What is the common factors of 50?

That would depend upon the other number(s) with which the factors are common.

The factors of 50 are 1, 2, 5, 10, 25 & 50, so the common factors of 50 will be 1 or more of these dependent upon the other number(s).

For example:

• The common factor of 50 and 3 is: 1
• The common factors of 50 and 10 are: 1, 2, 5, 10
• The common factors of 50 and 25 are: 1, 5, 25
• The common factors of 50 and 210 are 1, 2, 5, 10