Soluzione - Long subtraction
3,92
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 9 | 8 | , | 0 | 1 | |
| - | 9 | 4 | , | 0 | 9 |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) 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 (11).
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | 11 | |||
| 9 | 8 | , | 0 | 1 | |
| - | 9 | 4 | , | 0 | 9 |
| , |
Subtract the numbers in the hundredths column from the top number:
11-9=2
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | 11 | |||
| 9 | 8 | , | 0 | 1 | |
| - | 9 | 4 | , | 0 | 9 |
| , | 2 |
Subtract the numbers in the tenths column from the top number:
9-0=9
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | 11 | |||
| 9 | 8 | , | 0 | 1 | |
| - | 9 | 4 | , | 0 | 9 |
| , | 9 | 2 |
Subtract the numbers in the ones column from the top number:
7-4=3
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | 11 | |||
| 9 | 8 | , | 0 | 1 | |
| - | 9 | 4 | , | 0 | 9 |
| 3 | , | 9 | 2 |
Subtract the numbers in the tens column from the top number:
9-9=0
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | 11 | |||
| 9 | 8 | , | 0 | 1 | |
| - | 9 | 4 | , | 0 | 9 |
| 0 | 3 | , | 9 | 2 |
The solution is: 3,92
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