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Glenn Waddell, Jr. Ph.D.

@gwaddell.bsky.social
817 followers 1.2K following 191 posts

Finding ways to put people first for my PSTs and ISTs. Teaching Associate Prof in a STEM Education program. I blog at mrwaddell.net/blog. My comments are my own. he/him. #MTBoS (Math TEACHER Blog o'Sphere) #ITeachMath #EduSky #MathSky

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Reposted by Glenn Waddell, Jr. Ph.D.
Alex Veenendaal @alex.veenenda.al · 29/07/2026
this is the way
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Reposted by Glenn Waddell, Jr. Ph.D.
scul diva ❌👑 @sculdiva.bsky.social · 21/01/2026
This needs more attention 🚨 #science @standupforscience.bsky.social @altfda.altgov.info @roguenasa.altgov.info @altcdc.altgov.info @roguenoaa.altgov.info @alt-nihscience4all.altgov.info @altnoaa.bsky.social @cdelawalla.bsky.social
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 15/01/2026
Another of my #LostMath documents. The Magic Circle by Ted Ostrander and Arthur Wiebe. It is found on one website. I did it years & years ago with students, & still have one of the balls I created with the result. Give it a try! It is wonderful. #MTBoS #ITeachMath www.dropbox.com/scl/fi/kk35b...
dropbox.com
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Reposted by Glenn Waddell, Jr. Ph.D.
Julie R Wright @julierwright.bsky.social · 11/01/2026
Great thread. UK math teachers have started using the tag #MathsToday for positive math moments.
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 08/01/2026
Has anyone used the MTLT as a primary source of readings for a university math methods (secondary) class? I am revising my class for this semester, and considering doing so. Any experience you want to share? Thoughts in general? #ITeachMath #ITeachTeachers #MTBoS
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Reposted by Glenn Waddell, Jr. Ph.D.
MTEP 2.0 @mtep2-0math.bsky.social · 08/01/2026
⭐ New from MTEP! Explore how Michigan & Iowa are strengthening early math through coherence, collaboration, and statewide alignment. Don’t miss the latest update! 👉 newsroom.unl.edu/announce/mte... #MTEP #NCTM #AMTE #NCSM #MTBoS
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Reposted by Glenn Waddell, Jr. Ph.D.
John Golden @johngolden.bsky.social · 31/12/2025
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!
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 29/12/2025
I took some complex & creative math ?? I gave as hmwk last year in a college course & put them in Gemini. It solved every one of them. With explanation. My ? is, what are university math faculty doing to make learning central to class when AI can short circuit learning? #MTBoS #ITeachMath #MathSky
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Reposted by Glenn Waddell, Jr. Ph.D.
Madeleine F-B @mxfb.bsky.social · 13/12/2025
How wonderful to have an episode with @dylanwiliam.bsky.social on #TheyBehaveForMe podcast with @amymayforrester.bsky.social and @adamboxereducation.bsky.social who did the whole interview with a tiny baby in a carrier. open.spotify.com/episode/3Wcj...
open.spotify.com
What is formative assessment, and why should anybody care? With professor Dylan Wiliam
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Reposted by Glenn Waddell, Jr. Ph.D.
Forum for Equity in Elementary Mathematics @mathequityforum.bsky.social · 24/11/2025
Session 1 of our Speaker Series, by @pamseda1.bsky.social, got Session 3's @jennalaib.bsky.social thinking: "When does it make sense to change [cultural] elements?... The answer isn’t a checklist or a directive. It’s a stance... I strive for intentionality & balance... Why this shift? & for whom?
jennalaib.com
Culture & Identity in the Math Classroom
How do elements of the culture students bring into the classroom interact with the classroom culture we create? What does it mean to shift or honor them? Earlier this week, I watched the first sess…
