$$2 \times 5.0 \times { 10 }^{ -2 }$$
$\frac{1}{10}=0.1$
$$10\times 10^{-2}$$
$$10\times \frac{1}{100}$$
$$\frac{1}{10}$$
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$\frac{1}{2 \cdot 5} = 0.1$