Simplify:

$\frac{16 m^{3} y^{2}}{4 m^{2} y}$

$=\frac{16 \times m \times m \times m \times y \times y}{4 \times m \times m \times y}$

$=4 m^{(3-2)} y^{(2-1)}$

$=4 m y$