Lots of numbers are NOT common factors. For example, 5, 7, 100...Get the greatest common factor of both numbers. All common factors are factors of this greatest common factor. Note that all of them must needs be less than or equal to the greatest common factor.
Any other number is NOT a common factor.
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The least common factor of any set of integers is 1.
The least common factor of any set of positive integers is 1.
The least common factor of any set of positive integers is 1.
The least common multiple f the numbers 12 and 30 is 60.
The Least Common Multiple (LCM) for 12 30 4 is 60.