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 \( \frac{7}{8} \) - \( \frac{9}{10} \)?
| 1 \( \frac{9}{40} \) | |
| 2 \( \frac{5}{13} \) | |
| -\(\frac{1}{40}\) | |
| 2 \( \frac{8}{11} \) |