Soluzione - Long subtraction
4,4
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 0 | , | 2 | |
| - | 5 | , | 8 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (2) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (10) which becomes (09) and get (12).
| Place value | tens | ones | . | tenths |
| 0 | 12 | |||
| 1 | 0 | , | 2 | |
| - | 5 | , | 8 | |
| , |
Subtract the numbers in the tenths column from the top number:
12-8=4
| Place value | tens | ones | . | tenths |
| 0 | 12 | |||
| 1 | 0 | , | 2 | |
| - | 5 | , | 8 | |
| , | 4 |
Subtract the numbers in the ones column from the top number:
9-5=4
| Place value | tens | ones | . | tenths |
| 0 | 12 | |||
| 1 | 0 | , | 2 | |
| - | 5 | , | 8 | |
| 4 | , | 4 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths |
| 0 | 12 | |||
| 1 | 0 | , | 2 | |
| - | 5 | , | 8 | |
| 0 | 4 | , | 4 |
The solution is: 4,4
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