T-SQL that works, but needs a facelift!

Techies--

This extracts what I need, but looks very late '80's. To make a long story short, I have table t1 with a real identifier I've dubbed as i . In table t2  I have comparable b,c values in both tables--although-- in different data types. I've made them uniform, then concatenated them together to pull back the subset I want. 

Is there a better way to do this?

select i,
          b,
          c
  from t1
   where ( cast(b as varchar(10)) + cast(c as varchar(10)) ) IN
     (select
         cast(bb as varchar(10)) + cast(cc as varchar(10))
        from t2
     )