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 \( \frac{9}{4} \) - \( \frac{9}{10} \)?
| 2 \( \frac{7}{15} \) | |
| 2 \( \frac{6}{20} \) | |
| 2 \( \frac{3}{6} \) | |
| 1\(\frac{7}{20}\) |