The lowest common factor refers to a comparison between at least two sets of factors. There is no LCF of a single number like 6. That being said, the answer is 1, because the LCF for 6 and any other number is 1.
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The lowest common factor of any set of positive integers is 1.
The lowest common factor of any set of integers is 1.
The least common factor is: 1
The lowest common factor of 6 and 15 is 1. However, I suspect you either want their lowest common multiple (ie the smallest number into which both 6 and 15 divide) or their highest common factor (the largest number which will divided into both 6 and 15). LCM: 6 = 2 x 3 15 = 3 x 5 LCM = 2 x 3 x 5 = 30 HCF: 6 = 2 x 3 15 = 3 x 5 HCF = 3.
5, because since 5 is a prime number (meaning it has only two factors, 1 and 5) its largest factor period is itself. 1 and 5 both go into 20 evenly, so the LCF is 5.