As stated, this question does not appear to be particularly useful. The lowest common factor of the numbers is 1. The lowest common MULTIPLE of the three numbers, which could be of use, is 30.
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The least common factor is: 1
The Greatest Common Factor (GCF) of 3 and 18 is: 3
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.
The factors of 18 are: 1, 2, 3, 6, 9, & 18 The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, & 30 The GCF is 6 The LCF (AKA Lowest Common Factor) is 1 & 2 1, 2, 3, & 6 are all the Common factors.
The Greatest Common Factor of 3 and 8 is 1.