The first three common multiples are 18, 36, and 54.
The first three multiples of 3 are 3, 6, 9 The first three multiples of 9 are 9, 18, 27 As the lowest common multiples of 3 and 9 is 9, the common multiples of 3 and 9 are the multiples of 9, thus: The first three common multiples of 3 and 9 are 9, 18, 27
The first three multiples of 9 are 9, 18 and 27. For them to be common, they need to be compared to another set of factors.
First three common multiples of 2 and 6 are 6, 12 and 18.
18, 36, 54
18, 36, 54.
6, 12, 18
6, 12 and 18
54, 108, and 162.
90, 180, 270
They are: 180, 360 and 540
9, 18, 27