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First, list the prime factorization of each number. If you need help with prime factorization, check out this
solver.
18: 2*3*3
27: 3*3*3
45: 3*3*5
Now highlight the unique factors. Remember, highlight the factors that occur most frequently
18:
2*3*3
27:
3*3*3
45: 3*3*
5
Now multiply all of the highlighted factors
2*3*3*3*5=270
So the LCM of 18, 27, and 45 is 270
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