Find the HCF of the following numbers using the common factor method.

$180,204$

Find the LCM of the following numbers using the prime factorisation method.

$42$ and $56$

Find the LCM of the following numbers using the prime factorisation method.

$192$ and $240$

Find the LCM of the following numbers using the common division method.

$\mathrm{28,42,63}$

Find the LCM of the following numbers using the common division method.

$36,48,54$

Find the LCM using the division method.

$625$ and $325$