My first editorial for @nctm.org's research journal, the Journal for Research in Mathematics Education: Mathematics Education at the End of the World pubs.nctm.org/view/journal... #iteachmath #EduSky

People in Minneapolis love their neighbor.

#mathmeme that has prompted a swell of calls for Dedekind cuts www.tumblr.com/mathhombre/8...

We are excited to announce the keynote speaker for Math in Action 2026 on February 28, 2026 at Grand Valley State University! Don’t miss out! Register by 1/30/26 for the best rate! Discounts available for first-time attendees! www.gvsu.edu/mathinaction/ #mathinaction #math #iteachmath

Our great local conference #mathinaction is coming up. Excited about this year's keynote! www.gvsu.edu/mathinaction.... Register from the link up top.

Here's a free version of the article: drive.google.com/file/d/1sKID... Otten, S. (2011). Cornered by the real world: A defense of mathematics. Mathematics Teacher, 105, 20–25. #MathEd

It’s the first One Hundred Factorial session of the new year tomorrow! I know the forecast is 41°C but nothing is going to stop me having some mathematical joy. (Plus there’s ice blocks in the freezer.) davidkbutler.xyz/one-hundred-...

The most veteran of the first grade teachers in this team always advocates for this point too, and I so appreciate it. When you have to account for every minute, it's hard to justify free play, but the payoff is dramatic.

#mathart #howmany www.tumblr.com/mathhombre/8...

Dan advocating for hands on math mathforlove.com/2026/01/mani... @mathforlove.bsky.social A wise teacher taught me his no.1 point and I >never< regret it.

[New Post] Ontario Math Links - My favourite #math related links from this week: ontariomath.blogspot.com/2026/01/math... Links and help from @karencampe.bsky.social @johngolden.bsky.social @helsig.bsky.social and more #MathChat #MTBoS #iTeachMath

Check out these #PlayfulMath resources! #iTeachMath #MTBoS #MathsToday

@slotkin.senate.gov What a start to 2026. Maduro = obvious bad guy. Illegal, imperial US military actions to grab for resources is a far worse thing. Please oppose with all your strength. Thanks for your representation.

@peters.senate.gov What a start to 2026. Maduro = obvious bad guy. Illegal, imperial US military actions to grab for resources is a far worse thing. Please oppose with all your strength. Thanks for your representation.

A little slower.

#mathart play in #geogebra with spirals. www.tumblr.com/mathhombre/8...

Miko Imura/Hirono Tyle shared a blogpost on this cool heptagon based #tessellation. note.com/tairu_mk/n/n... (in Japanese, but translates well.)

Any Detroit area teachers out there who want to take your pick of a large collection of office supplies? DM me for details ASAP if you’re at all interested.

She created some of the original dice images I've used for #unitchats for many years. She also made this gorgeous image that we used (with her permission) as the cover of one of our curriculum books.

This is where I met her and you and so many, many, many of my #MTBoS loves. My heart hurts beyond measure for all who knew and loved Malke. Hey Joy and light will live forever.

I never met her in person, but I worked with her on a piece of hers that I included in Playing with Math: Stories from Math Circles, Homeschoolers, and Passionate Teachers, in 2015. She was lovely to work with. I am so sad.

As pointed out by @paulakrieg.bsky.social and noted by @mpershan.bsky.social, longtime #mtbos partner and collaborator Malke Rosenfeld passed away last year. She investigated and taught the mind-body math connection, engaging hundreds of teachers and learners in #mathart - dance! RIP great friend!

Thank you @johngolden.bsky.social Your reach is far greater than mine! I will Zoom teaching an introduction to solids class for the Canadian BookBinders and Book Artists Guild in January www.cbbag.ca/event-6403035

Been having a good old time constructing pattern block shapes and then adding designs to the faces. Here's a peak at me pushing them around to see what happens: youtu.be/ss_w0CiQuCY #symmetry #patternblocks #geometry #rhombicPrism #rhombus #bluepatternblock #mathart

#mathart and 3D rhombus prisms from @paulakrieg.bsky.social bookzoompa.wordpress.com/2025/12/29/t...

New Blog Post: Measuring Growth in Mathematical Reasoning: What Mia’s Thinking Reveals In October, Mia correctly answered 10 out of 12 questions. In December, Mia correctly answered 10 out of 12 questions. Again. And yet, the December interview demonstrated significant growth. How?

Testing whether astrology works www.clearerthinking.org/post/can-ast... they include a lot of their data thinking. Wondering about using in a stats course for elem/MS PSTs. #mtechat

I am saddened by the news that Courtney Cazden has passed away. I remember meeting her at one of my first @aeraedresearch.bsky.social meetings, and she was kind enough to talk to me as a doctoral student. (cont'd) cgscholar.com/community/co...

#iTeachMath #MathSky #MTBoS Yay, the next math(s) play carnival is in town! 🎉😍🎠

Yes, late for holiday gifts this year, but good for exploring anytime in math class. Now I'm thinking about the cowlick theorem.

too late BBC! www.bbc.com/future/artic...

#playfulmath carnival 183! mathhombre.blogspot.com/2025/12/play... Writing on teaching, fun math, puzzles, games, art...

via geologist friend. A climate change video with loads of proportional thinking and unitchat opportunities. www.youtube.com/watch?v=Ifgl...

#playfulmath carnival 183! mathhombre.blogspot.com/2025/12/play... Writing on teaching, fun math, puzzles, games, art...

I'll email you. I kind of like this page I made: docs.google.com/document/d/1...

I've found a couple new math-y puzzles recently: One Up Puzzle which is a sudoku variant (can't repeat digits in a row or column, but barriers reset the numbers available to use) www.oneuppuzzle.com

Playing with a bad #dataviz IMHO, but Voronoi's was even worse. www.geogebra.org/m/wxsuccda #geogebra

Putting the 4th quarter #MathPlay blog carnival together. Anything you've made or written that you want to share? Anything you've read or watched that you want to share?

Three cool tessellations from a HS art class. #mathart www.tumblr.com/mathhombre/8...

Fun and charming math magic from Tanya Khovanova www.youtube.com/watch?v=cHaF...

#iTeachMath ♾️ Scene from Althea and the Mysteries of Calculus: Sofia steps up, and says, “We start with the definition. It’s like the slope, but we use f of x plus h and f of x, instead of y2 and y1. So we’d have this. It’s pretty ugly, do you think it’s right?" [equation here] 1/x

#mathart Detroit

Love the Reddit discussion on this geeky stats #mathmeme www.reddit.com/r/theydidthe...

#mathgame galore - 13 fraction games we used in 4th and 5th grade last semester. mathhombre.blogspot.com/2025/12/13-f...

#mathgame galore - 13 fraction games we used in 4th and 5th grade last semester. mathhombre.blogspot.com/2025/12/13-f...

Evidence points me toward a main culprit - and it's not what's being discussed in many of the stories about UCSD. Read my latest Math Values post: Students are Struggling. Why? 2/2 maa.org/math-values/...

It's done! And ahead of schedule... (for once!) A fully revised 2026 version of the Risps PDF eBook is now available for free, from www.risps.co.uk and from Payhip. payhip.com/b/RGKPF An early Ch-risp-mas present? With best wishes of the season, Jonny

Edwin Abbott Abbott's birthday! Good day to muck about some higher dimensions. www.tumblr.com/mathhombre/8... #mathstory

Fraction visualizer in #geogebra www.geogebra.org/m/rewqc4mp