$$3\times4\frac{2}{5}$$
$\frac{66}{5}=13.2$
$$3\times \frac{20+2}{5}$$
$$3\times \frac{22}{5}$$
$$\frac{3\times 22}{5}$$
$$\frac{66}{5}$$
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$\frac{2 \cdot 3 \cdot 11}{5} = 13\frac{1}{5} = 13.2$
