$$1 \frac { 2 } { 5 } - 2 \frac { 3 } { 10 } + 3$$
$\frac{21}{10}=2.1$
$$\frac{5+2}{5}-\frac{2\times 10+3}{10}+3$$
$$\frac{7}{5}-\frac{2\times 10+3}{10}+3$$
$$\frac{7}{5}-\frac{20+3}{10}+3$$
$$\frac{7}{5}-\frac{23}{10}+3$$
$$\frac{14}{10}-\frac{23}{10}+3$$
$$\frac{14-23}{10}+3$$
$$-\frac{9}{10}+3$$
$$-\frac{9}{10}+\frac{30}{10}$$
$$\frac{-9+30}{10}$$
$$\frac{21}{10}$$
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$\frac{3 \cdot 7}{2 \cdot 5} = 2\frac{1}{10} = 2.1$
