$$\frac{ 9 }{ 15 } - \frac{ 1 }{ 2 } =$$
$\frac{1}{10}=0.1$
$$\frac{3}{5}-\frac{1}{2}$$
$$\frac{6}{10}-\frac{5}{10}$$
$$\frac{6-5}{10}$$
$$\frac{1}{10}$$
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$\frac{1}{2 \cdot 5} = 0.1$