Soluzione - Long subtraction
10,1
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 6 | , | 8 | |
| 1 | , | 8 | ||
| - | 4 | , | 9 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (8) in the tenths column is too small to get a positive difference, borrow 1 from the digit (6) in the next number place which becomes (5) and get (18).
| Place value | tens | ones | . | tenths |
| 5 | 18 | |||
| 1 | 6 | , | 8 | |
| 1 | , | 8 | ||
| - | 4 | , | 9 | |
| , |
Subtract the numbers in the tenths column from the top number:
18-8-9=1
| Place value | tens | ones | . | tenths |
| 5 | 18 | |||
| 1 | 6 | , | 8 | |
| 1 | , | 8 | ||
| - | 4 | , | 9 | |
| , | 1 |
Subtract the numbers in the ones column from the top number:
5-1-4=0
| Place value | tens | ones | . | tenths |
| 5 | 18 | |||
| 1 | 6 | , | 8 | |
| 1 | , | 8 | ||
| - | 4 | , | 9 | |
| 0 | , | 1 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 5 | 18 | |||
| 1 | 6 | , | 8 | |
| 1 | , | 8 | ||
| - | 4 | , | 9 | |
| 1 | 0 | , | 1 |
The solution is: 10,1
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