What are the common multiples of 3 and 15?

Question

I really dont know what this means.

Answer 1

Common multiples are numbers that both

of the original numbers will divide evenly

into.

 

Example:  common multiples of 3 and 4:

First find the least common multiple, LCM, of 3 and 4:

3, 6, 9, 12, 15

4, 8, 12, 16

The LCM is 12.

Common multiples of 3 and 4 will be the multiples

of 12:

12, 24, 36, 48, ...

 

The least common multiple of 3 and 15 

is 15 since it is the smallest number that

both 3 and 15 divide into.

 

Since 3 goes into 15 ... 3(5)=15... then

any multiple of 15 will be a common multiple

of 3 and 15.

15, 30, 45, 60, 75, ...