$$\frac{10}{20}\times\frac{1}{2}$$
$\frac{1}{4}=0.25$
$$\frac{1}{2}\times \frac{1}{2}$$
$$\frac{1\times 1}{2\times 2}$$
$$\frac{1}{4}$$
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$\frac{1}{2 ^ {2}} = 0.25$