Find the HCF of the following numbers by listing the factors.

$27,81$

Find the HCF of the following numbers by listing the factors.

$12,16$

Find the HCF of the following numbers by listing the factors.

$9,27,135$

Find the HCF of the following numbers by listing the factors.

$6,18,32$

Using the long division method find the HCF of the following numbers.

$575,920$

Using the long division method find the HCF of the following numbers.

$891,1377$

Using the long division method find the HCF of the following numbers.

$1850,2736$

Using the long division method find the HCF of the following numbers.

$2057,3267$