The LCM of 3, 7, and 15 is 105
120
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35 is not the LCM of 3 and 5, 15 is. LCM means Lowest Common Factor. To find the LCM of 3 and 15 you have to list the multiples: 3, 6, 9, 12, 15, 18, 21 etc. 5, 10, 15, 20, 25, etc. The LCM is the least common number in both the lists, which is 15.
As for example the LCM of 15 and 20 is 60
The Least Common Multiple (LCM) for 7 15 20 is 420.
The LCM is 60.
The LCM is 140.
The LCM is 1140.
The LCM is 240.
The LCM is 120.
The LCM is 60.
The LCM is 840.
LCM(15, 20, 30) = 60
The LCM of 15 and 20 is 60. The GCF is 5.
The LCM of 15, 9, 7 is 315.
The LCM is 105.