$$\frac{ 1 }{ 5 } - \frac{ 1 }{ 25 }$$
$\frac{4}{25}=0.16$
$$\frac{5}{25}-\frac{1}{25}$$
$$\frac{5-1}{25}$$
$$\frac{4}{25}$$
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$\frac{2 ^ {2}}{5 ^ {2}} = 0.16$