[Computer Science Unplugged][1] offers plenty of possibilities:

> CS Unplugged is a collection of free
> learning activities that teach
> Computer Science through engaging
> games and puzzles that use cards,
> string, crayons and lots of running
> around.
> 
> The activities introduce students to
> underlying concepts such as binary
> numbers, algorithms and data
> compression, separated from the
> distractions and technical details we
> usually see with computers.

Of course, some might argue that Computer Science is not a subset of Mathematics...


  [1]: http://csunplugged.org/