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Reposted by Glenn Waddell, Jr. Ph.D.
Matt Enlow @unsolvedmre.bsky.social · 21/11/2025
The older I get, the less interested I am in contrived "contest problems," and the more interested I am in - focusing on deep, enduring truths - dwelling in mystery, contradiction, enigma - finding beauty in simplicity #Math #MathSky #iTeachMath
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 21/11/2025
I just had a graduate, who is taking a leadership role in his department, ask for examples of algebra tests that have good conceptual questions. He wants to bring examples to his dept to encourage the discussion. Does anyone have any resources? #iTeachMath #MTBoS #MathTeaching #MathAssessments
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 20/11/2025
Longshot question for my network. Is anyone in Hong Kong? I am looking for a book, and one copy exists in the world, in a library in Hong Kong. search.worldcat.org/title/513774... They won't even photocopy the table of contents for me. #FindABook #iTeachMath #LostBooks
search.worldcat.org
MATHGRAF : functions to pictures | WorldCat.org
MATHGRAF : functions to pictures | WorldCat.org
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Reposted by Glenn Waddell, Jr. Ph.D.
NCTM @nctm.org · 05/11/2025
The latest issue of MTLT is out now! 🌳 The Front & Center article explores how teachers can make informed decisions about when to move on in a lesson. 🔒 NCTM Members can access now: nctm.link/wkL2v
MTLT Cover Pacing in a Discourse-Rich Lesson
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 14/11/2025
@tguindon.bsky.social @annlovesmaths.bsky.social @thestarcaller.bsky.social @ash-bans.bsky.social I just found the 3rd book by Dr. Shih. It is called MathGraf, and the single copy my library could find that exists *only* in a library in Hong Kong. In negotiations for a scanned table of contents now.
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 12/11/2025
This is FABULOUS! What a great way to show off what Dr. Shih did in his book. Love it! Thank you Tim.
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 11/11/2025
I have two books by an author, Keh-Gong Shih, pub in 1996 that are just brilliant! But they are definitely lost. The first is PIctorial Mathematics: Patterns. It is fabulous! full of images like this. He created his own software called Mathgraf which is used to generate the images. #mathart #mtbos
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Reposted by Glenn Waddell, Jr. Ph.D.
Dan Meyer @ddmeyer.bsky.social · 07/11/2025
👋 Here is a zip file with all the handouts & slides people uploaded from the NCSM & NCTM annual conferences last month. Scraped the conference website. 400 files. 1GB. Who loves you? Me, that's who. limewire.com/d/nQXRY#AX97...
limewire.com
Download ncsm-nctm-2025.zip | LimeWire
Download ncsm-nctm-2025.zip on LimeWire
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Reposted by Glenn Waddell, Jr. Ph.D.
Miriam Posner @miriamposner.com · 31/10/2025
Eminently reasonable proposed principles for professors’ use of AI, from a student refusinggenai.wordpress.com/2025/08/29/a...
• Professors should never put a student's words or work into an AI
software without their consent.
• Professors should also be transparent about their Al usage with grading, curriculum building, and any other way they might use it in their teaching.
• If a professor does use Al chatbots in the classroom, they should explain their reasoning behind this decision and how its usage will help students meet learning
outcomes.
• Professors should additionally respect a student's choice to refuse Al. To do this, it would be ideal that they have assignments that students can choose from that do
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Reposted by Glenn Waddell, Jr. Ph.D.
