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 \( \frac{4}{21} \) | |
| 1\(\frac{5}{7}\) | |
| \( \frac{9}{16} \) | |
| 2 \( \frac{7}{21} \) |