Soluzione - Long subtraction
4,78
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 7 | , | 1 | 8 | |
| - | 1 | 2 | , | 4 | |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 7 | , | 1 | 8 | |
| - | 1 | 2 | , | 4 | 0 |
| , |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
8-0=8
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 7 | , | 1 | 8 | |
| - | 1 | 2 | , | 4 | 0 |
| , | 8 |
Because the upper digit (1) in the tenths 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 (11).
| Place value | tens | ones | . | tenths | hundredths |
| 6 | 11 | ||||
| 1 | 7 | , | 1 | 8 | |
| - | 1 | 2 | , | 4 | 0 |
| , | 8 |
Subtract the numbers in the tenths column from the top number:
11-4=7
| Place value | tens | ones | . | tenths | hundredths |
| 6 | 11 | ||||
| 1 | 7 | , | 1 | 8 | |
| - | 1 | 2 | , | 4 | 0 |
| , | 7 | 8 |
Subtract the numbers in the ones column from the top number:
6-2=4
| Place value | tens | ones | . | tenths | hundredths |
| 6 | 11 | ||||
| 1 | 7 | , | 1 | 8 | |
| - | 1 | 2 | , | 4 | 0 |
| 4 | , | 7 | 8 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | tens | ones | . | tenths | hundredths |
| 6 | 11 | ||||
| 1 | 7 | , | 1 | 8 | |
| - | 1 | 2 | , | 4 | 0 |
| 0 | 4 | , | 7 | 8 |
The solution is: 4,78
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