Question
Find the $LCM$ of the numbers given below: $12, 18, 20$
✓
Answer
The given numbers are $12, 18$ and $20.$ We have:
$\begin{array}{c|c}2&12,18,20\\\hline2&6,9,10\\\hline3&3,9,5\\\hline3&1,3,5\\\hline5&1,1,5\\\hline&1,1,1\end{array}$
$\therefore LCM = 2 \times 2 \times 3 \times 3 \times 5$
$= 180$
$\begin{array}{c|c}2&12,18,20\\\hline2&6,9,10\\\hline3&3,9,5\\\hline3&1,3,5\\\hline5&1,1,5\\\hline&1,1,1\end{array}$
$\therefore LCM = 2 \times 2 \times 3 \times 3 \times 5$
$= 180$
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