$$\frac{4}{9}+\frac{6}{12}=$$
$\frac{17}{18}\approx 0.944444444$
$$\frac{4}{9}+\frac{1}{2}$$
$$\frac{8}{18}+\frac{9}{18}$$
$$\frac{8+9}{18}$$
$$\frac{17}{18}$$
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$\frac{17}{2 \cdot 3 ^ {2}} = 0.9444444444444444$