This is an ongoing collection of instructables that I think could be used in middle and high school math classes. Some as lessons. Others as puzzles or games to challenge student thinking.
I love trying to show students that math is an exploration as much as it is a goal. Too many students think math is only about the correct answer. I like to think it is as much about the journey. How you arrive at an answer can be elegant, beautiful, or wacky crazy.