Soluzione - Long subtraction
12,8
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 7 | , | 7 | |
| 0 | , | 9 | ||
| - | 4 | |||
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths |
| 1 | 7 | , | 7 | |
| 0 | , | 9 | ||
| - | 4 | , | 0 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (7) in the tenths column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (17).
| Place value | tens | ones | . | tenths |
| 6 | 17 | |||
| 1 | 7 | , | 7 | |
| 0 | , | 9 | ||
| - | 4 | , | 0 | |
| , |
Subtract the numbers in the tenths column from the top number:
17-9-0=8
| Place value | tens | ones | . | tenths |
| 6 | 17 | |||
| 1 | 7 | , | 7 | |
| 0 | , | 9 | ||
| - | 4 | , | 0 | |
| , | 8 |
Subtract the numbers in the ones column from the top number:
6-0-4=2
| Place value | tens | ones | . | tenths |
| 6 | 17 | |||
| 1 | 7 | , | 7 | |
| 0 | , | 9 | ||
| - | 4 | , | 0 | |
| 2 | , | 8 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 6 | 17 | |||
| 1 | 7 | , | 7 | |
| 0 | , | 9 | ||
| - | 4 | , | 0 | |
| 1 | 2 | , | 8 |
The solution is: 12,8
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