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 \( \frac{9}{3} \) + \( \frac{5}{7} \)?
| \( \frac{7}{15} \) | |
| 1 \( \frac{9}{21} \) | |
| \( \frac{5}{8} \) | |
| 3\(\frac{643}{900}\) |