Solution - Long subtraction
7
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 2 | 5 | |
| - | 1 | 8 |
2. Subtract the numbers using long subtraction method
Because the upper digit (5) in the ones 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 (15).
| Place value | tens | ones |
| 1 | 15 | |
| 2 | 5 | |
| - | 1 | 8 |
Subtract the numbers in the ones column from the top number:
15-8=7
| Place value | tens | ones |
| 1 | 15 | |
| 2 | 5 | |
| - | 1 | 8 |
| 7 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | tens | ones |
| 1 | 15 | |
| 2 | 5 | |
| - | 1 | 8 |
| 0 | 7 |
The solution is: 7
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