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 \( \frac{9}{8} \) - \( \frac{9}{10} \)?
| 2 \( \frac{3}{11} \) | |
| 2 \( \frac{8}{11} \) | |
| \(\frac{2}{9}\) | |
| 2 \( \frac{9}{40} \) |