Soluzione - Long subtraction
4,8
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 2 | |||
| 2 | , | 4 | ||
| - | 4 | , | 8 | |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths |
| 1 | 2 | , | 0 | |
| 2 | , | 4 | ||
| - | 4 | , | 8 | |
| , |
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 2 from the digit (2) in the next number place which becomes (0) and get (20).
| Place value | tens | ones | . | tenths |
| 0 | 20 | |||
| 1 | 2 | , | 0 | |
| 2 | , | 4 | ||
| - | 4 | , | 8 | |
| , |
Subtract the numbers in the tenths column from the top number:
20-0-4-8=8
| Place value | tens | ones | . | tenths |
| 0 | 20 | |||
| 1 | 2 | , | 0 | |
| 2 | , | 4 | ||
| - | 4 | , | 8 | |
| , | 8 |
Because the upper digit (0) 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 (10).
| Place value | tens | ones | . | tenths |
| 0 | 10 | |||
| 0 | 20 | |||
| 1 | 2 | , | 0 | |
| 2 | , | 4 | ||
| - | 4 | , | 8 | |
| , | 8 |
Subtract the numbers in the ones column from the top number:
10-2-4=4
| Place value | tens | ones | . | tenths |
| 0 | 10 | |||
| 0 | 20 | |||
| 1 | 2 | , | 0 | |
| 2 | , | 4 | ||
| - | 4 | , | 8 | |
| 4 | , | 8 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths |
| 0 | 10 | |||
| 0 | 20 | |||
| 1 | 2 | , | 0 | |
| 2 | , | 4 | ||
| - | 4 | , | 8 | |
| 0 | 4 | , | 8 |
The solution is: 4,8
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