Find the greatest number that divides each of $180, 225$ and $315$ completely.

Find the pairs of co-prime numbers.

$15,16,21, \text{and} 28$

Find the greatest number that can divide $93,111$ and $129$, with remainder $3$ in each case.

(Since,$93-3=90, 111-3=108$ and $129-3=126$)

Using common multiple method, find the L.C.M of the following:

$8, 12$ and $24$ 

Using common multiple method, find the L.C.M of the following:

$10, 15$ and $20$ 

Using common multiple method, find the L.C.M of the following:

$3, 6, 9$ and $12$ 

Find the L.C.M of following numbers, using (i) Prime factor method and (ii) Common division method.

Find the L.C.M of following numbers, using (i) Prime factor method and (ii) Common division method.