$$2\frac{5}{8}\times4\frac{3}{5}=$$
$\frac{483}{40}=12.075$
$$\frac{16+5}{8}\times \frac{4\times 5+3}{5}$$
$$\frac{21}{8}\times \frac{4\times 5+3}{5}$$
$$\frac{21}{8}\times \frac{20+3}{5}$$
$$\frac{21}{8}\times \frac{23}{5}$$
$$\frac{21\times 23}{8\times 5}$$
$$\frac{483}{40}$$
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$\frac{3 \cdot 7 \cdot 23}{2 ^ {3} \cdot 5} = 12\frac{3}{40} = 12.075$
