Soluzione - Long subtraction
23,21
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 | , | 7 | 9 | ||
| - | 1 | 9 | |||
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 8 | , | 0 | 0 | |
| 5 | , | 7 | 9 | ||
| - | 1 | 9 | , | 0 | 0 |
| , |
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 (8.0) which becomes (7.9) and get (10).
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | 10 | |||
| 4 | 8 | , | 0 | 0 | |
| 5 | , | 7 | 9 | ||
| - | 1 | 9 | , | 0 | 0 |
| , |
Subtract the numbers in the hundredths column from the top number:
10-0-9-0=1
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | 10 | |||
| 4 | 8 | , | 0 | 0 | |
| 5 | , | 7 | 9 | ||
| - | 1 | 9 | , | 0 | 0 |
| , | 1 |
Subtract the numbers in the tenths column from the top number:
9-7-0=2
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | 10 | |||
| 4 | 8 | , | 0 | 0 | |
| 5 | , | 7 | 9 | ||
| - | 1 | 9 | , | 0 | 0 |
| , | 2 | 1 |
Because the upper digit (7) in the ones 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 (17).
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 17 | ||||
| 7 | 9 | 10 | |||
| 4 | 8 | , | 0 | 0 | |
| 5 | , | 7 | 9 | ||
| - | 1 | 9 | , | 0 | 0 |
| , | 2 | 1 |
Subtract the numbers in the ones column from the top number:
17-5-9=3
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 17 | ||||
| 7 | 9 | 10 | |||
| 4 | 8 | , | 0 | 0 | |
| 5 | , | 7 | 9 | ||
| - | 1 | 9 | , | 0 | 0 |
| 3 | , | 2 | 1 |
Subtract the numbers in the tens column from the top number:
3-1=2
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 17 | ||||
| 7 | 9 | 10 | |||
| 4 | 8 | , | 0 | 0 | |
| 5 | , | 7 | 9 | ||
| - | 1 | 9 | , | 0 | 0 |
| 2 | 3 | , | 2 | 1 |
The solution is: 23,21
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