Question

What is 31/10 as a whole number

Answer 1

Yes it is 3 1/10 
31 goes into 10 3 times with 1 left over. 

Answer 2

To answer this, you simply need to divide 31 by 10. 
Remembering that 10/10 is 1,
There is 3.
But what about this remaining 1/10?
You could write this as 3.1, or as a mixed number, 3 1/10
That mixed number is 3 and 1/10, the computer doesn't always make that clear.