The least common factor is a term often mistakenly given to either the greatest common factor (GCF) or the least common multiple (LCM). This term is not often used because it does not describe a useful relationship between numbers. Since 1 evenly divides all integers, 1 is technically the least common factor for any set of integers.
The smallest non-one common factor of 15 and 40 is 5.
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The least common factor is: 1
15/40 = 3/8 by dividing the highest common factor of 15 and 40 which is 5
The least common factor of any set of positive integers is 1.
The greatest common factor of 15 and 40 is 5
5