I and trying to combine 2 cells using &" "& option in a formla

For example

=Al&" / "&B1

I am trying to make it look like this: 51/36

The first number is entered in so that's not the problem. The 2nd number is from a formula so my combined cell is looking like this: 51/36.0004

How do I get rid of the .0004??

I tried making the cell only 2 characters. I also tried a custom format of 00/00 but nothing seems to work to get my cell to look like 51/36.

Any help I would be grateful.

James