You need at least two numbers to find an LCM. If that's 21 and 30, the LCM is 210.
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LCM(7, 10, 3) = 210
2130 millimeters = about 7 feet (6.98818898 feet).
The LCM is: 10The LCM is 10.
The LCM of these numbers is 340. LCM is Least Common Multiple.
You need at least two numbers to find an LCM.