Teacher2Teacher @teacher2teacher.bsky.social · 31/10/2025
👇 Three little letters that can make all the difference: (Inspiration via T Ms. Ivey)
Bulletin board display is titled " ... YET: The Most Powerful Addition" and reads "I don't get it + yet = Optimism; I can't do this + yet = Perseverance; I can't do math + yet = Growth Mindset."
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Reposted by Glenn Waddell, Jr. Ph.D.
Annie Fetter @mfannie.bsky.social · 30/10/2025
Think a #NoticeWonder shirt would be awesome? It could be a reality if you move fast! The store is open today through Nov 9. Hopefully enough styles, sizes, and colors to suit everyone. #ITeachMath #MTBoS
A picture showing three shirts and a onesie, with text that reads Notice and Wonder Shirts, Men's, Women's, Youth, Toddler, Onesies, Store open October 29-November 9, $16-21, all profits go to TODOS.
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Reposted by Glenn Waddell, Jr. Ph.D.
Gizem Karaali 🧿 @gizem-karaali.bsky.social · 30/09/2025
Hi Blue Sky! I edit the Journal of Humanistic Mathematics. We publish articles, essays, #fiction & #poetry on doing, teaching & living of #mathematics. So far we had more than 850K full-text downloads of our content - why not check us out? scholarship.claremont.edu/jhm/ #math #openaccess #mathart
scholarship.claremont.edu
Journal of Humanistic Mathematics - an online-only, open access, peer reviewed journal | Current Journals | Claremont Colleges
Journal of Humanistic Mathematics - an online-only, open access, peer reviewed journal published by the Claremont Colleges Library.
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Reposted by Glenn Waddell, Jr. Ph.D.
Dave Richeson @divbyzero.bsky.social · 29/10/2025
I met with my knot theory independent study students today. The topic: braids. I broke out these "BraidTiles" that I made several years ago. You can download a printable pdf here (recommendation: print them on cardstock): divisbyzero.com/2019/05/01/b...
A photo of BraidTiles
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Reposted by Glenn Waddell, Jr. Ph.D.
ꭓle Ormsby 𓆙 @e-infinity.space · 29/10/2025
This is a real sign from a real deli near the Wesleyan math department, and they put it up because the mathematicians were too engrossed in their mathematics discussions to efficiently order sandwiches. www.cbc.ca/radio/asitha...
cbc.ca
The story behind that Connecticut deli math sign | CBC Radio
When Professor Anna Haensch saw the sign, she knew someone at the university's math department had to be responsible.
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Reposted by Glenn Waddell, Jr. Ph.D.
Raj Raizada @rajraizada.bsky.social · 29/10/2025
The new surface-colouring option in @desmos.com 3D allows a cute way of visualizing conic sections. www.desmos.com/3d/fiv5gnltdl (The option to have translucent surfaces doesn't save with the graph itself, so needs to be re-toggled on. It's important for seeing the full curves) #MathSky #iTeachMath
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Reposted by Glenn Waddell, Jr. Ph.D.
Patoss @patoss-dyslexia.bsky.social · 29/10/2025
📣 Live FREE Webinar Series for Educators this November designed for parents, teachers, SENCos, and support staff who want to strengthen their knowledge and classroom practice around maths learning differences. Book now: www.patoss-dyslexia.org/Live-Webinar... #Dyscalculia #MathsEducation #SEN
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Reposted by Glenn Waddell, Jr. Ph.D.
iteachkids.bsky.social @iteachkids.bsky.social · 29/10/2025
Great resource for students with dyscalculia. A context dependent calculator: dyscalculator.app #disablities #iteachkids #mtbos #MathSky
dyscalculator.app
DysCalculator™ Home
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Reposted by Glenn Waddell, Jr. Ph.D.
Tom Bowler @ridermeister.bsky.social · 29/10/2025
