$$7\frac{1}{5}\times6\frac{1}{4}$$
$45$
$$\frac{35+1}{5}\times \frac{6\times 4+1}{4}$$
$$\frac{36}{5}\times \frac{6\times 4+1}{4}$$
$$\frac{36}{5}\times \frac{24+1}{4}$$
$$\frac{36}{5}\times \frac{25}{4}$$
$$\frac{36\times 25}{5\times 4}$$
$$\frac{900}{20}$$
$$45$$
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$3^{2}\times 5$
