$$\frac{1}{2}+\frac{4}{5}$$
$\frac{13}{10}=1.3$
$$\frac{5}{10}+\frac{8}{10}$$
$$\frac{5+8}{10}$$
$$\frac{13}{10}$$
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$\frac{13}{2 \cdot 5} = 1\frac{3}{10} = 1.3$