$$2\times\frac{22}{7}$$
$\frac{44}{7}\approx 6.285714286$
$$\frac{2\times 22}{7}$$
$$\frac{44}{7}$$
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$\frac{2 ^ {2} \cdot 11}{7} = 6\frac{2}{7} = 6.285714285714286$
