$$2 \frac{ 1 }{ 10 } \times 15$$
$\frac{63}{2}=31.5$
$$\frac{20+1}{10}\times 15$$
$$\frac{21}{10}\times 15$$
$$\frac{21\times 15}{10}$$
$$\frac{315}{10}$$
$$\frac{63}{2}$$
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$\frac{3 ^ {2} \cdot 7}{2} = 31\frac{1}{2} = 31.5$
