$$( 12 \times 10 ^ { - 18 } ) ( 5 \times 10 ^ { 8 } )$$
$\frac{3}{500000000}=6 \cdot 10^{-9}$
$$12\times 10^{-10}\times 5$$
$$12\times \frac{1}{10000000000}\times 5$$
$$\frac{3}{2500000000}\times 5$$
$$\frac{3}{500000000}$$
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$\frac{3}{2 ^ {8} \cdot 5 ^ {9}} = 6 \times 10^{-9}$
