Brain Teasers and Puzzles

A box for your workings out:

Hint: Does reversing the numbers help?

Answer: 891.

If we first make sure each number has the same number of digits:

   302 202 102 002 991 ==?==

and now reverse the digits in each number:

   203 202 201 200 199 ==?==

We can see that the next number should be 198, which is 891 when reversed.