A website dedicated to providing thought provoking puzzles for math teachers and students alike. There are no answers provided as there are many different, correct ways of choosing which one doesn’t belong. Enjoy!

We develop math games and curriculum, including tons of free lesson plans that we give away here. We train teachers and produce professional learning materials. And we write puzzles, produce math-art shows, and do whatever we can to show people how playful, beautiful, and life-changing mathematics can be.

One of our favorite math centers and activities is definitely the Find the Error math activity that requires the students to analyze example work to find and explain the error made by the “student”. Simply enter your email and receive this free downloadable tasks.