$\frac{1}{2} + \frac{1}{6} = \frac{4}{6}$

$\frac{1}{2} \times \frac{1}{6} = \frac{1}{12}$

$\frac{1}{2} - \frac{1}{6} = \frac{2}{6}$

$\frac{1}{2} \times \frac{1}{6} = \frac{1}{8}$