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.
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The LCF of any set of numbers is 1.
The LCF is: 1
The LCF of 48 and 1,000 is 8.
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.