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 \( \frac{3}{12} \) | |
| \( \frac{9}{17} \) | |
| \( \frac{2}{45} \) | |