First find the prime factors
38 = 2 X 19
18 = 2 X 3 X 3
Now multiply together the prime factors, using those that are duplicated in both numbers only once.
2 X 19 X 3 X 3 = 342
342 is the answer.
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You need at least two numbers to find an LCM. If that's 38 and 18, the LCM is 342.
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