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30 = 2*3 *5
18 = 2*3*3
The LCM of 30 and 18 = 2*3*3*5 = 90 (<-- For 2, I have only one choice. For 3, I pick the higher number 3*3. For 5, there is only one choice.)
Reasoning:
The multiples of 30 are 30, 60, 90, 120, ...
The multiples of 18 are 18, 36, 54, 72, 90, 108, ...
The smallest common factor of the two integers is 90.
Q.E.D.
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The Least Common Multiple of 30 18 is 90.
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What are LCM 30 and 18?
The LCM is 90.
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What is the LCM of 18 30 and 50?
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What is the LCM of 18 30 and 10?
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What are the greatest common factor and least common multiple of 18 and 30?
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What is the LCM of 30 18 100?
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