Thu, 19 Mar 2026 18:00:01 -0700WeeblyThu, 26 Feb 2015 12:38:13 GMThttps://www.collaborativemathematics.org/blog/challenge-15-pizza-partyYou're invited to the Collaborative Mathematics Challenge 15 Memorial Pizza Party! No RSVP is required; we've got plenty of pizza to go around (250 slices, in fact)!

The theme this time is about making a mathematical argument. Share your thoughts and solutions in a response video, or via the new discussion section on the Challenge 15 page. I hope you're hungry!
]]>Wed, 28 Jan 2015 14:08:12 GMThttps://www.collaborativemathematics.org/blog/challenge-14-tick-tick-tickHappy New Year math fans! The first challenge video of 2015 has arrived. It's Challenge 14, showing here on the homepage and on YouTube.Your time starts now!

Share your thoughts and solutions in a response video, or via the new discussion section on the Challenge 14 page. Your time starts now!]]>Tue, 02 Dec 2014 12:14:22 GMThttps://www.collaborativemathematics.org/blog/first-response-to-challenge-13Jacob H. from Austin, Texas wrote a few computer programs to perform the numerical recycling procedure from Challenge 13.

In his response video, Jacob demonstrates how his programs work and describes his results. He also poses a fantastic new question about the numerical recycling procedure that emerged as he studied the original challenge.

What other thoughts do you have about Challenge 13? Do Jacob's results give you any ideas? How would you approach the new question Jacob poses? Get in touch and share your thoughts!
]]>Wed, 12 Nov 2014 09:17:07 GMThttps://www.collaborativemathematics.org/blog/challenge-13-numerical-recyclingNovember 15, 2014 is America Recycles Day, and Challenge 13 is an open-ended exploration of "numerical recycling" inspired by a problem from the blog Math For Love. Watch the video, get your hands dirty with some experimentation, and let us know what you discover!
]]>Mon, 13 Oct 2014 15:58:00 GMThttps://www.collaborativemathematics.org/blog/challenge-12-and-ada-lovelace-dayOctober 14, 2014 is Ada Lovelace Day, a day to celebrate the achievements of women in science, technology, engineering, and mathematics. Ada, and the field of computer programming, are the inspiration for Challenge 12. Enjoy!]]>Wed, 01 Oct 2014 20:41:20 GMThttps://www.collaborativemathematics.org/blog/classroom-resources-for-teachersTeachers, visit our new curriculum page! We are happy to now offer a lesson outline with tips for structuring a class period around the exploration and discussion of a Collaborative Mathematics video challenge. Plus: we have a student handout for each of the challenges!
]]>Thu, 18 Sep 2014 15:04:08 GMThttps://www.collaborativemathematics.org/blog/were-back-me-heartiesAvast! After taking a break for the summer, CollaboMath is back. Challenge 11 is a salty one, in honor of International Talk Like a Pirate Day (September 19). Batten down the hatches and have a go, you scurvy dogs! Click here!]]>Wed, 07 May 2014 12:14:32 GMThttps://www.collaborativemathematics.org/blog/challenge-10-part-3-is-upWe're making the most out of Challenge 10 with a third pandigital puzzler! Check out Part 3, now available here and on our YouTube channel. While you're at it, which not have a go at Part 1 or Part 2 (or both)?

After the tests? Why not CollaboMath? Teachers: it's time for the big end-of-year tests, we know, but keep CollaboMath in mind for those last few weeks of the school year!

Consider engaging groups of students in one of these:

• Patterns and linear relationships: Challenge 03: Finger Counting, or Challenge 08 (Part 1): The Confetti Problem.
  
• Geometry: Challenge 05: International Paper.
• Probability: Challenge 07: String Theory.
• Counting: Challenge 01: Ermer Numbers or Challenge 06: Pieces of Eight or Challenge 09: Awe of Large Numbers.

]]>Tue, 22 Apr 2014 16:13:06 GMThttps://www.collaborativemathematics.org/blog/challenge-10-part-2We continue our posing of pandigital problems this week with Challenge 10, Part 2. It's available on the front page, and also on our YouTube channel (alongside Challenge 10, Part 1).

We know that it's hard to bring in extension activities as standardized test season rolls around, but as the year comes to a close, please keep Collaborative Mathematics in mind!

Why not spend some of those last weeks after the tests making a mathematical mess with Challenge 08 -- I mean, you're probably going to recycle a bunch of those old handouts anyhow, right?

Or, maybe your students are looking for something more relaxed at the end of the year -- why not go back to counting on your fingers with Challenge 03?
]]>Tue, 08 Apr 2014 11:59:16 GMThttps://www.collaborativemathematics.org/blog/challenge-10-is-hereWe're celebrating out tenth challenge with a series of pandigital puzzlers! Challenge 10, Part 1 is now available here, and on our YouTube channel.

Speaking of YouTube, CollaboMath has recently been accepted into YouTube EDU, a free source of educational content from around the world. Thanks to all who nominated us!]]>