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20, although if you reduced 15/20 to 3/4, the common denominator would be 4.

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โˆ™ 2015-03-26 11:05:01
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Q: What is the common denominator of 3 over 4 and 15 over 20?
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A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.


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