Solution - Long subtraction
59
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 | |
| - | 1 | 2 | 1 |
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 | |
| - | 1 | 2 | 1 |
Subtract the numbers in the ones column from the top number:
10-1=9
| Place value | hundreds | tens | ones |
| 7 | 10 | ||
| 1 | 8 | 0 | |
| - | 1 | 2 | 1 |
| 9 |
Subtract the numbers in the tens column from the top number:
7-2=5
| Place value | hundreds | tens | ones |
| 7 | 10 | ||
| 1 | 8 | 0 | |
| - | 1 | 2 | 1 |
| 5 | 9 |
Subtract the numbers in the hundreds column from the top number:
1-1=0
| Place value | hundreds | tens | ones |
| 7 | 10 | ||
| 1 | 8 | 0 | |
| - | 1 | 2 | 1 |
| 0 | 5 | 9 |
The solution is: 59
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