You need to have at least two numbers to find an LCF, but I'll save you the trouble. The LCF of any two numbers is one. It's usually more productive to find the GCF or the LCM.
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The LCF of 48 and 1,000 is 8.
The LCF of any set of numbers is 1.
LCF? lowest common factor? Don't you mean highest common factor? The lcf usually has no meaning: it is 1
The lcf (lowest common factor) of 6 and 8 is 1.
Since the CFs of neither match, you have to multiply the two numbers together. The answer you get is the LCF. You do the math.