$$\frac{15^{4}\times10^{-6}}{5^{-2}}$$
$\frac{81}{64}=1.265625$
$$\frac{50625\times 10^{-6}}{5^{-2}}$$
$$\frac{50625\times \frac{1}{1000000}}{5^{-2}}$$
$$\frac{\frac{81}{1600}}{5^{-2}}$$
$$\frac{\frac{81}{1600}}{\frac{1}{25}}$$
$$\frac{81}{1600}\times 25$$
$$\frac{81}{64}$$
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$\frac{3 ^ {4}}{2 ^ {6}} = 1\frac{17}{64} = 1.265625$
