1, 2, and 3 for both 16 and 30.
The numbers that go into 30 are1, 2, 3, 5, 30, 15, 10, 6
No.
No, it does not.
No.
No.
Not evenly.
No. 42 is not evenly divisible by 16.
No. 16 is not evenly divisible by three.
No. 81 is not evenly divisible by 16.
No. 25 is not evenly divisible by 16.
No. 80 is not evenly divisible by 30.
No. 30 is not evenly divisible by four.