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If the question is "What is the greatest common factor of 168 and 180?" then:

The prime factors of 168 = 2*2*2*3*7

The prime factors of 180 = 2*2*3*3*5

So the greatest common divisor = 2*2*3 = 12

If 168 and 180 are denominators and we want to find a number both divide into, we are looking for the LEAST common factor:

2*2*2*3*3*5*7 = 2520

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Q: What is the greatest common denominator of 168 and 180?
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