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 \( \frac{9}{4} \) + \( \frac{9}{12} \)?
| \( \frac{1}{7} \) | |
| 1 \( \frac{5}{12} \) | |
| 3 | |
| 1 \( \frac{2}{12} \) |