$$\frac{5}{8}-\frac{3}{10}$$
$\frac{13}{40}=0.325$
$$\frac{25}{40}-\frac{12}{40}$$
$$\frac{25-12}{40}$$
$$\frac{13}{40}$$
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$\frac{13}{2 ^ {3} \cdot 5} = 0.325$