$$\frac { 1 } { 2 } - \frac { 10 } { 4 } - \frac { 1 } { 10 }$$
$-\frac{21}{10}=-2.1$
$$\frac{1}{2}-\frac{5}{2}-\frac{1}{10}$$
$$\frac{1-5}{2}-\frac{1}{10}$$
$$\frac{-4}{2}-\frac{1}{10}$$
$$-2-\frac{1}{10}$$
$$-\frac{20}{10}-\frac{1}{10}$$
$$\frac{-20-1}{10}$$
$$-\frac{21}{10}$$
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$-\frac{21}{10} = -2\frac{1}{10} = -2.1$
