$\frac{4}{24} = \frac{1 * 4}{6 * 4} = \frac{1}{6}$
$\frac{5}{20} = \frac{1 * 5}{4 * 5} = \frac{1}{4}$
$\frac{4}{20} = \frac{1 * 4}{5 * 4} = \frac{1}{5}$
$\frac{8}{16} = \frac{1 * 8}{2 * 8} = \frac{1}{2}$
$\frac{10}{40} = \frac{1 * 10}{4 * 10} = \frac{1}{4}$
$\frac{5}{50} = \frac{1 * 5}{10 * 5} = \frac{1}{10}$

$\frac{2}{4} = \frac{1 * 2}{2 * 2} = \frac{1}{2}$
$\frac{3}{9} = \frac{1 * 3}{3 * 3} = \frac{1}{3}$
$\frac{4}{16} = \frac{1 * 4}{4 * 4} = \frac{1}{4}$
$\frac{9}{45} = \frac{1 * 9}{5 * 9} = \frac{1}{5}$
$\frac{11}{66} = \frac{1 * 11}{6 * 11} = \frac{1}{6}$
$\frac{5}{35} = \frac{1 * 5}{7 * 5} = \frac{1}{7}$