60 and 120
The two common multiples of three and five are: 15 and 30 ^-^
30
60 and 120
The LCM is: 30
Since 30 is a multiple of 6, all multiples of 30 are common.
A single number cannot have common multiples, until you are comparing it with one or more other numbers.
One common multiple of 15 and 30 is 60. Want another? 120
15 and 30
They are: 30 and 60
30 and 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.
To find the common multiples of 16 and 30, first find the LCM: The prime factorization of 16 is 2*2*2*2 The prime factorization of 30 is 2*3*5 So the LCM is 16*30 / 2 = 240. All of the common multiples of 16 and 30 will be multiples of 240, so they are 240, 480, 720, 960, 1200, etc. There is an infinite number of common multiples for 16 and 30. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).