$$(8/10-10/10) \times (2/4+1/2)$$
$-\frac{1}{5}=-0.2$
$$\left(\frac{8}{10}-1\right)\left(\frac{2}{4}+\frac{1}{2}\right)$$
$$\left(\frac{4}{5}-1\right)\left(\frac{2}{4}+\frac{1}{2}\right)$$
$$\left(\frac{4}{5}-\frac{5}{5}\right)\left(\frac{2}{4}+\frac{1}{2}\right)$$
$$\frac{4-5}{5}\left(\frac{2}{4}+\frac{1}{2}\right)$$
$$-\frac{1}{5}\left(\frac{2}{4}+\frac{1}{2}\right)$$
$$-\frac{1}{5}\left(\frac{1}{2}+\frac{1}{2}\right)$$
$$-\frac{1}{5}\times \frac{1+1}{2}$$
$$-\frac{1}{5}\times \frac{2}{2}$$
$$-\frac{1}{5}$$
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$-\frac{1}{5} = -0.2$
