$$\frac{4}{9}+\frac{5}{18}$$
$\frac{13}{18}\approx 0.722222222$
$$\frac{8}{18}+\frac{5}{18}$$
$$\frac{8+5}{18}$$
$$\frac{13}{18}$$
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$\frac{13}{2 \cdot 3 ^ {2}} = 0.7222222222222222$