84
LCM of 4 14 and 3 is 84
You do not have LCMs of fractions or decimals. Because if you did so, any number could be an LCM. Eg 3 could be an LCM with multiple 3/4.7 = 0.6383 and 3/14 = 0.2143 (to 4 dp)
The LCM is 140.
The LCM is 196.
The LCM of 14, 3 and 2 is 42
For 18, 14, 4 the LCM is: 252
The LCM is 56.
The LCM is 140.
LCM(4, 21, 14) = 84
The LCM is 42.
The LCM is 210.
For 14, 8, 7, 4 the LCM is: 56