2 | 7 | 0 | |
| - | 1 | 8 | 0 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
0-0=0
| Place value | hundreds | tens | ones |
| 2 | 7 | 0 | |
| - | 1 | 8 | 0 |
| 0 |
Because the upper digit (7) in the tens column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (17).
| Place value | hundreds | tens | ones |
| 1 | 17 | ||
| 2 | 7 | 0 | |
| - | 1 | 8 | 0 |
| 0 |
Subtract the numbers in the tens column from the top number:
17-8=9
| Place value | hundreds | tens | ones |
| 1 | 17 | ||
| 2 | 7 | 0 | |
| - | 1 | 8 | 0 |
| 9 | 0 |
Subtract the numbers in the hundreds column from the top number:
1-1=0
| Place value | hundreds | tens | ones |
| 1 | 17 | ||
| 2 | 7 | 0 | |
| - | 1 | 8 | 0 |
| 0 | 9 | 0 |
The solution is: 90
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