The lowest common multiple of 5 and 9 is 45
The first 5 common multiples are the first 5 multiples of their lowest common multiple (LCM) LCM(9, 10) = 90 → first 5 common multiples are 90, 180, 270, 360, 450.
The first 5 multiples of 9 are 9, 18, 27, 36, and 45. For them to be common, they need to be compared to another set of multiples.
The LCM of 5 & 9 is... 45
45
You can't have common multiples if they have nothing to be in common with however the first 3 multiples of 9 are 9,18 and 27 Think of just your times tables when finding out Multiples to find the first 5 multiples just count by 9's until you have said 5 numbers and Bingo
It is: 45
45 and 90
315
The Least Common Multiple (LCM) for 9 5 99 is 495.
Common multiples of 9 and 10 are all of the multiples of 90.
There are an infinite number of common multiples of 5 and 9. The lowest of these (or least common multiple) is 45.