$\frac{20}{118} = \frac{10 * 2}{59 * 2} = \frac{10}{59}$;
$\frac{236}{444} = \frac{59 * 4}{111 * 4} = \frac{59}{111}$;
$\frac{66}{102} = \frac{11 * 6}{17 * 6} = \frac{11}{17}$;
$\frac{128}{28} = \frac{32 * 4}{7 * 4} = \frac{32}{7}$.

$\frac{108}{72} = \frac{3 * 36}{2 * 36} = \frac{3}{2}$;
$\frac{36}{243} = \frac{4 * 9}{27 * 9} = \frac{4}{27}$;
$\frac{120}{168} = \frac{5 * 24}{7 * 24} = \frac{5}{7}$;
$\frac{720}{640} = \frac{9 * 80}{8 * 80} = \frac{9}{8}$.