Soluzione - Long subtraction
67
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | 
| 7 | 3 | |
| 1 | ||
| - | 5 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (3) 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 (13).
| Place value | tens | ones | 
| 6 | 13 | |
| 7 | 3 | |
| 1 | ||
| - | 5 | |
Subtract the numbers in the ones column from the top number:
 13-1-5=7
| Place value | tens | ones | 
| 6 | 13 | |
| 7 | 3 | |
| 1 | ||
| - | 5 | |
| 7 | 
Write 6 in the tens place.
| Place value | tens | ones | 
| 6 | 13 | |
| 7 | 3 | |
| 1 | ||
| - | 5 | |
| 6 | 7 | 
The solution is: 67
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