Open-ended topics for students in lower-level math classes to research

List of fun things to do for the first 5-10 minutes of class

Student comments on the use of puzzles and projects in my Summer '14 Calculus II class

Student comments on the use of projects in my Fall '15 Ideas in Math class

Extra credit problems for Calculus II: PDF | TeX

Common mistakes students in Calculus II make: PDF | TeX

Links:

Cool Math and Cool Math Games! Educational and Fun! (Seriously!)

Dr. James Tanton's resources for teaching math

MAA's Math Fun Facts

100 Calculus Projects in Maple

http://mathmistakes.info/

Essay Roo: Tons of great links!!

Academized.com Math Resources

Dr. Vogel's Gallery of Calculus Pathologies