$$\frac{17}{4}\times\frac{21}{6}=$$
$\frac{119}{8}=14.875$
$$\frac{17}{4}\times \frac{7}{2}$$
$$\frac{17\times 7}{4\times 2}$$
$$\frac{119}{8}$$
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$\frac{7 \cdot 17}{2 ^ {3}} = 14\frac{7}{8} = 14.875$