Soluzione - Long subtraction
15,9
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 8 | , | 1 | |
| - | 2 | , | 2 | |
| , |
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 1 from the digit (8) in the next number place which becomes (7) and get (11).
| Place value | tens | ones | . | tenths |
| 7 | 11 | |||
| 1 | 8 | , | 1 | |
| - | 2 | , | 2 | |
| , |
Subtract the numbers in the tenths column from the top number:
11-2=9
| Place value | tens | ones | . | tenths |
| 7 | 11 | |||
| 1 | 8 | , | 1 | |
| - | 2 | , | 2 | |
| , | 9 |
Subtract the numbers in the ones column from the top number:
7-2=5
| Place value | tens | ones | . | tenths |
| 7 | 11 | |||
| 1 | 8 | , | 1 | |
| - | 2 | , | 2 | |
| 5 | , | 9 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 7 | 11 | |||
| 1 | 8 | , | 1 | |
| - | 2 | , | 2 | |
| 1 | 5 | , | 9 |
The solution is: 15,9
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