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 | thousandths |
| 3 | 8 | 5 | |||||
| - | 8 | 5 | , | 5 | 5 | 6 | |
| , |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| , |
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 (5.00) which becomes (4.99) and get (10).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| , |
Subtract the numbers in the thousandths column from the top number:
10-0-6=4
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| , | 4 |
Subtract the numbers in the hundredths column from the top number:
9-5=4
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| , | 4 | 4 |
Subtract the numbers in the tenths column from the top number:
9-5=4
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| , | 4 | 4 | 4 |
Because the upper digit (4) in the ones 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 (14).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 14 | ||||||
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| , | 4 | 4 | 4 |
Subtract the numbers in the ones column from the top number:
14-5=9
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 14 | ||||||
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| 9 | , | 4 | 4 | 4 |
Because the upper digit (7) in the tens 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 | thousandths |
| 2 | 17 | ||||||
| 7 | 14 | ||||||
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| 9 | , | 4 | 4 | 4 |
Subtract the numbers in the tens column from the top number:
17-8=9
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 17 | ||||||
| 7 | 14 | ||||||
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| 9 | 9 | , | 4 | 4 | 4 |
Write 2 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 17 | ||||||
| 7 | 14 | ||||||
| 4 | 9 | 9 | 10 | ||||
| 3 | 8 | 5 | , | 0 | 0 | 0 | |
| - | 8 | 5 | , | 5 | 5 | 6 | |
| 2 | 9 | 9 | , | 4 | 4 | 4 |
The solution is: 299,444
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