$$8+\frac{1}{2}$$
$\frac{17}{2}=8.5$
$$\frac{16}{2}+\frac{1}{2}$$
$$\frac{16+1}{2}$$
$$\frac{17}{2}$$
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$\frac{17}{2} = 8\frac{1}{2} = 8.5$