$$4 \frac{ \sqrt{ 16 } }{ \sqrt{ 625 } }$$
$\frac{16}{25}=0.64$
$$4\times \frac{4}{\sqrt{625}}$$
$$4\times \frac{4}{25}$$
$$\frac{4\times 4}{25}$$
$$\frac{16}{25}$$
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$\frac{2 ^ {4}}{5 ^ {2}} = 0.64$
