Soluzione - Long subtraction
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 1 | 8 | |||||||
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the hundred thousandths column is too small to get a positive difference, borrow 1 from the number to the left (8.0000) which becomes (7.9999) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , |
Subtract the numbers in the hundred thousandths column from the top number:
10-0-3=7
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , | 7 |
Subtract the numbers in the ten thousandths column from the top number:
9-2=7
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , | 7 | 7 |
Subtract the numbers in the thousandths column from the top number:
9-9=0
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , | 0 | 7 | 7 |
Subtract the numbers in the hundredths column from the top number:
9-6=3
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , | 3 | 0 | 7 | 7 |
Subtract the numbers in the tenths column from the top number:
9-7=2
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , | 2 | 3 | 0 | 7 | 7 |
Because the upper digit (7) in the ones column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (17).
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 0 | 17 | |||||||
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| , | 2 | 3 | 0 | 7 | 7 |
Subtract the numbers in the ones column from the top number:
17-8=9
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 0 | 17 | |||||||
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| 9 | , | 2 | 3 | 0 | 7 | 7 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| 0 | 17 | |||||||
| 7 | 9 | 9 | 9 | 9 | 10 | |||
| 1 | 8 | , | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | , | 7 | 6 | 9 | 2 | 3 | |
| 0 | 9 | , | 2 | 3 | 0 | 7 | 7 |
The solution is: 9,23077
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