$\frac{11}{2}$ = $\frac{11 x 5}{2 x 5}$ = $\frac{55}{10}$
$\frac{15}{4}$ = $\frac{15 x 25}{4 x 25}$ = $\frac{375}{100}$
$\frac{31}{5}$ = $\frac{31 x 2}{5 x 2}$ = $\frac{62}{10}$
$\frac{11}{2}$ = $\frac{11 x 5}{2 x 5}$ = $\frac{55}{10}$
$\frac{15}{4}$ = $\frac{15 x 25}{4 x 25}$ = $\frac{375}{100}$
$\frac{31}{5}$ = $\frac{31 x 2}{5 x 2}$ = $\frac{62}{10}$