Factor both numbers. Select the factors they both have in common. Choose the largest (greatest) one.
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The highest common factor of two numbers is their highest common factor. The method that is used to find it is irrelevant.
You need at least two numbers to find a GCF.
That's the greatest common factor, or GCF.
The Greatest Common Factor, or GCF.
It depends on what the numbers are. For example, if the prime numbers you were talking about were 3 and 7, the least common multiple would be 21. If your numbers were 2 and 3, it would be 6.
When they have a factor in common greater than one.