Solution - Long subtraction
0.5
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| 9 | . | 1 | |
| 5 | . | 9 | |
| - | 2 | . | 7 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the tenths column is too small to get a positive difference, borrow 2 from the digit (9) in the next number place which becomes (7) and get (21).
| Place value | ones | . | tenths |
| 7 | 21 | ||
| 9 | . | 1 | |
| 5 | . | 9 | |
| - | 2 | . | 7 |
| . |
Subtract the numbers in the tenths column from the top number:
21-9-7=5
| Place value | ones | . | tenths |
| 7 | 21 | ||
| 9 | . | 1 | |
| 5 | . | 9 | |
| - | 2 | . | 7 |
| . | 5 |
Subtract the numbers in the ones column from the top number:
7-5-2=0
| Place value | ones | . | tenths |
| 7 | 21 | ||
| 9 | . | 1 | |
| 5 | . | 9 | |
| - | 2 | . | 7 |
| 0 | . | 5 |
The solution is: 0.5
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