The lowest common denominator of any set of whole numbers is 1
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lowest common denominator of 4/5 and 7/15 would be 15 4/5=12/15
LCD means lowest (or least) common denominator, and that implies there must be at least two fractions involved for something to be common to both of them. There is, therefore, no sensible answer to this question.
The GCF is 1. The LCM is 10. The LCD is related to the LCM.
15
The LCD of 3/6 and 4/5 is 30