$$\frac{ 2.7 \times { 10 }^{ -3 } }{ 5.5 \times 104 } =$$
$\frac{27}{5720000}\approx 0.00000472$
$$\frac{2.7\times \frac{1}{1000}}{5.5\times 104}$$
$$\frac{\frac{27}{10000}}{5.5\times 104}$$
$$\frac{\frac{27}{10000}}{572}$$
$$\frac{27}{10000\times 572}$$
$$\frac{27}{5720000}$$
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$\frac{3 ^ {3}}{11 \cdot 13 \cdot 2 ^ {6} \cdot 5 ^ {4}} = 4.720279720279721 \times 10^{-6}$