$$20\frac{1}{1}\frac{4}{8}=$$
$\frac{21}{2}=10.5$
$$\frac{20+1}{1}\times \frac{4}{8}$$
$$\frac{21}{1}\times \frac{4}{8}$$
$$21\times \frac{4}{8}$$
$$21\times \frac{1}{2}$$
$$\frac{21}{2}$$
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$\frac{3 \cdot 7}{2} = 10\frac{1}{2} = 10.5$
