The prime factors of 100 are 2, 2, 5, and 5.
The prime factors of 120 are 2, 2, 2, 3, and 5.
The prime factors of 180 are 2, 2, 3, 3, and 5.
The prime factors that all three numbers have in common are 2, 2, and 5. Therefore, the greatest common factor is 2 x 2 x 5 = 20.
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The greatest common factor of 78 and 120 is 6.
The greatest common factor of 80 and 120 is 40.
The greatest common factor of 68 and 120 is 4.
The greatest common factor of 96 and 120 is 24.
The greatest common factor is 10.