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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.
The Least Common Multiple (LCM) of 32 and 42 is 672.
672
The Greatest Common Factor of 28, 42, 63: 7
Yes, 3 a common factor of 9 18 and 42