60, 120, 180 and so on.
It is: 60
They are any multiples of 30
The multiples of 20 are 20, 40, 60, 80, 100, 120... The multiples of 30 are 30, 60, 90, 120, 150... The multiples of 15 are 15, 30, 45, 60, 75, 90, 105, 120, 135... The common multiples of 20, 30, and 15 are 60, 120, 180, 240...
60 and 120
60 and 120
Multiples of 30 include 30, 60 and 90. For them to be common, they need to be compared to another set of multiples.
Common multiples include any multiple of 60.
The LCM is 60
Do you mean common multiples? If so, then 30, 60, 90 etc. are common multiples of 30 and 5. If you mean multiples of 5 and factors of 30, that's 5, 15 and 30.
The common multiples of 12 and 30 are numbers that are divisible by both 12 and 30. To find the common multiples, you can list out the multiples of each number and find the numbers that appear in both lists. The common multiples of 12 and 30 are 60, 120, 180, and so on, as these numbers can be evenly divided by both 12 and 30.
20, 40, 60 and so on. 30, 60, 90 and so on. Common multiples include 60, 120, 180 and so on.
The LCM of 20 and 30 is 60. The multiples of 20 are 20, 40, 60, and so on. The multiples of 30 are 30, 60, and so on. So teh LCM of 20 and 30 is 60.