Soluzione - Long subtraction
1,09
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths |
| 8 | , | 9 | ||
| - | 7 | , | 8 | 1 |
| , |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths |
| 8 | , | 9 | 0 | |
| - | 7 | , | 8 | 1 |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the hundredths column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (10).
| Place value | ones | . | tenths | hundredths |
| 8 | 10 | |||
| 8 | , | 9 | 0 | |
| - | 7 | , | 8 | 1 |
| , |
Subtract the numbers in the hundredths column from the top number:
10-0-1=9
| Place value | ones | . | tenths | hundredths |
| 8 | 10 | |||
| 8 | , | 9 | 0 | |
| - | 7 | , | 8 | 1 |
| , | 9 |
Subtract the numbers in the tenths column from the top number:
8-8=0
| Place value | ones | . | tenths | hundredths |
| 8 | 10 | |||
| 8 | , | 9 | 0 | |
| - | 7 | , | 8 | 1 |
| , | 0 | 9 |
Subtract the numbers in the ones column from the top number:
8-7=1
| Place value | ones | . | tenths | hundredths |
| 8 | 10 | |||
| 8 | , | 9 | 0 | |
| - | 7 | , | 8 | 1 |
| 1 | , | 0 | 9 |
The solution is: 1,09
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