The least common factor of 5 and 12 is the smallest number which divides both of them and it is 1, as it is for all pairs of numbers.
(It is also the highest common factor of 5 and 12, as 5 and 12 only have one common factor: 1.)
The least, or lowest, common multiple of a pair of numbers is the smallest number which is a multiple of both of them, which for 5 and 12 is 60.
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The least common factor of any two or more positive integers is always 1.
The least common factor of any set of integers is 1.
The least common factor of any set of numbers is 1.
The least common multiple of the numbers 3, 12 and 5 is 60.
The least common factor of any set of numbers is 1.30