Solution - Long subtraction
10.7
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 5 | . | 7 | |
| 1 | . | 1 | ||
| - | 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 | tens | ones | . | tenths |
| 4 | 17 | |||
| 1 | 5 | . | 7 | |
| 1 | . | 1 | ||
| - | 3 | . | 9 | |
| . |
Subtract the numbers in the tenths column from the top number:
17-1-9=7
| Place value | tens | ones | . | tenths |
| 4 | 17 | |||
| 1 | 5 | . | 7 | |
| 1 | . | 1 | ||
| - | 3 | . | 9 | |
| . | 7 |
Subtract the numbers in the ones column from the top number:
4-1-3=0
| Place value | tens | ones | . | tenths |
| 4 | 17 | |||
| 1 | 5 | . | 7 | |
| 1 | . | 1 | ||
| - | 3 | . | 9 | |
| 0 | . | 7 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 4 | 17 | |||
| 1 | 5 | . | 7 | |
| 1 | . | 1 | ||
| - | 3 | . | 9 | |
| 1 | 0 | . | 7 |
The solution is: 10.7
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