[tex]\dfrac{?}{8}=\dfrac{16}{64}\ \ \ |cross\ multiply\\\\64?=8\cdot16\\\\64?=128\ \ \ \ |divide\ both\ sides\ by\ 64\\\\\boxed{?=2}\\\\Other\ method:\\\\\dfrac{?}{8}=\dfrac{16}{64}\\\\64:8=\boxed8\to16:\boxed8=2\\\\\boxed{\frac{2}{8}=\frac{16}{64}}[/tex]
