$$\frac{ 2 }{ 1 } \frac{ 4 }{ 1 } \frac{ 5 }{ 1 }$$
$40$
$$2\times \frac{4}{1}\times \frac{5}{1}$$
$$2\times 4\times \frac{5}{1}$$
$$8\times \frac{5}{1}$$
$$8\times 5$$
$$40$$
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$2^{3}\times 5$
