$$\frac{1}{2}+\frac{(-1)}{5}+\frac{1}{4}+\frac{(-1)}{10}$$
$\frac{9}{20}=0.45$
$$\frac{1}{2}-\frac{1}{5}+\frac{1}{4}+\frac{-1}{10}$$
$$\frac{5}{10}-\frac{2}{10}+\frac{1}{4}+\frac{-1}{10}$$
$$\frac{5-2}{10}+\frac{1}{4}+\frac{-1}{10}$$
$$\frac{3}{10}+\frac{1}{4}+\frac{-1}{10}$$
$$\frac{6}{20}+\frac{5}{20}+\frac{-1}{10}$$
$$\frac{6+5}{20}+\frac{-1}{10}$$
$$\frac{11}{20}+\frac{-1}{10}$$
$$\frac{11}{20}-\frac{1}{10}$$
$$\frac{11}{20}-\frac{2}{20}$$
$$\frac{11-2}{20}$$
$$\frac{9}{20}$$
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$\frac{3 ^ {2}}{2 ^ {2} \cdot 5} = 0.45$
