Soluzione - Long subtraction
6,85
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 5 | 2 | ||||
| - | 4 | 5 | , | 1 | 5 |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 5 | 2 | , | 0 | 0 | |
| - | 4 | 5 | , | 1 | 5 |
| , |
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 number to the left (2.0) which becomes (1.9) and get (10).
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 9 | 10 | |||
| 5 | 2 | , | 0 | 0 | |
| - | 4 | 5 | , | 1 | 5 |
| , |
Subtract the numbers in the hundredths column from the top number:
10-0-5=5
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 9 | 10 | |||
| 5 | 2 | , | 0 | 0 | |
| - | 4 | 5 | , | 1 | 5 |
| , | 5 |
Subtract the numbers in the tenths column from the top number:
9-1=8
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 9 | 10 | |||
| 5 | 2 | , | 0 | 0 | |
| - | 4 | 5 | , | 1 | 5 |
| , | 8 | 5 |
Because the upper digit (1) in the ones column is too small to get a positive difference, borrow 1 from the digit (5) in the next number place which becomes (4) and get (11).
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 11 | ||||
| 1 | 9 | 10 | |||
| 5 | 2 | , | 0 | 0 | |
| - | 4 | 5 | , | 1 | 5 |
| , | 8 | 5 |
Subtract the numbers in the ones column from the top number:
11-5=6
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 11 | ||||
| 1 | 9 | 10 | |||
| 5 | 2 | , | 0 | 0 | |
| - | 4 | 5 | , | 1 | 5 |
| 6 | , | 8 | 5 |
Subtract the numbers in the tens column from the top number:
4-4=0
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 11 | ||||
| 1 | 9 | 10 | |||
| 5 | 2 | , | 0 | 0 | |
| - | 4 | 5 | , | 1 | 5 |
| 0 | 6 | , | 8 | 5 |
The solution is: 6,85
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