$$\frac{ 2 }{ 5 } 5 \frac { 1 } { 4 }$$
$\frac{21}{10}=2.1$
$$\frac{2}{5}\times \frac{20+1}{4}$$
$$\frac{2}{5}\times \frac{21}{4}$$
$$\frac{2\times 21}{5\times 4}$$
$$\frac{42}{20}$$
$$\frac{21}{10}$$
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$\frac{3 \cdot 7}{2 \cdot 5} = 2\frac{1}{10} = 2.1$
