Find the common factors of:

$45, 60$ and $105$

Find the first three common multiples of:

$8$ and $12$

Find the first three common multiples of:

$6$ and $9$

Find the first three common multiples of:

$10$ and $25$

Following pair of numbers are co-prime?

$13$ and $16$

Following pair of numbers are co-prime?

$16$ and $21$

Following pair of numbers are co-prime?

$25$ and $105$