12 and 24 have an LCM of 24. There are many other possibilities.
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4 and 24
At least another number is needed in order to find the LCM
The word "least" is a superlative. That means that there can only be one such number. So you cannot have least common multiples of 24 and 28.LCM(24, 28) = 168.
The LCM is 24.
168 is the LCM of 14, 24, and 28. It is the smallest number that they all divide into equally.