The greatest common factor of the numbers 120, 180 and 240 is 60. The GCF can't be any larger than the smallest difference between the numbers, which is 60. It is easy to see that 60 is a factor of each of the numbers in the set, so it is the GCF.
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60
The GCF is 15.
Oh, dude, the greatest common factor of 90, 120, and 180 is 30. It's like the cool kid that all these numbers can hang out with without any drama. So, yeah, 30 is the number they all have in common, making them like math buddies or something.
The Greatest Common Factor of 108, 180, 75 is 3.
The Greatest Common Factor (GCF) is: 20