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This would be easier with the other number. The LCM of 4 and any odd number is their product. The LCM of 4 and any even number is either the other number or half the other number depending on whether it is a multiple of 4 or not.
The LCM of 4 and 20 is 20
The LCM is 60.
The LCM is: 24
The LCM of 4 and 18 is 36.
LCM(4, 5) = 20.
LCM(4, 1) = 4
The LCM is: 52
The LCM of 4 and 6 is 1212
LCM(12, 4) = 12
The LCM is 20.
The LCM is 196.
The LCM is 44.
The LCM is 2436.
The LCM is 140.
The LCM is 36.
The LCM is 108.
The LCM of 4, 5, and 8 is 40.