$$5\frac{1}{4}\times5\frac{3}{4}$$
$\frac{483}{16}=30.1875$
$$\frac{20+1}{4}\times \frac{5\times 4+3}{4}$$
$$\frac{21}{4}\times \frac{5\times 4+3}{4}$$
$$\frac{21}{4}\times \frac{20+3}{4}$$
$$\frac{21}{4}\times \frac{23}{4}$$
$$\frac{21\times 23}{4\times 4}$$
$$\frac{483}{16}$$
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$\frac{3 \cdot 7 \cdot 23}{2 ^ {4}} = 30\frac{3}{16} = 30.1875$
