There is really no such thing as a "highest common multiple". Once you find the least common multiple of a set of numbers, you can keep adding the LCM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a greatest multiple.
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Least common multiple for 36 and 60 and 135 is 540.
The lowest common multiple is 90 .There is no highest one. If you think you've found the highest one,just add 90 to it, and you'll have a higher common multiple. You cancontinue doing that forever.
HCF(30, 36, 42) = 6 LCM(30, 36, 42) = 1260
GCF requires 2 numbers to compute. "What do you have in common?" begs the question "In common with what?" It is the same thing here.◄
Any multiple of 30 is also a multiple of 15.