$\frac{2}{7}\cdot 14=\frac{2}{1}\cdot 2=\frac{4}{1}=4$

$\frac{1}{4}\cdot 16=\frac{1}{1}\cdot 4=\frac{4}{1}=4$

$\frac{5}{6}\cdot 4=\frac{20}{6}=3\frac{2}{6}=3\frac{1}{3}$

$\frac{2}{3}\cdot 27=\frac{2}{1}\cdot 9=\frac{18}{1}=18$

$\frac{2}{9}\cdot 15=\frac{2}{3}\cdot 5=\frac{10}{3}=3\frac{1}{3}$