Question

Find the $LCM$ of the following numbers by prime factorisation method.
$48,56$ and $72$

Answer 1

Prime factor of $48=2\times 2\times 2\times 2\times 3$

Prime factor of $56=2\times 2\times 2\times 7$

Prime factor of $72=2\times 2\times 2\times 3\times 3$

Then, $LCM=2\times 2\times 2\times 3\times 3\times 7=504$

Hence, this is the answer.