Soluzione - Long subtraction
18,09
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 9 | ||||
| - | 2 | 0 | , | 9 | 1 |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 9 | , | 0 | 0 | |
| - | 2 | 0 | , | 9 | 1 |
| , |
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 (9.0) which becomes (8.9) and get (10).
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 9 | 10 | |||
| 3 | 9 | , | 0 | 0 | |
| - | 2 | 0 | , | 9 | 1 |
| , |
Subtract the numbers in the hundredths column from the top number:
10-0-1=9
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 9 | 10 | |||
| 3 | 9 | , | 0 | 0 | |
| - | 2 | 0 | , | 9 | 1 |
| , | 9 |
Subtract the numbers in the tenths column from the top number:
9-9=0
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 9 | 10 | |||
| 3 | 9 | , | 0 | 0 | |
| - | 2 | 0 | , | 9 | 1 |
| , | 0 | 9 |
Subtract the numbers in the ones column from the top number:
8-0=8
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 9 | 10 | |||
| 3 | 9 | , | 0 | 0 | |
| - | 2 | 0 | , | 9 | 1 |
| 8 | , | 0 | 9 |
Subtract the numbers in the tens column from the top number:
3-2=1
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 9 | 10 | |||
| 3 | 9 | , | 0 | 0 | |
| - | 2 | 0 | , | 9 | 1 |
| 1 | 8 | , | 0 | 9 |
The solution is: 18,09
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