$$\frac{5}{4}\div\frac{4}{5}$$
$\frac{25}{16}=1.5625$
$$\frac{5}{4}\times \frac{5}{4}$$
$$\frac{5\times 5}{4\times 4}$$
$$\frac{25}{16}$$
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$\frac{5 ^ {2}}{2 ^ {4}} = 1\frac{9}{16} = 1.5625$