It is 9 derived as:
Prime Factors of 36: 2x2x3x3
Prime Factors of 45: 5x3x3
Prime Factors of 54: 2x3x3x3
The common prime factors of all the three numbers are 3x3 = 9
To check you answer:
1. Divide all the three numbers by 9 and they shall be perfectly divisible
2. Try and divide non common factors of each number by other two, it would not be perfectly divisible (i.e. Try and divide 54 by 5)
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The least common multiple of the numbers 28, 36 and 45 is 1,260.
There is an infinite number of common multiples for 36 and 45. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder). However, the least or lowest common multiple of 36 and 45 is 180.
Least common multiple for 36 and 60 and 135 is 540.
The least common multiple of 45 , 3 , 5 = 45
The least common multiple of 915 , 45 = 2,745