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 \( \frac{7}{8} \) - \( \frac{3}{10} \)?
| \( \frac{6}{10} \) | |
| \( \frac{8}{12} \) | |
| 2 \( \frac{1}{4} \) | |
| \(\frac{23}{40}\) |