$$\frac{4}{5}+\frac{6}{4}=$$
$\frac{23}{10}=2.3$
$$\frac{4}{5}+\frac{3}{2}$$
$$\frac{8}{10}+\frac{15}{10}$$
$$\frac{8+15}{10}$$
$$\frac{23}{10}$$
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$\frac{23}{2 \cdot 5} = 2\frac{3}{10} = 2.3$