To calculate \(9/24 - 11/24\), you can subtract the fractions directly since they have a common denominator:
\[ \frac{9}{24} - \frac{11}{24} = \frac{9 - 11}{24} = \frac{-2}{24} \]
Now, simplify the fraction:
\[ \frac{-2}{24} = \frac{-1}{12} \]
So, \(9/24 - 11/24 = -\frac{1}{12}\).