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.

$9, 27, 35$

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

$6, 18, 32$

Find the HCF using the long division method.

$38, 194$

Find the HCF using the long division method.

$546, 940$

Find the HCF using the long division method.

$225, 300$

Find the HCF using the long division method.

$63, 90$