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1/8+1/2

$\begin{array}{lcl} \frac{1}{8} + \frac{1}{2}\\\\ &=& \frac{1}{8} + \frac{1}{2}\cdot \frac{4}{4}\\\\ &=& \frac{1}{8} + \frac{4}{8}\\\\ &=& \frac{5}{8}\\\\ &=& 0.625 \end{array}$