Find the HCF of these numbers using the prime factorisation method.

$88 \mathrm{and} 168$

Find the HCF of the below numbers using the prime factorisation method.

$504 \mathrm{and} 168$

Find the HCF of $20$ and $90$ by the long division method.

Find the HCF of the below numbers by the long division method.

$45 \mathrm{and} 65$

Find the HCF of the below numbers by the long division method.

$16 \mathrm{and} 48$

Find the HCF of below numbers by the long division method.

$28 \mathrm{and} 36$

Find the HCF of below numbers by the long division method.

$15 \mathrm{and} 25$

Find the HCF of below numbers by the long division method.

$32 \mathrm{and} 128$

Find the largest number that divides $48$ and $72$ without leaving a remainder.