Solution - Long subtraction
75
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 2 | 8 | 7 | |
| - | 2 | 1 | 2 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
7-2=5
| Place value | hundreds | tens | ones |
| 2 | 8 | 7 | |
| - | 2 | 1 | 2 |
| 5 |
Subtract the numbers in the tens column from the top number:
8-1=7
| Place value | hundreds | tens | ones |
| 2 | 8 | 7 | |
| - | 2 | 1 | 2 |
| 7 | 5 |
Subtract the numbers in the hundreds column from the top number:
2-2=0
| Place value | hundreds | tens | ones |
| 2 | 8 | 7 | |
| - | 2 | 1 | 2 |
| 0 | 7 | 5 |
The solution is: 75
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