Soluzione - Long subtraction
81,66
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 3 | , | 2 | 6 | |
| - | 1 | , | 6 | ||
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 3 | , | 2 | 6 | |
| - | 1 | , | 6 | 0 | |
| , |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
6-0=6
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 3 | , | 2 | 6 | |
| - | 1 | , | 6 | 0 | |
| , | 6 |
Because the upper digit (2) in the tenths column is too small to get a positive difference, borrow 1 from the digit (3) in the next number place which becomes (2) and get (12).
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 12 | ||||
| 8 | 3 | , | 2 | 6 | |
| - | 1 | , | 6 | 0 | |
| , | 6 |
Subtract the numbers in the tenths column from the top number:
12-6=6
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 12 | ||||
| 8 | 3 | , | 2 | 6 | |
| - | 1 | , | 6 | 0 | |
| , | 6 | 6 |
Subtract the numbers in the ones column from the top number:
2-1=1
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 12 | ||||
| 8 | 3 | , | 2 | 6 | |
| - | 1 | , | 6 | 0 | |
| 1 | , | 6 | 6 |
Write 8 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 12 | ||||
| 8 | 3 | , | 2 | 6 | |
| - | 1 | , | 6 | 0 | |
| 8 | 1 | , | 6 | 6 |
The solution is: 81,66
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