The factors of 36 are:
1, 2, 3, 4, 6, 9, 12, 18, 36
The factors of 78 are:
1, 2, 3, 6, 13, 26, 39, 78
The factors of 120 are:
1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
The common factors are:
1, 2, 3, 6
The GCF is 6.
The greatest common factor of 78 and 120 is 6.
The GCF of 36, 42, and 78 is 6.
The Greatest Common Factor of 9, 36, 72: 9
The greatest common factor of 36 and 78 is 2
The GCF is 6.
The GCF is 6.
The GCF is 6.
The GCF is 3.
The GCF of 36, 40, and 78 is 2.The GCF can't be greater than the smallest difference between any of the numbers (40-36 = 4). 4 is not a factor of 78, so, factoring 4, the only other option is 2, which is a factor of all three numbers.
The greatest common factor of 78 and 546 is 78.
Since 26 is a factor of 78, all the factors of 26 are common to 78.