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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.

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13y ago

What else can I help you with?