Find $\mathrm{HCF}$ and $\mathrm{LCM}$ of following pairs of integers by prime factorisation method and verify that $LCM\times HCF=$ Product of the two numbers

$21, 315$

Find $\mathrm{HCF}$ and $\mathrm{LCM}$ of following pairs of integers by prime factorisation method and verify that $LCM\times HCF=$ Product of the two numbers

$77, 979$

Find the HCF and LCM of the following positive integers by applying the prime factorisation method.

$24, 36, 176$

Find the HCF and LCM of the following positive integers by applying the prime factorisation method.

Find the HCF and LCM of the following positive integers by applying the prime factorisation method.