Question

Find HCF and LCM of $90$ and $144$ by the prime factorization method.

Answer 1

Find HCF and LCM

Factors of $90$ are :

$90=3x3x2x5$

Factors of $144$are:

$144=2x2x2x2x3x3$

LCM of $90$ and $144$$=2x2x2x2x3x3x5=720$

HCF of $90$ and $144$$=3x3x2=18$

Hence LCM and HCF of $90$ and $144$ are $720$and $18$ respectively.