Solution - Long subtraction
48
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 8 | 7 | |
| - | 3 | 9 |
2. Subtract the numbers using long subtraction method
Because the upper digit (7) in the ones column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (17).
| Place value | tens | ones |
| 7 | 17 | |
| 8 | 7 | |
| - | 3 | 9 |
Subtract the numbers in the ones column from the top number:
17-9=8
| Place value | tens | ones |
| 7 | 17 | |
| 8 | 7 | |
| - | 3 | 9 |
| 8 |
Subtract the numbers in the tens column from the top number:
7-3=4
| Place value | tens | ones |
| 7 | 17 | |
| 8 | 7 | |
| - | 3 | 9 |
| 4 | 8 |
The solution is: 48
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