Seven Sites to build rich mathematical discussions

We are often looking for ideas to have students work purposefully for short or longer bursts.

This post has a collection of  seven sites that you and your students could work on independently, in pairs, small groups or as whole class 


Would you rather ? 

Would you rather began as a way for John Stevens to start his classes. It has evolved into a large collection of graded problems that ask students to choose an option and justify their choice using maths. 


Visual Patterns.org

A collection of over 400 patterns to begin rich discussions which can lead to a generalisation for the pattern. Collated by Fawn Nguyen, On the sidebar of her blog you will find links to others sites.


Open Middle

A huge collection of  problems sorted by topic and grade level. Open middle problems start and finish at the same point but offer multiple pathways through. Put together by  Nanette Johnson and Robert Kaplinsky


Estimation 180

This site is curated by Andrew Stadel, a teacher and Mathematics Coach in California. He began by creating 180 different estimation challenges for his students so they could engage in rich mathematical conversations and learning.



This site was inspired by the MTBOS, and contains many visuals which allow all students to take part. Use the ones on the site or create your own to develop rich discussions in class. or build them into Mathwalks around  the school and community.
Steve Wybourney calls them imposter sets: see how he uses this concept here 




The team at Gapminder visited 264 families in 50 countries and collected 30,000 photos showing how people live. Select income levels, countries and regions to compare homes from the same part of the world then look behind the data and look for possible reasons for the variation.


This is a weekly feature in the New York Times, put together in collaboration with the American Stats Association Students are invited to analyze and interpret graphs first by noticing and wondering, and then by creating a catchy headline and considering what impact this data might have on them and their communities.
See more about how you can use these graphs and the live discussion sessions here
Watch the on demand webinar showing you how to get the best out of this site 


Have a site to share - add in the comments below

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