Solution - Long subtraction
11.5
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 2 | . | 4 | |
| - | 0 | . | 9 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (4) in the tenths column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (14).
| Place value | tens | ones | . | tenths |
| 1 | 14 | |||
| 1 | 2 | . | 4 | |
| - | 0 | . | 9 | |
| . |
Subtract the numbers in the tenths column from the top number:
14-9=5
| Place value | tens | ones | . | tenths |
| 1 | 14 | |||
| 1 | 2 | . | 4 | |
| - | 0 | . | 9 | |
| . | 5 |
Subtract the numbers in the ones column from the top number:
1-0=1
| Place value | tens | ones | . | tenths |
| 1 | 14 | |||
| 1 | 2 | . | 4 | |
| - | 0 | . | 9 | |
| 1 | . | 5 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 1 | 14 | |||
| 1 | 2 | . | 4 | |
| - | 0 | . | 9 | |
| 1 | 1 | . | 5 |
The solution is: 11.5
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