Connie - If I can get you to change your folder numbering scheme a bit I can make this work with just two activities; an Assign Token Values activity and a Token Calculator activity.  Here is a screen shot of the workflow;

And here is a screen shot of the results;

The details for the Assign Token Values activity - Create a numeric token called 'SignificantDigits' based on the retrieved field value Roll#1;

Details of the Token Calculator - Create two calculated tokens, one called 'LowRange' and the other called 'HighRange'.  'LowRange' is 'SignificantDigits' * 10000, and HighRange is 'LowRange' + 9999;

The final routing info would be as follows;

\Roll Files\_Rolls %(TokenCalculator_LowRange#"D6"#) to %(TokenCalculator_HighRange#"D6"#)\Roll %([RetrieveFieldValues_Roll #1]#"D6"#)

Note: If you need to keep the subfolder numbering system that you described in your post then the only ways I could see to do that would require some type of iterative loop to determine the appropriate subfolder, or perhaps a script activity with some type of Select Case structure?