Both 180 and 540 are common multiples of 5, 9 and 12. That is to say they are in the 5-times table, the 9-times table and the 12-times table.
But the L in LCM stands for Least. So, since 180 is less than 540, the LCM cannot be 540. You may like to check, for yourself, that no number smaller than 180 is in all the three tables.
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Because it's the least common multiple. 180 and 540 are both common multiples, but 180 is less than 540.
180
LCM(Least Common Multiple) as the name suggests is the common multiple of two numbers. Thus, LCM of a single number cannot be found out.
It is 180 which is also the LCM
The LCM for 9, 5, 4, is: 180
The LCM is: 180