The lowest common factor of any set of positive integers is 1.
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The least common factor of any set of numbers is 1.
The least common factor of 30 and 42 is the smallest number that is a factor of both of them and is 1.However, I suspect that you mean either:What is the highest common factor of 30 and 42?ie what is the highest number that is a factor of both 30 and 42: hcf = 6;What is the lowest common multiple of 30 and 42?ie that is the smallest number that is a multiple of both 30 and 42 lcm = 210.
49 and 30 have no common factor so there is no fraction for 49/30 with lower terms.
the lowest common multiple of 28 and 30 is 420.