The LCM is: 90
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The lowest common multiple of 15 and 18 is 90. 90 is equal to 6 x 15 and 5 x 18.
The lowest common multiple (LCM) is: 72
The Least Common Multiple of 18 and 21 is 126.
The lowest common multiple of 18 and 54 is 108. 54 times 2 equals 108, and 18 times 6 equals 108.
The LCM is: 36