The LCM of 5 and 20 is 20. Since 20 is a multiple of 5, it is automatically the LCM of the pair.
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The least common multiple of 4 and 5 is 20. The least common multiple of 15 and 20 is 60. (Thus, the least common multiple of 4, 5, and 15 is 60.) Any multiple of 60 will also be a multiple of 4, 5, and 15.
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The least Common Multiple (LCM) of 5 and 11 is 55.55
The least common multiple (LCM) of 5 and 12 is 60.
Least Common Multiple (LCM) for 2 5 is 10