The greatest common denominator of any set of denominators is infinite.
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The GCF of 255 and 256 is 1.
You need at least two numbers to find a GCF.
The greatest common factor of 120 and 245 is 5.
No. 255 is an odd number.
A common factor of 100 and 25 is 25. 25 goes into both 100 and 25. A good way to check other numbers is divide the larger number by the smaller number. If you have 10 and 25, that won't work, so you will have to find numbers that go into both. An easy way to do this is find different ways to get each number.Example:2x5=105x5=255 goes into each number at least one time, so it is a common factor.