Solution - Long subtraction
1.8
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| 5 | . | 7 | |
| - | 3 | . | 9 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (7) in the tenths column is too small to get a positive difference, borrow 1 from the digit (5) in the next number place which becomes (4) and get (17).
| Place value | ones | . | tenths |
| 4 | 17 | ||
| 5 | . | 7 | |
| - | 3 | . | 9 |
| . |
Subtract the numbers in the tenths column from the top number:
17-9=8
| Place value | ones | . | tenths |
| 4 | 17 | ||
| 5 | . | 7 | |
| - | 3 | . | 9 |
| . | 8 |
Subtract the numbers in the ones column from the top number:
4-3=1
| Place value | ones | . | tenths |
| 4 | 17 | ||
| 5 | . | 7 | |
| - | 3 | . | 9 |
| 1 | . | 8 |
The solution is: 1.8
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