Soluzione - Long subtraction
0,9
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| 2 | , | 8 | |
| - | 1 | , | 9 |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (8) 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 (18).
| Place value | ones | . | tenths |
| 1 | 18 | ||
| 2 | , | 8 | |
| - | 1 | , | 9 |
| , |
Subtract the numbers in the tenths column from the top number:
18-9=9
| Place value | ones | . | tenths |
| 1 | 18 | ||
| 2 | , | 8 | |
| - | 1 | , | 9 |
| , | 9 |
Subtract the numbers in the ones column from the top number:
1-1=0
| Place value | ones | . | tenths |
| 1 | 18 | ||
| 2 | , | 8 | |
| - | 1 | , | 9 |
| 0 | , | 9 |
The solution is: 0,9
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