Find this post at your room's blog. Leave a comment there or at voicethread.
Here are the posters from today's math congress. I hope you will go to voicethread and leave a comment. We have a class account. firstname.lastname@example.org
and the password is room## where you have math. In your comment talk about the strategy and what you understand. You need to pick a picture to talk about at voicethead, then comment.
Or you can comment on these slides from today's class.
Here are the slides from today.