What is the greatest common factor of 30 and 54?

The greatest common factor of 30 and 54 is 6.

The greatest common factor is the highest number that divides exactly into two or more numbers.

30: 1, 2, 3, 5, 6, 10, 15, 30

54: 1, 2, 3, 6, 9, 18, 27, 54

The greatest common factor of 30 and 54 is is 6.