The LCM of 18, 27 and 36 is 108. LCM is basically the lowest number that all the numbers go into. So the lowest number that all three go into is 108.
Here is one method to find the LCM:
Divide all three numbers until they all reach 1.
9 | 18, 27, 36
2 | 2, 3, 4
2 | 1, 3, 2
3 | 1, 3, 1
| 1, 1, 1
So the numbers on the left panel are 9, 2, 2 and 3. When you multiply them you get 108.
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The least common multiple of 9, 18, and 27 is 54.
The LCM of 18, 27, and 45 is 270
The least common multiple of 18, 27, and 35 is 1890, which is the multiple of the highest power of prime factors in the given numbers (2 x 3^3 x 5 x 7).
The common multiples of 18 and 27 are 54, 108, 162, 216, and so on. Each is a multiple of 54, which is the least common multiple of 18 and 27. There is an infinite number of common multiples for 18 and 27. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
The Least Common Multiple (LCM) for 27 45 10 is 270.