Question

Find the $L.C.M.$ of the numbers $180,72$ and $252$.

Answer 1

First we have to find factors for the numbers:

$180=2\times 2\times 3\times 3\times 5$

$72=2\times 2\times 2\times 3\times 3$

$252=2\times 2\times 3\times 3\times 7$

LCM $=2\times 2\times 2\times 3\times 3\times 5\times 7=2520$