This cannot be determined because the common multiples of any two or more numbers are infinite.
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936. All numbers divisible by 12 and 13 are multiplies of the lowest common multiple of 12 and 13 which is 156. 999 ÷ 156 = 621/52 ⇒ greatest multiple of 156 not bigger than 999 is 6 x 156 = 936.
Since the list of numbers is infinite, there is no such thing as the Greatest Common Multiple.
12 is a multiple of 6 and 1 is a factor of 12 and so 12+1 = 13
The LCM of 12 and 13 is 156.
There is no "greatest common multiple" for any pair of numbers. If you meant greatest common factor, the answer is 3.