Question
$\frac{2}{7}-\frac{1}{4}$
✓
Answer
Smallest common multiple of 7 and 4 is 28.
$\begin{aligned} \frac{2}{7}-\frac{1}{4} & =\frac{2 \times 4}{7 \times 4}-\frac{1 \times 7}{4 \times 7} \\ & =\frac{8}{28}-\frac{7}{28} \\ & =\frac{8-7}{28}=\frac{1}{28}\end{aligned}$
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