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...
Only one can be least; that's 15. Other common multiples include 30 and 45.
Multiples of 6 are 6, 12, 18, 24, 30, 36, etc. Multiples of 15 are 15, 30, 45, 60, 75, 90, etc. The Least Common Multiple (LCM) of 6 and 15 is 30.
Multiples of 10 and 15 include 30, 60, 90, 120, 150, etc. The least common multiple (LCM) of 10 and 15 is 30.
The least common multiple is 30. The greatest common factor is 3.
Multiples of 15 include 15, 30 and 45. For them to be common, they need to be compared to another set of multiples.
The LCM of 5, 10, and 15 is 30. The multiples of 5 are 5, 10, 15, 20, 25, 30, and so on. The multiples of 10 are 10, 20, 30, and so on. The multiples of 15 are 15, 30, and so on. So the LCM of 5, 10, and 15 is 30.
There are infinite common multiples for a set of numbers. So it is not possible to write down all the common multiples. Some common multiples of 15, 30 and 45 are 90, 180, 270, 360,... There is another way to find common multiples: Write the multiples of LCM(15, 30, 45). Actually the common multiples of a set of numbers are the multiples of their LCM. LCM of 15, 30 and 45 is 90. And the multiples of 90 are 90, 180, 270, 360, 450, 540,... which are the common multiples of 15, 30 and 45.
The LCM is 15. The rest are 30, 45, 60, 75 and 90.
30 is a multiple of 30 and 15.
15/30/45
You can't find the Lowest Common Multiple (LCM) of only one number. You need at least two numbers to find the LCM.