What is the greatest common factor of 90 and 33

It is 3 be cause if you do 60 * 3 = 90

11*3=33

So the greatest common factor is found by finding the factors and finding which ones are in both groups so exg (greatest common factor of 20 and 8 is 4 because 20:4*5 and 8=4*2 so 4 is the greastest common factor so)

90=3*3*2*5

33=11*3

the greatest common factor is 3