Soluzione - Long subtraction
90,54
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 9 | 9 | , | 4 | 4 | |
| - | 8 | , | 9 | ||
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 9 | 9 | , | 4 | 4 | |
| - | 8 | , | 9 | 0 | |
| , |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
4-0=4
| Place value | tens | ones | . | tenths | hundredths |
| 9 | 9 | , | 4 | 4 | |
| - | 8 | , | 9 | 0 | |
| , | 4 |
Because the upper digit (4) in the tenths column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (14).
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 14 | ||||
| 9 | 9 | , | 4 | 4 | |
| - | 8 | , | 9 | 0 | |
| , | 4 |
Subtract the numbers in the tenths column from the top number:
14-9=5
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 14 | ||||
| 9 | 9 | , | 4 | 4 | |
| - | 8 | , | 9 | 0 | |
| , | 5 | 4 |
Subtract the numbers in the ones column from the top number:
8-8=0
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 14 | ||||
| 9 | 9 | , | 4 | 4 | |
| - | 8 | , | 9 | 0 | |
| 0 | , | 5 | 4 |
Write 9 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 14 | ||||
| 9 | 9 | , | 4 | 4 | |
| - | 8 | , | 9 | 0 | |
| 9 | 0 | , | 5 | 4 |
The solution is: 90,54
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