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If you mean what is the Least Common Multiple (LCM) of 3, 7, 8, and 6 because they are denominators of fractions that you want to add, then here's how I go about doing it: First, 6 is a multiple of 3, so we don't have to worry about 3. Next, 8 = 2*2*2, and 6 = 3*2; they have one 2 & 1 in common, so you take the common factor and multiply by the other factors: 3*2*2*2 = 24. Then find the LCM of 24 and 7. The only common factor between them is 1, so the answer is 7 * 24 = 168.

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Q: What is the least common denominator of 3 7 8 6?
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