Fractions must share a common denominator in order to be added or subtracted. The common denominator is the least common multiple of all the denominators.
What is \( \frac{2}{8} \) - \( \frac{7}{10} \)?
| 1 \( \frac{8}{40} \) | |
| -\(\frac{9}{20}\) | |
| \( \frac{7}{12} \) | |
| 1 \( \frac{2}{40} \) |