The LCM is: 270
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54 = 6 x 9. 30 = 6 x 5, so 6 x 9 x 5 = 270 is the LCM
Multiples of 18: {18, 36, 54, 72, 90...}Multiples of 30: {30, 60, 90, 120, 150...}Therefore the LCM is 90.
The LCM is: 54
The LCM is: 270
The LCM is 594.