Free math graphing tool Desmos released Polygraph, a collection of four new classroom activities focused on a game involving lines, parabolas, rational functions and hexagons. It works like Guess Who, where one partner picks a graph and another asks yes/no questions to figure out what the graph is!

This site looks like it could provide some good material for looking at real data - I signed up for an account; this is an email newsletter I received

interactive charts and downloadable datasets to work with real-world problems. can sign in using google account, and generate a code for your class to join you.

This GoogleSheets add-on was just released - seems like you might be the people who would appreciate it...

Dreambox just added grades 6-8

free this week - grab it if you have an iPad (or iPhone)

Function Carnival helps students get a handle on confusing graphs lessons and helps them experiment to resolve misunderstandings. Through video, graphing, and replaying graphs as animations students can begin to construct their own understanding of what these graphs really mean.

Article about this book: http://www.moebiusnoodles.com/

an easy way to provide student with a set of manipulatives, and describes how they used it for creating screencasts to demonstrate thinking.

Word problems with images - would be a good writing activity or bellwork type thing...

Brilliant is one way to keep your science and math whiz kids regularly engaged and challenged. Students receive challenge problems each week that they complete and then compare against their peers all over the world. They can see where they match up against others based on country and age, and share strategies with others students. The site also hosts competitions involving game theory, writing algorithms, and other fun shenanigans.

a creative introduction to imaginary numbers...