There is no greatest common multiple of any two numbers. They keep going forever.
The least common multiple of these two is 48.
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The least common multiple of the numbers 12, 16 and 15 is 240.
The least common multiple of 12 , 16 , 14 = 336
192
Every multiple of 48 is a multiple of both 16 and 12. There are an infinite number of them. multiples of 16, 16,32,48,64,etc. multiples of 12, 12,24,36,48,60,etc. common multiples of both 12 and 16 are the multiples of 48, 48,96,144,etc
Least Common Multiple (LCM) for 16 12 19 is 912.