$$2 \times 5 \times 1.6 \times 10^{ -19 }$$
$0.0000000000000000016$
$$10\times 1.6\times 10^{-19}$$
$$16\times 10^{-19}$$
$$16\times \frac{1}{10000000000000000000}$$
$$\frac{1}{625000000000000000}$$
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$\frac{1}{2 ^ {15} \cdot 5 ^ {19}} = 1.5999999999999999 \times 10^{-18}$
