Soluzione - Long subtraction
4,2
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| 7 | , | 1 | |
| - | 2 | , | 9 |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the tenths 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 (11).
| Place value | ones | . | tenths |
| 6 | 11 | ||
| 7 | , | 1 | |
| - | 2 | , | 9 |
| , |
Subtract the numbers in the tenths column from the top number:
11-9=2
| Place value | ones | . | tenths |
| 6 | 11 | ||
| 7 | , | 1 | |
| - | 2 | , | 9 |
| , | 2 |
Subtract the numbers in the ones column from the top number:
6-2=4
| Place value | ones | . | tenths |
| 6 | 11 | ||
| 7 | , | 1 | |
| - | 2 | , | 9 |
| 4 | , | 2 |
The solution is: 4,2
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