$$2+ \frac{ 3 }{ 10 }$$
$\frac{23}{10}=2.3$
$$\frac{20}{10}+\frac{3}{10}$$
$$\frac{20+3}{10}$$
$$\frac{23}{10}$$
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$\frac{23}{2 \cdot 5} = 2\frac{3}{10} = 2.3$