$$5\div\frac{2}{5}$$
$\frac{25}{2}=12.5$
$$5\times \frac{5}{2}$$
$$\frac{5\times 5}{2}$$
$$\frac{25}{2}$$
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$\frac{5 ^ {2}}{2} = 12\frac{1}{2} = 12.5$