Computer Science Unplugged 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...