Question

Common Factor in table of 15 and 18

Answer 1

3
I can find only 3.
Hope it helps.

Answer 2

The common factors in (3*5) and (2*3*3) is 3, and it is the highest common factor also, as no other factor higher than 3 divide both 15 and 18 together. Therefore LCM (15,18) = (15/3)18 = 90.