These activities are entirely optional! You are not in anyway required to do them. Don’t do them if you feel that you should; do do them if you love math and/or if you need to stretch your math muscles and/or if you are trying to build up your skill level.
If you do do anything here, do let me know! If it’s fun, helpful, or engaging, let others know, too!
Illuminations Geometry Interactives
NRICH Geometry and Measurement
Challenge Problems (see menu bar for archive of other years)
Crux Mathematicorum Challenge Problems (scroll down and choose an issue – use the Table of Contents to find and explore the problems)
Brain Bashers Optical Illusions
Ohio State University Non-Routine Problems
Card Tricks (can you figure out the trick??)
A big thank you to the Grand Man himself, Peter Liljedahl, SFU Math Prof extraordinaire, for all of these extension activities.
MACC-sters, if you find other good sites or resources, please let me know!