Find the prime factorization of:

$2145$

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

$84$ and $108$

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

$144$ and $180$

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

$105$, $168$

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.

$36,48,54$