They're infinite. You're probably looking for the greatest common factor or least common multiple.
Multiples of 6 are 6, 12, 18, 24, 30, 36... Multiples of 10 are 10, 20, 30, 40... The LCM of 6 and 10 is 30. The greatest common multiple could go into infinity.
The Greatest Common Factor of 30, 40: 10
49. And35
It is 120
The Greatest Common Factor of 30, 35, 40 is 5.
The multiples of 4 up to 30 are: 4, 8, 12, 16, 20, 24, 28.
The greatest common factor is 10.
20 30 40
10!
40
There is an infinite number of common multiples for 30 40 and 50. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder). However, the least or lowest common multiple (LCM) of 30 40 and 50 is 600.
This cannot be answered because the common multiples of any two numbers are infinite.