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 \( \frac{3}{9} \) + \( \frac{5}{15} \)?
| 1 \( \frac{7}{15} \) | |
| \( \frac{9}{12} \) | |
| 2 \( \frac{3}{11} \) | |
| \(\frac{2}{3}\) |