$\frac{3}{5}$ +$\frac{2}{3}$
=$\frac{9}{15}$ + $\frac{10}{15}$
=$\frac{19}{15}$
$\frac{12}{5}$ - 2
=$\frac{12}{5}$ -$\frac{10}{5}$
=$\frac{2}{5}$
$\frac{3}{5}$ ×$\frac{2}{3}$
=$\frac{6}{15}$
$\frac{3}{5}$ ÷4
=$\frac{3}{5}$ ÷ $\frac{4}{1}$
=$\frac{3}{5}$ × $\frac{1}{4}$
=$\frac{3}{20}$