Soluzione - Long subtraction
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (7) in the hundredths column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (17).
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 7 | 17 | |||||
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| , |
Subtract the numbers in the hundredths column from the top number:
17-8=9
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 7 | 17 | |||||
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| , | 9 |
Because the upper digit (7) in the tenths column is too small to get a positive difference, borrow 1 from the digit (3) in the next number place which becomes (2) and get (17).
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 2 | 17 | |||||
| 7 | 17 | |||||
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| , | 9 |
Subtract the numbers in the tenths column from the top number:
17-9=8
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 2 | 17 | |||||
| 7 | 17 | |||||
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| , | 8 | 9 |
Because the upper digit (2) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (10) which becomes (09) and get (12).
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 0 | 9 | 12 | ||||
| 2 | 17 | |||||
| 7 | 17 | |||||
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| , | 8 | 9 |
Subtract the numbers in the ones column from the top number:
12-4=8
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 0 | 9 | 12 | ||||
| 2 | 17 | |||||
| 7 | 17 | |||||
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| 8 | , | 8 | 9 |
Subtract the numbers in the tens column from the top number:
9-6=3
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 0 | 9 | 12 | ||||
| 2 | 17 | |||||
| 7 | 17 | |||||
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| 3 | 8 | , | 8 | 9 |
Write 0 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 0 | 9 | 12 | ||||
| 2 | 17 | |||||
| 7 | 17 | |||||
| 1 | 0 | 3 | , | 8 | 7 | |
| - | 6 | 4 | , | 9 | 8 | |
| 0 | 3 | 8 | , | 8 | 9 |
The solution is: 38,89
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