The LCM is: 378
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The LCM is 189.
The LCM of 15, 21 and 27 is 945.
The LCM (Least Common Multiply) of 21 and 27 is: 189 GCD: 3LCM: 189189
Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42Multiples of 14: 14, 28, 42Multipled of 21: 21, 4242 is lowest number common in all three hence LCM is 42.
The LCM seems to be 756.