- Dan Meyer – blog and many useful links (3 Act Math Videos, . . .)
- Graham Fletcher – 3 Act Math Videos for K-7 (check out the virtual filing cabinet as well)
- Open Middle – problems worth solving
- Aplusclick – reasoning and problem solving
- Math Pickle – problem solving (puzzles and games)
- Peter Liljedahl teacher resources
- Andrew Stadel – Estimation 180
- Carole Fullerton – K-7
- Sandra Ball – early learning
- Math Reggio
- High School – engaging activities
- Nrich – enriching mathematics K-12
- Galileo – inquiry classroom examples
- Chris Jordan photo gallery 1 and photo gallery 2
- University of Washington – TEDD math resources
- Futility Closet – math and science
- youcubed (K-12 resources from Jo Boaler)
- Which One Doesn’t Belong?
- Mathwire
- Don Stewart – blog with many links to activities
- Solve My Maths – blog – problems and puzzles
- Mathtop10 – problems K-7
- brainbashers puzzles
- Vi Hart (note: also search YouTube for other Vi Hart videos)
- Dreambox Learning – free interactive tools
- A look at mathematics in ‘The Simpsons’ tv show
- 101 questions (photos/videos to help students wonder/ask)