$$\frac{3}{5}+\frac{6}{20}$$
$\frac{9}{10}=0.9$
$$\frac{3}{5}+\frac{3}{10}$$
$$\frac{6}{10}+\frac{3}{10}$$
$$\frac{6+3}{10}$$
$$\frac{9}{10}$$
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$\frac{3 ^ {2}}{2 \cdot 5} = 0.9$