$$\frac{1}{2}-\frac{3}{8}+\frac{1}{2}$$
$\frac{5}{8}=0.625$
$$\frac{4}{8}-\frac{3}{8}+\frac{1}{2}$$
$$\frac{4-3}{8}+\frac{1}{2}$$
$$\frac{1}{8}+\frac{1}{2}$$
$$\frac{1}{8}+\frac{4}{8}$$
$$\frac{1+4}{8}$$
$$\frac{5}{8}$$
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$\frac{5}{2 ^ {3}} = 0.625$