Solution - Long subtraction
5.9
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 1 | . | 5 | |
| 1 | . | 7 | ||
| - | 3 | . | 9 | |
| . |
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 2 from the number to the left (11) which becomes (09) and get (25).
| Place value | tens | ones | . | tenths |
| 0 | 25 | |||
| 1 | 1 | . | 5 | |
| 1 | . | 7 | ||
| - | 3 | . | 9 | |
| . |
Subtract the numbers in the tenths column from the top number:
25-7-9=9
| Place value | tens | ones | . | tenths |
| 0 | 25 | |||
| 1 | 1 | . | 5 | |
| 1 | . | 7 | ||
| - | 3 | . | 9 | |
| . | 9 |
Subtract the numbers in the ones column from the top number:
9-1-3=5
| Place value | tens | ones | . | tenths |
| 0 | 25 | |||
| 1 | 1 | . | 5 | |
| 1 | . | 7 | ||
| - | 3 | . | 9 | |
| 5 | . | 9 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths |
| 0 | 25 | |||
| 1 | 1 | . | 5 | |
| 1 | . | 7 | ||
| - | 3 | . | 9 | |
| 0 | 5 | . | 9 |
The solution is: 5.9
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