SQL & PL/SQL

DB Version:10g Release 2

I know that the Subject line is a bit self contradicting. But here is my requirement. I have a VARCHAR column which stores numbers, but is there any way i could sort values in this column numerically (Ascending)

CREATE TABLE keith
(mykey varchar2(3));

   INSERT INTO keith VALUES ('97');
   INSERT INTO keith VALUES ('98');
   INSERT INTO keith VALUES ('99');
   INSERT INTO keith VALUES ('100');
   INSERT INTO keith VALUES ('101');

Since Oracle is calculating the ASCII values for this VARCHAR column, I can't sort the values numerically(understandably) . This is what i get when i try to sort the column mykey in ASC order

  
   SQL> SELECT * FROM KEITH ORDER BY MYKEY ASC;
   
   MYK
   ---
   100
   101
   97
   98
   99
   

Is there any way i could sort the values Numerically for this VARCHAR column?