What is the first 5 common multiples of 15 and 25

You can first find the missing factors of each number to find the lcm
So  and 
In order to make them equal, Multiply 15 by 5 and 25 by 3 so that both of them are  which equals 75.
After that you can just multiply each by 2, 3, 4, and 5 because all the other common multiples are multiples of 75. You get
150, 225, 300, 375, as well as 75
So:
75
150
225
300
375