Soluzione - Long subtraction
19,17
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 7 | , | 4 | 5 | |
| - | 8 | , | 2 | 8 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (5) in the hundredths column is too small to get a positive difference, borrow 1 from the digit (4) in the next number place which becomes (3) and get (15).
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 15 | ||||
| 2 | 7 | , | 4 | 5 | |
| - | 8 | , | 2 | 8 | |
| , |
Subtract the numbers in the hundredths column from the top number:
15-8=7
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 15 | ||||
| 2 | 7 | , | 4 | 5 | |
| - | 8 | , | 2 | 8 | |
| , | 7 |
Subtract the numbers in the tenths column from the top number:
3-2=1
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 15 | ||||
| 2 | 7 | , | 4 | 5 | |
| - | 8 | , | 2 | 8 | |
| , | 1 | 7 |
Because the upper digit (7) in the ones column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (17).
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 17 | ||||
| 3 | 15 | ||||
| 2 | 7 | , | 4 | 5 | |
| - | 8 | , | 2 | 8 | |
| , | 1 | 7 |
Subtract the numbers in the ones column from the top number:
17-8=9
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 17 | ||||
| 3 | 15 | ||||
| 2 | 7 | , | 4 | 5 | |
| - | 8 | , | 2 | 8 | |
| 9 | , | 1 | 7 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 17 | ||||
| 3 | 15 | ||||
| 2 | 7 | , | 4 | 5 | |
| - | 8 | , | 2 | 8 | |
| 1 | 9 | , | 1 | 7 |
The solution is: 19,17
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