start my multipliying the outside number to the numerator
[tex](\frac{12}{3})\cdot(\frac{2}{4})[/tex]simplify the fractions
[tex](4)\cdot(\frac{1}{2})[/tex]apply the multiplication like this
[tex]\frac{a}{b}\cdot\frac{c}{d}=\frac{cd}{bd}[/tex][tex](4)\cdot(\frac{1}{2})=\frac{4}{2}[/tex]SImplify
[tex](4)\cdot(\frac{1}{2})=\frac{4}{2}=2[/tex]