@ukmathstrust.bsky.social are here! #MathsToday #AlevelMaths #UKMathsChat
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Reposted by Glenn Waddell, Jr. Ph.D.
Nicola Rennie @nrennie.bsky.social · 28/10/2025
Slides: nrennie.rbind.io/talks/yss-ya...
nrennie.rbind.io
Beyond the Basics: Data Visualisation – Nicola Rennie
In this talk, I’ll showcase why you should visualise data, present some guidelines for making more effective charts, before discussing examples of good and not so good charts.
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Reposted by Glenn Waddell, Jr. Ph.D.
Sarah DiMaria @msdimaria.bsky.social · 27/10/2025
#NCTMATL25 reminded me that conferences are really about people. The sessions are great, but the best moments happen when you connect with fellow educators, share ideas, and leave inspired. Grateful for every conversation in Atlanta! #EdChat #MathEd #edusky
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Reposted by Glenn Waddell, Jr. Ph.D.
MTEP 2.0 @mtep2-0math.bsky.social · 27/10/2025
Math teacher shortages continue to grow nationwide. The CBMS 2024 Report calls for urgent action to recruit & retain qualified math teachers. Explore key findings & solutions here ➡️ bit.ly/mtepCBMSrrr #MTEP #NCTM #AMTE #NCSM #MTBoS
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Reposted by Glenn Waddell, Jr. Ph.D.
Jennifer Abel @abeljennifer.bsky.social · 27/10/2025
🎉 New blog alert! 🚀 "Synthetic Division, Nix the Tricks, and Conversations that Matter" Reflections on our Nix the Tricks book study. 👉 Read more: mathsational.blogspot.com/2025/10/synt... #MathEd #TeachingStrategies #KeepTheWhy #iTeachMath #MTBoS
mathsational.blogspot.com
Synthetic Division, Nix the Tricks, and Conversations that Matter
I used to declare that I hated synthetic division. It always felt like a jumble of steps with no real meaning behind them, and my students...
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Reposted by Glenn Waddell, Jr. Ph.D.
TODOS: Mathematics for ALL @todos-math.bsky.social · 28/10/2025
Join the TODOS Book Club! Explore Antiracist Mathematics Education: Stories of Acknowledgment, Action & Accountability (on Amazon). Commitment: Readings & guided discussions over several sessions. Register now for Nov 19, 2025! us02web.zoom.us/webinar/regi... #MathEquity #iTeachMath #EduSky
A flyer for the TODOS: Mathematics for ALL Virtual Book Study. The design features four colorful, student-style paintings arranged in diamond shapes: one shows a blue face, another depicts green and orange trees along a road, a third shows two people in front of a ferris wheel and buildings, and the fourth features an abstract blue-and-white cityscape. The TODOS logo appears on the left, followed by the book title Antiracist Mathematics Education: Stories of Acknowledgment, Action, and Accountability. On the right, green and yellow text reads “Virtual Book Study – Nov 19 | 4:30 PM PT – Section 1: Students.” The overall background is olive green with a diagonal split design.
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Reposted by Glenn Waddell, Jr. Ph.D.
Mike Steele @mdsteele47.bsky.social · 25/10/2025
It’s amazing to me that we still have people cherry picking what they think qualifies as research-based best practice and castigating @nctm.org based on those biases. Seems a good time to remind everyone that NCTM runs the top tier research journal in the field. #iteachmath
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 25/10/2025
This is so important. I wish a teacher had done any of these for me. I just learned coping techniques on my own.
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Reposted by Glenn Waddell, Jr. Ph.D.
David K Butler @davidkbutler.bsky.social · 25/10/2025
This I posted on Twitter in 2020 is currently experiencing a resurgence.
A screenshot of a Twitter post.
It’s from David Butler (me) at 4:55 16/7/2020.

