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The LCM always be the largest of the given numbers or a multiple of the largest number.

The largest number given is 45, but 18 will not divide evenly into 45. The next multiple of 45 is 90 (2 x 45). Since 90 is divisible by both 5 and 18, then 90 is the LCM.

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Q: What is the lcm of 5 18 and 45?
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