YouCubed - Jo Boaler
https://www.youcubed.org/
Jo Boaler is an education author and Professor of Mathematics who is at the frontier of math education. Boaler is pushing to reform mathematics to be more accessible to all. Her website "YouCubed" has many tasks and online games that are useful for students.
This is a video to show your students why it's important to make mistakes. Making mistakes and productive struggle are what give students the skills they need to face any challenge.