19/20-9/20

To subtract \( \frac{9}{20} \) from \( \frac{19}{20} \), you keep the denominator the same and subtract the numerators:

\[ \frac{19}{20} - \frac{9}{20} = \frac{19 - 9}{20} = \frac{10}{20} \]

Now, simplify \( \frac{10}{20} \):

\[ \frac{10}{20} = \frac{1}{2} \]

So, \( \frac{19}{20} - \frac{9}{20} = \frac{1}{2} \).