In February of 2015 a twitter conversation led to the creation of #probchat, a twitter chat about solving problems. Each week we would talk about a different problem and how students may approach it. The problems each week came from different sources around the internet in order to demonstrate the vast array of interesting problems available across the web. It was a bit of a struggle finding problems each week, but I think I was able to find a collection of problems with a number of good characteristics. It seemed like it would be a good idea to have all of those problems referenced on the web, so this post.
#probchat Problem Characteristics
Each problem was one I found somewhere on the internet (except for Basketball Practice). After looking at all of them, it seems that the problems I settled on each week had the following characteristics:
 Required little more than elementary math knowledge
 Even people with advanced math knowledge would not find any immediate and obvious solution strategies
 Had a realistic context or story which inspired a genuine desire for a mathematical solution
 Had a context or story simple enough to be easily read on twitter
 Could be approached with different problem solving strategies
Is This The End?
For now #probchat is on hiatus. Having a new job and a new baby has made it hard to have free time in the evenings, and the slowchats that I tried in November never really seemed to get much traction. After the NCTM conference in San Francisco I may see if I can give it the time it deserves, or see if I can develop a format that garners interest and isn’t demanding. If you have any ideas about how it could successful again, let me know in the comments!
#Probchat Dates:
Feb 15, 2015  Feb 22, 2015  Mar 1, 2015  Mar 8, 2015  Mar 22, 2015  Mar 29, 2015  Apr 5, 2015  Apr 12, 2015  Apr 19, 2015  Apr 19, 2015  Apr 26, 2015  May 3, 2015  May 10, 2015  May 17, 2015  May 24, 2015  Jun 7, 2015  Jun 14, 2015  Jun 21, 2015  Sep 6, 2015  Sep 13, 2015  Sep 20, 2015  Sep 27, 2015  Oct 4, 2015  Oct 18, 2015  Oct 25, 2015  Nov 1, 2015  Nov 8, 2015  Nov 15, 2015  Nov 22, 2015  Nov 29, 2015
#Probchat Problems:
A Pound Of Valentines Chocolate – February 15, 2015 

Relive the chat: Storify  Original Problem: mathforum.org 
Fair Share – February 22, 2015 

Relive the chat: Storify  Original Problem: nrich.maths.org 
Rooster Geese and Duck Prices – March 1, 2015 

Relive the chat: Storify  Original Problem: ohiorc.org 
Gold Rush – March 8, 2015 

Original Problem: map.mathshell.org  
Bernardo and Silvia Play A Game – March 22, 2015 

Relive the chat: Storify  Original Problem: illustrativemathematics.org 
Tyler the Tiler – March 29, 2015 

Relive the chat: Storify  Original Problem: cemc.waterloo.ca 
Do You Notice SumThing? – April 5, 2015 

Relive the chat: Storify  Original Problem: illuminations.nctm.org 
Sharing Pairs – April 12, 2015 

Relive the chat: Storify  Original Problem: reflectionsinthewhy.wordpress.com 
Number Bracelets – April 19, 2015 

Relive the chat: Storify  Original Problem: storify.com 
Firefighters Problem – April 19, 2015 

Relive the chat: Storify  Original Problem: storify.com 
Good Work If You Can Get It – April 26, 2015 

Relive the chat: Storify  Original Problem: nrich.maths.org 
The Unresolved Wager – May 3, 2015 

Relive the chat: Storify  Original Problem: peterliljedahl.com 
The Postage Stamp Problem – May 10, 2015 

Relive the chat: Storify  Original Problem: mathpractices.edc.org 
New Years Resolutions – May 17, 2015 

Relive the chat: Storify  Original Problem: mathcounts.org 
Two For You – May 24, 2015 

Original Problem: denissheeran.com  
Set List – June 7, 2015 

Relive the chat: Storify  Original Problem: artofproblemsolving.com 
Stacking Coins – June 14, 2015 

Relive the chat: Storify  Original Problem: maa.org 
MiniMart Madness – June 21, 2015 

Relive the chat: Storify  Original Problem: coast2coast.me/nate 
Towers and Lifters – September 6, 2015 

Relive the chat: Storify  Original Problem: exploringcs.org 
How Tacky! – September 13, 2015 

Relive the chat: Storify  Original Problem: octm.org 
An Inheritance Problem – September 20, 2015 

Original Problem: gottfriedville.net  
A Tale Of Five Cities – September 27, 2015 

Original Problem: gcschool.org  
Basketball Practice – October 4, 2015 

Original Problem: ME!!!!  
How Much Can We Spend? – October 18, 2015 

Original Problem: nrich.maths.org  
Across the Cubes – October 25, 2015 

Original Problem: nctm.org  
Counting Squares – November 1, 2015 

Relive the chat: Storify  Original Problem: illuminations.nctm.org 
Duck, Goose, Duck – November 8, 2015 

Original Problem: geom.uiuc.edu/~lori  
Locker Problem – November 15, 2015 

Original Problem: mathforum.org  
Hands Off The Mac And Cheese – November 22, 2015 

Original Problem: jrmf.org  
Pattern Questions – November 29, 2015 

Original Problem: @HarMath 