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 \( \frac{5}{8} \) + \( \frac{9}{10} \)?
| \( \frac{6}{15} \) | |
| 1 \( \frac{3}{40} \) | |
| 1 \( \frac{3}{6} \) | |
| 1\(\frac{21}{40}\) |