Soluzione - Long subtraction
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 9 | 2 | 1 | 8 | , | 9 | 8 | ||
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| , |
Put zeros in the blank number places:
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| , |
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 digit (8) in the next number place which becomes (7) and get (10).
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| , |
Subtract the numbers in the thousandths column from the top number:
10-0-1=9
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| , | 9 |
Subtract the numbers in the hundredths column from the top number:
7-2=5
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| , | 5 | 9 |
Subtract the numbers in the tenths column from the top number:
9-6=3
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| , | 3 | 5 | 9 |
Subtract the numbers in the ones column from the top number:
8-8=0
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| 0 | , | 3 | 5 | 9 |
Because the upper digit (1) in the tens 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 (11).
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 11 | |||||||
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| 0 | , | 3 | 5 | 9 |
Subtract the numbers in the tens column from the top number:
11-7=4
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 11 | |||||||
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| 4 | 0 | , | 3 | 5 | 9 |
Subtract the numbers in the hundreds column from the top number:
1-1=0
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 11 | |||||||
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| 0 | 4 | 0 | , | 3 | 5 | 9 |
Write 9 in the thousands place.
| Place value | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 11 | |||||||
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | , | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | , | 6 | 2 | 1 | |
| 9 | 0 | 4 | 0 | , | 3 | 5 | 9 |
The solution is: 9040,359
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