Soluzione - Long subtraction
228,6
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths |
| 8 | 7 | 1 | |||
| - | 6 | 4 | 2 | , | 4 |
| , |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths |
| 8 | 7 | 1 | , | 0 | |
| - | 6 | 4 | 2 | , | 4 |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the tenths 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 (10).
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 10 | ||||
| 8 | 7 | 1 | , | 0 | |
| - | 6 | 4 | 2 | , | 4 |
| , |
Subtract the numbers in the tenths column from the top number:
10-0-4=6
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 10 | ||||
| 8 | 7 | 1 | , | 0 | |
| - | 6 | 4 | 2 | , | 4 |
| , | 6 |
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (10).
| Place value | hundreds | tens | ones | . | tenths |
| 6 | 10 | ||||
| 0 | 10 | ||||
| 8 | 7 | 1 | , | 0 | |
| - | 6 | 4 | 2 | , | 4 |
| , | 6 |
Subtract the numbers in the ones column from the top number:
10-2=8
| Place value | hundreds | tens | ones | . | tenths |
| 6 | 10 | ||||
| 0 | 10 | ||||
| 8 | 7 | 1 | , | 0 | |
| - | 6 | 4 | 2 | , | 4 |
| 8 | , | 6 |
Subtract the numbers in the tens column from the top number:
6-4=2
| Place value | hundreds | tens | ones | . | tenths |
| 6 | 10 | ||||
| 0 | 10 | ||||
| 8 | 7 | 1 | , | 0 | |
| - | 6 | 4 | 2 | , | 4 |
| 2 | 8 | , | 6 |
Subtract the numbers in the hundreds column from the top number:
8-6=2
| Place value | hundreds | tens | ones | . | tenths |
| 6 | 10 | ||||
| 0 | 10 | ||||
| 8 | 7 | 1 | , | 0 | |
| - | 6 | 4 | 2 | , | 4 |
| 2 | 2 | 8 | , | 6 |
The solution is: 228,6
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