$$\frac{ 3 }{ 8 } + \frac{ 5 }{ 8 } - \frac{ 4 }{ 8 } + \frac{ 9 }{ 8 }$$
$\frac{13}{8}=1.625$
$$\frac{3+5}{8}-\frac{4}{8}+\frac{9}{8}$$
$$\frac{8}{8}-\frac{4}{8}+\frac{9}{8}$$
$$1-\frac{4}{8}+\frac{9}{8}$$
$$1-\frac{1}{2}+\frac{9}{8}$$
$$\frac{2}{2}-\frac{1}{2}+\frac{9}{8}$$
$$\frac{2-1}{2}+\frac{9}{8}$$
$$\frac{1}{2}+\frac{9}{8}$$
$$\frac{4}{8}+\frac{9}{8}$$
$$\frac{4+9}{8}$$
$$\frac{13}{8}$$
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$\frac{13}{2 ^ {3}} = 1\frac{5}{8} = 1.625$
