Question

Question 3 (i)
Find the LCM and HCF of 12, 15 and 21 by applying the prime factorization method.

Answer 1

$12=2\times 2\times 3$
$15=3\times 5$
$21=3\times 7$
$HCF=3$
$LCM=2\times 2\times 3\times 5\times 7=420$