$$\frac{7}{27}\div\frac{49}{81}$$
$\frac{3}{7}\approx 0.428571429$
$$\frac{7}{27}\times \frac{81}{49}$$
$$\frac{7\times 81}{27\times 49}$$
$$\frac{567}{1323}$$
$$\frac{3}{7}$$
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$\frac{3}{7} = 0.42857142857142855$