$$3\frac{3}{8}-2\frac{3}{4}$$
$\frac{5}{8}=0.625$
$$\frac{24+3}{8}-\frac{2\times 4+3}{4}$$
$$\frac{27}{8}-\frac{2\times 4+3}{4}$$
$$\frac{27}{8}-\frac{8+3}{4}$$
$$\frac{27}{8}-\frac{11}{4}$$
$$\frac{27}{8}-\frac{22}{8}$$
$$\frac{27-22}{8}$$
$$\frac{5}{8}$$
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$\frac{5}{2 ^ {3}} = 0.625$