$$\frac{ 2 }{ 5 } \div \frac{ 5 }{ 2 }$$
$\frac{4}{25}=0.16$
$$\frac{2}{5}\times \frac{2}{5}$$
$$\frac{2\times 2}{5\times 5}$$
$$\frac{4}{25}$$
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$\frac{2 ^ {2}}{5 ^ {2}} = 0.16$