Since 45 is a multiple of 3, it is automatically the LCM.
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The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
The least common multiple of 45 , 3 , 5 = 45
The least common multiple of 915 , 45 = 2,745
45 is a multiple of both 15 and itself, so 45 is the least common multiple of 15 and 45.
The Least Common Multiple (LCM) for 45 25 is 225.