The text says: 
Separating rational functions using partial fractions is a change of basis. I knew this already.
But today I realised that this means you can do it WITH A MATRIX.

The image shows maths:
To separate 3 x + 1 over x+1 times x+2 into partial fractions …

1 over x+1 times x+2 = 1 over x+1 plus -1 over x+2

x  over x+1 times x+2 = -1 over x+1 plus 2 over x+2

2 by 2 matrix with first column 1 and -1 and second column -1 and 2
times column vector 1 and 3
=
column vector -2 and 5

Therefore 3x+1 over x+1 times x+2 = -2 over x+1 + 5 over x+2
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 18/10/2025
Now that #NCTMATL25 is over, The next best thing is to scroll through all of the posts from the hashtag and follow everyone I wasn't already following. Great way to build a wonderful list. Thank you all for a fabulous week!.
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Reposted by Glenn Waddell, Jr. Ph.D.
John Golden @johngolden.bsky.social · 18/08/2025
Happy 50th birthday, fractals! daily.jstor.org/fifty-years-...
daily.jstor.org
Fifty Years of Fractals - JSTOR Daily
A half century ago ago, Benoit Mandelbrot coined the word "fractal" and pioneered a new type of geometry.
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Dr. Maria at Natural Math @maria-naturalmath.bsky.social · 17/08/2025
Is it a good thing that I get all the pictograms? #iTeachMath #MathSky #iHaveMathFriendsEverywhere
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Reposted by Glenn Waddell, Jr. Ph.D.
We Are RLadies+ @weare.rladies.org · 14/08/2025
Running R code on your phone... that is definitely magic!! webR also makes it super easy to create #rstats learning resources that students can work with using just a browser, no install drama needed. jen-richmond.quarto.pub/barbarplots/
jen-richmond.quarto.pub
Penguins #barbarplots
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 12/08/2025
@misscalcul8.bsky.social Just wanted to let you know I shared your bell work posts with a teacher intern. You are amazing, and what you do matters! Thank you so much for all you do Elissa!
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Glenn Waddell, Jr. Ph.D. @gwaddell.bsky.social · 09/08/2025
My entire program uses these at the undergraduate level. They matter so much! And my students appreciate the thoughtfulness.
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Reposted by Glenn Waddell, Jr. Ph.D.
benjamin dickman @benjamindickman.bsky.social · 09/08/2025
I presented on this problem today! You can find the slides here: docs.google.com/presentation... I don't use speaker notes (just vibes) but I think a recorded version exists and I'll try to link to it if/when I can. cc #iTeachMath ♾️ bcc #MathSky 🧮
docs.google.com
21st Century Math [2025] Explorations from Fibonacci Nim
Explorations from Fibonacci Nim Ideas, Wonders, and Unresolved Problems Inspired by the 21st Century Mathematics 2025 Program Benjamin Dickman, Ph.D. || K-12 Mathematics Chair & Teacher Department of ...
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Ilana Cyna @ilanacyna.bsky.social · 24/07/2025
I have compiled a list of teaching routines/structures. Let me know what I am missing! tinyurl.com/49m2j2wu #iteachmath #mtbos #edusky
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Crystal Lewis @cghlewis.bsky.social · 25/07/2025
Friends don't let friends collect data without adding data validation. From Rebekah Jacob 😉
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Melynee Naegele @mnmmath.bsky.social · 06/07/2025
Shelli’s sister asked me to share that “the service is going to be on the funeral app after the funeral. Please tell everyone to watch. They may see their picture. All the songs are going to be her singing.”
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Reposted by Glenn Waddell, Jr. Ph.D.
Melynee Naegele @mnmmath.bsky.social · 05/07/2025
The funeral service for Shelli Temple, @druinok.bsky.social will be held July 9, at 10 AM in the CHS Activity Center. The obituary & additional information will be updated on the funeral home website as it becomes available. www.johnsonsperry.com/obituaries/s... #MTBoS #ITeachMath
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Jess Calarco @jessicacalarco.com · 02/07/2025
The Trump administration is currently holding hostage nearly $7B in federal funding for K-12 schools--funding that was supposed to be distributed yesterday. They've stolen $80M from Wisconsin students and teachers alone. How much have they stolen from your state? www.edweek.org/policy-polit...
edweek.org
See How Much School Funding Trump Is Holding Back From Your State
The administration is holding back nearly $7 billion for English learners, after-school programs, professional development, and more.
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Reposted by Glenn Waddell, Jr. Ph.D.
Arghavan Salles, MD, PhD @arghavansallesmd.medsky.social · 16/06/2025
This is worth 3 minutes of your time. No one wants to eat at a restaurant that only serves bland chicken. (It’s not about chicken, or restaurants, tho)
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Reposted by Glenn Waddell, Jr. Ph.D.
Erik Ledbetter @bandoblue.bsky.social · 14/06/2025
Some thoughts about the military parade in my hometown of Washington DC today -- specifically, the route. Military parades in DC are quite rare. But when they happen, they have always begun, symbolically and geographically, at the Capitol and moved outward. 1/
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