Question
$\frac{3}{10}-\frac{1}{20}$
✓
Answer
20 is the multiples of 10. So,
$\begin{aligned} & \frac{3}{10}-\frac{1}{20}=\frac{3 \times 2}{10 \times 2}-\frac{1}{20} \\ & =\frac{6}{20}-\frac{1}{20} \\ & =\frac{6-1}{20}=\frac{5}{20}\end{aligned}$
$\frac{5}{20}$
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