# Free sources of nonroutine problems

Here are some I've found. If you want more, try Googling "math problem of the month" or "math problem of the week."

- Nick's Mathematical Puzzles
- Purdue Problem of the Week
- Mr. P
- Inside Mathematics
- MOEMS
- MOEMS on the Wayback Machine
- Math Goodies
- National Council of Teachers of Mathematics
- MATHCOUNTS
- Pierce School
- SigmaCamp
- Bilkent University
- University of Colorado
- California State University, Fresno
- Math Central
- Southeast Missouri State University
- Hofstra University
- Mu Prime Math - Challenge Problems
- Daily Math Pro
- Math for fun and glory - Khan Academy