$$2 \frac { 5 } { 8 } \times 6 \frac { 8 } { 9 }$$
$\frac{217}{12}\approx 18.083333333$
$$\frac{16+5}{8}\times \frac{6\times 9+8}{9}$$
$$\frac{21}{8}\times \frac{6\times 9+8}{9}$$
$$\frac{21}{8}\times \frac{54+8}{9}$$
$$\frac{21}{8}\times \frac{62}{9}$$
$$\frac{21\times 62}{8\times 9}$$
$$\frac{1302}{72}$$
$$\frac{217}{12}$$
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$\frac{7 \cdot 31}{2 ^ {2} \cdot 3} = 18\frac{1}{12} = 18.083333333333332$
