Question

What is the greatest common factor between 24 & 28

Answer 1

24:
1 and 24
6 and 4
2 and 3 2 and 2

So 24 = 1 X 2^3 X 3


28:
1 and 28
7 and 4
2 and 2

So 28 = 1 X 2^2 X 7

Therefore the greatest common factor of 24 and 28 is 2.