Question

Find the $LCM$ and $HCL$ of the following integers by applying the prime factorization method.
$12,15$ and $21$

Answer 1

$12=2\times 2\times 3$

$15=3\times 5$

$21=3\times 7$

HCF$=3$

LCM$=2\times 2\times 3\times 5\times 7$=$420$