I'm sorry, but there is really no such thing as "The World's Hardest Math Problem" however there are very hard math problems that can be found online. The hardest math problem
http://wiki.answers.com/Q/What_is_the_worlds_harde...

One of the hardest math questions is "Every even number greater than two is
http://www.chacha.com/question/whatittheworlds...

The Traveling Salesman Problem is an NPcomplete problem: one of the hardest classes of problems.
http://www.kgbanswers.com/whatisthehardestmath...

There is a famous theorem called Godel's Theorem which says that there is no hardest math problem. Specifically, it says that given any computer program C which solves math problems
http://www.quora.com/Whatisthehardestmathprob...
