Least Common Multiple (LCM) for 2 5 is 10
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The least common multiple of 5 , 7 , 2 = 70
The least common multiple of 3 and 5 is 15. This, however is not a multiple of 2 so we must find the next common multiple of 3 and 5. This is 30. Since 30 is also a multiple of 2, 30 is therefore the least common multiple of 3, 5 and 2.
The word "least" is a superlative. What that means is that there cam be only one such number. Therefore 2, 3 and 5 have only one least common multiple, not least common multiples! LCM(2, 3, 5) = 30.
The least common multiple of 5 and 10 is 10. Since 10 is a multiple of 5, it is automatically the LCM.
The least Common Multiple (LCM) of 5 and 11 is 55.55