Question
$\frac{4}{6}-\frac{3}{5}$

Answer

Smallest common multiple of 6 and 5 is 30. So,

$\begin{aligned} \frac{4}{6}-\frac{3}{5} & =\frac{4 \times 5}{6 \times 5}-\frac{3 \times 6}{5 \times 6} \\ & =\frac{20}{30}-\frac{18}{30} \\ & =\frac{20-18}{30}=\frac{2}{30}\end{aligned}$

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