What data type should I use???

I am trying to divide two numbers in a user defined function that returns a decimal(3,3)
example. 2/4 should have a result of .500
All i'm getting back is .000.
I tried using CONVERT(decimal(3,3),(2/4)) to get the result I am after.
I get the same result: 0.000


Thanks

Never mind I got it
You need to declare one of the numbers in the division statement as a decimal
select ((CAST(2 AS DECIMAL(3,2))/4))