Question

Subtract $2\frac{1}{2}$ from $3\frac{3}{4}$.

Answer 1

$2\frac{1}{2}$ can be written as $\frac{2\times 2+1}{2}=\frac{5}{2}$
$3\frac{3}{4}$can be written as $\frac{3\times 4+3}{4}=\frac{15}{4}$
$\frac{15}{4}-\frac{5}{2}$ = $\frac{15-5\times 2}{4}$ = $\frac{15-10}{4}$ = $\frac{5}{4}$