$$\frac{5}{12}+\frac{2}{9}$$
$\frac{23}{36}\approx 0.638888889$
$$\frac{15}{36}+\frac{8}{36}$$
$$\frac{15+8}{36}$$
$$\frac{23}{36}$$
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$\frac{23}{2 ^ {2} \cdot 3 ^ {2}} = 0.6388888888888888$