It is not possible to give a sensible answer to this question. 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!
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Since 63 is a multiple of 9, it is automatically the LCM.
The LCM of 63 and 135 is 945.
The least common multiple of 54 , 63 = 378
Until that other number shows up, the LCM is 63.
45 + 45 = 90 and just 90 a lone = 90 so the LCM is 90