What is 31/10 as a whole number

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.

Yes it is 3 1/10

31 goes into 10 3 times with 1 left over.