Soluzione - Long subtraction
76,4
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 8 | 1 | , | 4 | |
| - | 5 | |||
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths |
| 8 | 1 | , | 4 | |
| - | 5 | , | 0 | |
| , |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
4-0=4
| Place value | tens | ones | . | tenths |
| 8 | 1 | , | 4 | |
| - | 5 | , | 0 | |
| , | 4 |
Because the upper digit (1) in the ones 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 | |||
| 8 | 1 | , | 4 | |
| - | 5 | , | 0 | |
| , | 4 |
Subtract the numbers in the ones column from the top number:
11-5=6
| Place value | tens | ones | . | tenths |
| 7 | 11 | |||
| 8 | 1 | , | 4 | |
| - | 5 | , | 0 | |
| 6 | , | 4 |
Write 7 in the tens place.
| Place value | tens | ones | . | tenths |
| 7 | 11 | |||
| 8 | 1 | , | 4 | |
| - | 5 | , | 0 | |
| 7 | 6 | , | 4 |
The solution is: 76,4
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