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