2, 4, 6
Multiples of 1 include 1, 2 and 3. For them to be common, they need to be compared to another set of multiples.
Get the first common multiple, then multiply that by 0, 1, 2, 3, 4, etc. to get additional common multiples.
There are only 2 common factors; 1 and 2. You likely mean what are the first 6 common multiples, for which the first six multiples of 8 are the answer. 8,16,24,32,40 and 48.
2, 4, 6
The first three multiples of 2 are 2, 4, 6. For them to be common, they need to be compared to another set of multiples.
The first 2 common multiples of 4 and 12 are 12 and 24.
12, 24, and 36
4, 8 and 12 are the first 3 common multiples of 2 and 4
6, 12, 18
the first two common multiples of 15,27 are 135,270
1 and 2 are common factors. 84 and 168 are common multiples.
The first two common multiples of 235 is 5 and 47.