Calculate Least Common Multiplier LCM math

How to find LCM? To find the Least Common Multiplier of 2 and 5, you need to list multiples of each number. After you find the smallest number that matches both lists, you're done. What is a multiple? It's when you multiply one number by 1,2,3,4, etc. For example, multiples of 2 are 2,4,6,8,10... and multiples of 5 are 5,10,15... If you notice, lowest common number is 10. The answer is 10. If there are no common numbers, the answer is always "1".
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