72, 144 and 216
The first three common multiples of 8 and 12 are 24, 48, and 72.
8 16 24
8, 16, 24
LCM is 24, but 48 and 72 are also multiples
24, 48, 72
24, 240 and 2400
24, 48, 72
They are: 24 48 and 72
Every multiple of 24 is a common multiple of 2, 6 & 8. Where did "three" come from?
The first three common multiples of 6 and 8 are the first three multiples of the least common multiple of 6 and 8. 6 = 2 x 3 and 8 = 2 x 2 x 2. Therefore, the LCM of 6 and 8 is 2 x 2 x 2 x 3 or 24. The first three multiples of 24 are 24, 48 and 72.
There are infinitely many common multiples of 6 and 8. The least common multiple of them is 24. After that, all of the multiples of 24 (i.e., 48, 72, 96, etc.) are the common multiples of 6 and 8.
72, 144, 216