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 \( \frac{9}{3} \) + \( \frac{9}{7} \)?
| 1 \( \frac{4}{21} \) | |
| 4\(\frac{2}{7}\) | |
| \( \frac{8}{21} \) | |
| 2 \( \frac{8}{21} \) |