$$\frac{1}{2}\times5\times10^{-1}$$
$\frac{1}{4}=0.25$
$$\frac{5}{2}\times 10^{-1}$$
$$\frac{5}{2}\times \frac{1}{10}$$
$$\frac{1}{4}$$
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$\frac{1}{2 ^ {2}} = 0.25$
