Question

Find LCM by division method: $48,72,80$.

Answer 1

Find the LCM of $48,72,80$:

$\begin{array}{cc}2& 48,72,80\\ 2& 24,36,40\\ 2& 12,18,20\\ 2& 6,9,10\\ 3& 3,9,5\\ 3& 1,3,5\\ 5& 1,1,5\\ & 1,1,1\end{array}$

So, the LCM of $48,72,80=2\times 2\times 2\times 2\times 3\times 3\times 5$

$=720$

Hence, the LCM of $48,72,80=720$.