$$2\frac{1}{4}\times\frac{4}{5}=\_$$
$\frac{9}{5}=1.8$
$$\frac{8+1}{4}\times \frac{4}{5}$$
$$\frac{9}{4}\times \frac{4}{5}$$
$$\frac{9\times 4}{4\times 5}$$
$$\frac{9}{5}$$
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$\frac{3 ^ {2}}{5} = 1\frac{4}{5} = 1.8$
