$$6\frac{1}{8}\times\frac{7}{2}$$
$\frac{343}{16}=21.4375$
$$\frac{48+1}{8}\times \frac{7}{2}$$
$$\frac{49}{8}\times \frac{7}{2}$$
$$\frac{49\times 7}{8\times 2}$$
$$\frac{343}{16}$$
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$\frac{7 ^ {3}}{2 ^ {4}} = 21\frac{7}{16} = 21.4375$