LCF? lowest common factor? Don't you mean highest common factor? The lcf usually has no meaning: it is 1
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The lowest term of 3/9 is 1/3. Basically find the least common factor (LCF) of 3 and 9 and divide both the numerator and the denominator by LCF. Another example is 2/4. LCF = 2 (2/2)/(4/2) = 1/2 1/2 is the lowest term of 2/4.
The LCF of 48 and 1,000 is 8.
The LCF of any set of numbers 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.