$$(5^{-1}\times8^{-1})\div16^{-1}$$
$\frac{2}{5}=0.4$
$$\frac{\frac{1}{5}\times 8^{-1}}{16^{-1}}$$
$$\frac{\frac{1}{5}\times \frac{1}{8}}{16^{-1}}$$
$$\frac{\frac{1}{40}}{16^{-1}}$$
$$\frac{\frac{1}{40}}{\frac{1}{16}}$$
$$\frac{1}{40}\times 16$$
$$\frac{2}{5}$$
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$\frac{2}{5} = 0.4$
