Hash Functions By Hand

How do I hash data by hand? Bitwise, strings, integers, any tricks you know of to hash numbers quickly or easily with a paper and pen?

iit, we circumvent programming.

>>1-2
Read these, for example, and try to apply what you learn.
http://burtleburtle.net/bob/hash/doobs.html
http://www.azillionmonkeys.com/qed/hash.html
http://unixwiz.net/techtips/iguide-crypto-hashes.html
And here's a short version of the last one:
What's inside a hash?  The first answer is "it depends on the kind of hash", but the second answer usually starts with "a lot of math."

>>3
They're called bitwise operations for a reason.  (Why not just add 9 and 4?)