$$\frac{1}{2}:\frac{4}{5}$$
$\frac{5}{8}=0.625$
$$\frac{1}{2}\times \frac{5}{4}$$
$$\frac{1\times 5}{2\times 4}$$
$$\frac{5}{8}$$
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$\frac{5}{2 ^ {3}} = 0.625$