Hello,

I'm looking to make a database of some math problems. I'm a secondary teacher and LOVE interesting problems to add to my bank. I'm looking for all kinds of problems, not just Algebra. Anything 6-12.

Here are some of my favorites:

Wine/water mixing problem - Wikipedia, the free encyclopedia

The String Around the Earth Problem .........

Connected Mathematics 2

Basically, problems that have interesting/surprising results, multiple ways to solve them, etc.

What are some of your favorites?