Soluzione - Long subtraction
40,61
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 8 | , | 5 | 1 | |
| - | 7 | , | 9 | ||
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 8 | , | 5 | 1 | |
| - | 7 | , | 9 | 0 | |
| , |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
1-0=1
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 8 | , | 5 | 1 | |
| - | 7 | , | 9 | 0 | |
| , | 1 |
Because the upper digit (5) in the tenths 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 (15).
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 15 | ||||
| 4 | 8 | , | 5 | 1 | |
| - | 7 | , | 9 | 0 | |
| , | 1 |
Subtract the numbers in the tenths column from the top number:
15-9=6
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 15 | ||||
| 4 | 8 | , | 5 | 1 | |
| - | 7 | , | 9 | 0 | |
| , | 6 | 1 |
Subtract the numbers in the ones column from the top number:
7-7=0
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 15 | ||||
| 4 | 8 | , | 5 | 1 | |
| - | 7 | , | 9 | 0 | |
| 0 | , | 6 | 1 |
Write 4 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 15 | ||||
| 4 | 8 | , | 5 | 1 | |
| - | 7 | , | 9 | 0 | |
| 4 | 0 | , | 6 | 1 |
The solution is: 40,61
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