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 |
| 2 | 5 | , | 8 | ||||
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the ten thousandths column is too small to get a positive difference, borrow 1 from the number to the left (800) which becomes (799) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , |
Subtract the numbers in the ten thousandths column from the top number:
10-0-3=7
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , | 7 |
Subtract the numbers in the thousandths column from the top number:
9-0=9
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , | 9 | 7 |
Subtract the numbers in the hundredths column from the top number:
9-3=6
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , | 6 | 9 | 7 |
Because the upper digit (7) in the tenths column is too small to get a positive difference, borrow 1 from the digit (5) in the next number place which becomes (4) and get (17).
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 4 | 17 | ||||||
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , | 6 | 9 | 7 |
Subtract the numbers in the tenths column from the top number:
17-9=8
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 4 | 17 | ||||||
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , | 8 | 6 | 9 | 7 |
Because the upper digit (4) in the ones column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (14).
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 1 | 14 | ||||||
| 4 | 17 | ||||||
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| , | 8 | 6 | 9 | 7 |
Subtract the numbers in the ones column from the top number:
14-8=6
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 1 | 14 | ||||||
| 4 | 17 | ||||||
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| 6 | , | 8 | 6 | 9 | 7 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 1 | 14 | ||||||
| 4 | 17 | ||||||
| 7 | 9 | 9 | 10 | ||||
| 2 | 5 | , | 8 | 0 | 0 | 0 | |
| - | 8 | , | 9 | 3 | 0 | 3 | |
| 1 | 6 | , | 8 | 6 | 9 | 7 |
The solution is: 16,8697
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