$$3 \times { 10 }^{ -8 }$$
$\frac{3}{100000000}=0.00000003$
$$3\times \frac{1}{100000000}$$
$$\frac{3}{100000000}$$
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$\frac{3}{2 ^ {8} \cdot 5 ^ {8}} = 2.9999999999999996 \times 10^{-8}$