$$\frac{3}{8}-(\frac{1}{4})^{2}+2\frac{2}{3}$$
$\frac{143}{48}\approx 2.979166667$
$$\frac{3}{8}-\frac{1}{16}+\frac{2\times 3+2}{3}$$
$$\frac{6}{16}-\frac{1}{16}+\frac{2\times 3+2}{3}$$
$$\frac{6-1}{16}+\frac{2\times 3+2}{3}$$
$$\frac{5}{16}+\frac{2\times 3+2}{3}$$
$$\frac{5}{16}+\frac{6+2}{3}$$
$$\frac{5}{16}+\frac{8}{3}$$
$$\frac{15}{48}+\frac{128}{48}$$
$$\frac{15+128}{48}$$
$$\frac{143}{48}$$
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$\frac{11 \cdot 13}{2 ^ {4} \cdot 3} = 2\frac{47}{48} = 2.9791666666666665$
