Soluzione - Long subtraction
23,121
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 8 | , | 9 | |||
| - | 5 | 5 | , | 7 | 7 | 9 |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 8 | , | 9 | 0 | 0 | |
| - | 5 | 5 | , | 7 | 7 | 9 |
| , |
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 (90) which becomes (89) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | ||||
| 7 | 8 | , | 9 | 0 | 0 | |
| - | 5 | 5 | , | 7 | 7 | 9 |
| , |
Subtract the numbers in the thousandths column from the top number:
10-0-9=1
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | ||||
| 7 | 8 | , | 9 | 0 | 0 | |
| - | 5 | 5 | , | 7 | 7 | 9 |
| , | 1 |
Subtract the numbers in the hundredths column from the top number:
9-7=2
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | ||||
| 7 | 8 | , | 9 | 0 | 0 | |
| - | 5 | 5 | , | 7 | 7 | 9 |
| , | 2 | 1 |
Subtract the numbers in the tenths column from the top number:
8-7=1
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | ||||
| 7 | 8 | , | 9 | 0 | 0 | |
| - | 5 | 5 | , | 7 | 7 | 9 |
| , | 1 | 2 | 1 |
Subtract the numbers in the ones column from the top number:
8-5=3
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | ||||
| 7 | 8 | , | 9 | 0 | 0 | |
| - | 5 | 5 | , | 7 | 7 | 9 |
| 3 | , | 1 | 2 | 1 |
Subtract the numbers in the tens column from the top number:
7-5=2
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | ||||
| 7 | 8 | , | 9 | 0 | 0 | |
| - | 5 | 5 | , | 7 | 7 | 9 |
| 2 | 3 | , | 1 | 2 | 1 |
The solution is: 23,121
Come ci siamo comportati?
Lasciaci un feedbackPerché imparare questo
Why learn this