Solution - Long subtraction
3.4
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| 8 | . | 5 | |
| 1 | . | 7 | |
| - | 3 | . | 4 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (5) in the tenths 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 (15).
| Place value | ones | . | tenths |
| 7 | 15 | ||
| 8 | . | 5 | |
| 1 | . | 7 | |
| - | 3 | . | 4 |
| . |
Subtract the numbers in the tenths column from the top number:
15-7-4=4
| Place value | ones | . | tenths |
| 7 | 15 | ||
| 8 | . | 5 | |
| 1 | . | 7 | |
| - | 3 | . | 4 |
| . | 4 |
Subtract the numbers in the ones column from the top number:
7-1-3=3
| Place value | ones | . | tenths |
| 7 | 15 | ||
| 8 | . | 5 | |
| 1 | . | 7 | |
| - | 3 | . | 4 |
| 3 | . | 4 |
The solution is: 3.4
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