$$3\frac{1}{8}+[-\frac{1}{4}]$$
$\frac{23}{8}=2.875$
$$\frac{24+1}{8}-\frac{1}{4}$$
$$\frac{25}{8}-\frac{1}{4}$$
$$\frac{25}{8}-\frac{2}{8}$$
$$\frac{25-2}{8}$$
$$\frac{23}{8}$$
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$\frac{23}{2 ^ {3}} = 2\frac{7}{8} = 2.875$
