Soluzione - Long subtraction
28,9
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 7 | 5 | , | 2 | |
| - | 4 | 6 | , | 3 |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (2) in the tenths column is too small to get a positive difference, borrow 1 from the digit (5) in the next number place which becomes (4) and get (12).
| Place value | tens | ones | . | tenths |
| 4 | 12 | |||
| 7 | 5 | , | 2 | |
| - | 4 | 6 | , | 3 |
| , |
Subtract the numbers in the tenths column from the top number:
12-3=9
| Place value | tens | ones | . | tenths |
| 4 | 12 | |||
| 7 | 5 | , | 2 | |
| - | 4 | 6 | , | 3 |
| , | 9 |
Because the upper digit (4) in the ones 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 (14).
| Place value | tens | ones | . | tenths |
| 6 | 14 | |||
| 4 | 12 | |||
| 7 | 5 | , | 2 | |
| - | 4 | 6 | , | 3 |
| , | 9 |
Subtract the numbers in the ones column from the top number:
14-6=8
| Place value | tens | ones | . | tenths |
| 6 | 14 | |||
| 4 | 12 | |||
| 7 | 5 | , | 2 | |
| - | 4 | 6 | , | 3 |
| 8 | , | 9 |
Subtract the numbers in the tens column from the top number:
6-4=2
| Place value | tens | ones | . | tenths |
| 6 | 14 | |||
| 4 | 12 | |||
| 7 | 5 | , | 2 | |
| - | 4 | 6 | , | 3 |
| 2 | 8 | , | 9 |
The solution is: 28,9
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