$$\frac{3}{7}\times455+\frac{5}{8}\times456=$$
$480$
$$\frac{3\times 455}{7}+\frac{5}{8}\times 456$$
$$\frac{1365}{7}+\frac{5}{8}\times 456$$
$$195+\frac{5}{8}\times 456$$
$$195+\frac{5\times 456}{8}$$
$$195+\frac{2280}{8}$$
$$195+285$$
$$480$$
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$2^{5}\times 3\times 5$
