$$2\frac{4}{5}\cdot\frac{1}{2}\times1\frac{1}{2}$$
$\frac{21}{10}=2.1$
$$\frac{10+4}{5}\times \frac{1}{2}\times \frac{1\times 2+1}{2}$$
$$\frac{14}{5}\times \frac{1}{2}\times \frac{1\times 2+1}{2}$$
$$\frac{14\times 1}{5\times 2}\times \frac{1\times 2+1}{2}$$
$$\frac{14}{10}\times \frac{1\times 2+1}{2}$$
$$\frac{7}{5}\times \frac{1\times 2+1}{2}$$
$$\frac{7}{5}\times \frac{2+1}{2}$$
$$\frac{7}{5}\times \frac{3}{2}$$
$$\frac{7\times 3}{5\times 2}$$
$$\frac{21}{10}$$
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$\frac{3 \cdot 7}{2 \cdot 5} = 2\frac{1}{10} = 2.1$
