What are the common factors of 16 and 30?

The factors of 16 are 1, 2, 4, 8, and 16.

The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.

The common factors are 1 and 2. Factors of 16: 2,4,8,16

Factors of 30: 2,3,5,6,10,15,30

Therefore 2 is a common factor of 16 and 30