40 is not the LCM of 9 and 4.
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The LCM stands for the lowest common multiple as for example the LCM of 3 and 5 is 15
The concept of LCM is not applicable to fractions. This is because all numbers are evenly divisible by all non-zero numbers and all numbers are multiples of all non-zero numbers.
The LCM is never less than the greatest number in the set. The LCM of 4 and 9 is 36.
Example: 3x4y2 and 9x3y5 Treat the whole numbers normally. The LCM of 3 and 9 is 9. Choose the highest value of the variables. In this case, the LCM is 9x4y5
There is no LCM for less than two numbers. LCM is the multiple of the highest power of prime factors in two or more numbers. Example: LCM of 9, 15, and 25 is 225, which is the multiple of the highest power of prime factors in 9, 15, and 25 (32 x 52).