Question
Add: $\frac{-5}{9}$ and $\frac{7}{18} \mathrm{}$
✓
Answer
$\begin{aligned} & \frac{-5}{9} \text { and } \frac{7}{18}=\frac{-5}{9}+\frac{7}{18} \\ & =\frac{-5 \times 2}{9 \times 2}+\frac{7 \times 1}{18 \times 1} \\ & (\because \text { L.C.M. of } 9 \text { and } 18=18) \\ & =\frac{-10}{18}+\frac{7}{18} \\ & =\frac{-10+7}{18}=\frac{-3}{18}\end{aligned}$
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