Solution - Long subtraction
55
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 7 | 1 | |
| 5 | ||
| - | 1 | 1 |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the ones column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (11).
| Place value | tens | ones |
| 6 | 11 | |
| 7 | 1 | |
| 5 | ||
| - | 1 | 1 |
Subtract the numbers in the ones column from the top number:
11-5-1=5
| Place value | tens | ones |
| 6 | 11 | |
| 7 | 1 | |
| 5 | ||
| - | 1 | 1 |
| 5 |
Subtract the numbers in the tens column from the top number:
6-1=5
| Place value | tens | ones |
| 6 | 11 | |
| 7 | 1 | |
| 5 | ||
| - | 1 | 1 |
| 5 | 5 |
The solution is: 55
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