(8) \( \frac{5}{6}-\frac{21}{28} \)

To perform the subtraction \( \frac{5}{6} - \frac{21}{28} \), we first need a common denominator. The least common multiple of 6 and 28 is 84. Now, we convert both fractions: - For \( \frac{5}{6} \): \( \frac{5 \times 14}{6 \times 14} = \frac{70}{84} \) - For \( \frac{21}{28} \): \( \frac{21 \times 3}{28 \times 3} = \frac{63}{84} \) Now, subtract: \( \frac{70}{84} - \frac{63}{84} = \frac{70 - 63}{84} = \frac{7}{84} \) Now, simplify \( \frac{7}{84} = \frac{1}{12} \). So, \( \frac{5}{6} - \frac{21}{28} = \frac{1}{12} \).