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 |
| 1 | 2 | , | 8 | |||
| - | 9 | , | 8 | 4 | 4 | |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the thousandths column is too small to get a positive difference, borrow 1 from the number to the left (80) which becomes (79) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 9 | 10 | ||||
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| , |
Subtract the numbers in the thousandths column from the top number:
10-0-4=6
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 9 | 10 | ||||
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| , | 6 |
Subtract the numbers in the hundredths column from the top number:
9-4=5
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 9 | 10 | ||||
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| , | 5 | 6 |
Because the upper digit (7) in the tenths 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 (17).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 17 | |||||
| 7 | 9 | 10 | ||||
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| , | 5 | 6 |
Subtract the numbers in the tenths column from the top number:
17-8=9
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 17 | |||||
| 7 | 9 | 10 | ||||
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| , | 9 | 5 | 6 |
Because the upper digit (1) 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 (11).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 11 | |||||
| 1 | 17 | |||||
| 7 | 9 | 10 | ||||
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| , | 9 | 5 | 6 |
Subtract the numbers in the ones column from the top number:
11-9=2
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 11 | |||||
| 1 | 17 | |||||
| 7 | 9 | 10 | ||||
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| 2 | , | 9 | 5 | 6 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 11 | |||||
| 1 | 17 | |||||
| 7 | 9 | 10 | ||||
| 1 | 2 | , | 8 | 0 | 0 | |
| - | 9 | , | 8 | 4 | 4 | |
| 0 | 2 | , | 9 | 5 | 6 |
The solution is: 2,956
Come ci siamo comportati?
Lasciaci un feedbackPerché imparare questo
Why learn this