Solution - Long subtraction
54
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 7 | 3 | |
| - | 1 | 9 |
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 | 9 |
Subtract the numbers in the ones column from the top number:
13-9=4
| Place value | tens | ones |
| 6 | 13 | |
| 7 | 3 | |
| - | 1 | 9 |
| 4 |
Subtract the numbers in the tens column from the top number:
6-1=5
| Place value | tens | ones |
| 6 | 13 | |
| 7 | 3 | |
| - | 1 | 9 |
| 5 | 4 |
The solution is: 54
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