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Reposted by Kirk Keating

Robert Kaplinsky @robertkaplinsky.com · 1d

Can your high school students create a parallelogram, triangle, or rectangle by listing their points when given one? Find out using these three Open Middle problem from Bryan Anderson.
www.openmiddle.com/creating...
www.openmiddle.com/creating...
www.openmiddle.com/creating...

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DavidPetro314 @davidpetro314.bsky.social · 3d

[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2025/10/math...

Links and help from @howiehua.bsky.social @looneymath.bsky.social @mnmmath.bsky.social @abeljennifer.bsky.social @benjamindickman.bsky.social &more
#MathChat #MTBoS #iTeachMath

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Kyle Webb @webbkyle.bsky.social · 2d

After watching our book ship worldwide, my own copies finally landed. Surreal to say the least!

So excited about what @pgliljedahl.bsky.social and I created, and even moreso to get this into the hands of teachers!
#buildingthinkingclassrooms @btcthinks.bsky.social

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Kurt Salisbury @kurt-salisbury.bsky.social · 9d

✈️ Heading to NCTM?
I’m honored to be presenting again this year!
📅 Thursday, 2:30 PM
🎯 Session Title: Early Algebraic Thinking with Desmos Classroom
Here’s a short preview of the ideas we’ll discuss:
kurtsalisbury.substack.com/p/when-does-...
#mtbos #math @amplifyeducation.bsky.social

🧩 When Does Algebraic Thinking Begin?

Thinking About “Algebra” Before Algebra

kurtsalisbury.substack.com

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Erick Lee @theericklee.bsky.social · 10d

Just submitted a session proposal for OAME 2026. Looking forward to this always fantastic conference. #ITeachMath

OAME 2026 Annual Conference @oamelearns.bsky.social · Sep 20

Apply now to be a presenter at OAME 2026 - Let’s Talk Math. We are looking for diverse session proposals under the following themes:
Let’s talk equity
Let’s talk assessment
Let’s talk technology
Let’s talk content
Let’s talk pedagogy
We would love to have you!!!! bit.ly/callforproposals2026

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Kirk Keating @ksquaredmathns.bsky.social · 10d

Join us in Moncton NB for the 2026 Building Thinking Classrooms Regional Conference with @peterliljedahl.bsky.social @btcthinks.bsky.social July 6–7, 2026! 🧠📚
💡 Discover practical strategies to spark deep thinking in your classroom
📩 Sign up for updates: tinyurl.com/yc6cfbzk

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Fawn Nguyen @fawnnguyen.substack.com · 12d

Look what arrived! Just when you thought the K-5 book was big, the 6-12 is even thicker!
I've been through it already and wow—peterliljedahl.bsky.social and @webbkyle.bsky.social really delivered. You want this. 🔥

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Howie Hua @howiehua.bsky.social · 25d

TODAY'S THE DAY! It's one of the coolest dates of our lifetime.

Whether you go by month/day/year or day/month/year, if we write the date as one number, we will get a square number! Both sides can agree that today's date is a square date.

9,272,025=3045²
27,092,025=5205²

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Dr Pamela Seda @pamseda1.bsky.social · 28d

At NCTM 2025 Annual Meeting & Exposition, we’re showing how BTC & ICUCARE transform math for learners who’ve been left out.
📢Empowering Marginalized Learners in Mathematics
📅 Oct 18 | 8 AM | Georgia World Congress Center
With Dr. Peter Liljedahl
🔗 www.nctm.org/atlanta2025/...
#NCTM2025 #NCTMATL25

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Dan Finkel @mathforlove.bsky.social · 27d

Proofing #SubtractionbyHeart! The new cards are looking lovely :-)
We should have these out by early 2026!
#iteachmath #mtbos

A box of flash cards called Subtraction by Heart

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Marilyn Burns @mburnsmath.bsky.social · 28d

I'm excited to present a free webinar on September 30. Register here: heinemann.zoom.us/webinar/regi...

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Howie Hua @howiehua.bsky.social · Sep 21

Did you know that we can visually see why sqrt(40)=2sqrt(10)? Let's see how we can visualize rewriting square roots!

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BTCthinks.bsky.social @btcthinks.bsky.social · Sep 19

🚨 Registration is OPEN for the Building Thinking Classrooms online workshop w/ @pgliljedahl.bsky.social via @grassrootsworkshops.com!

🧠 6 modules packed videos, strategies & real examples to get students collaborating & thinking deeply.

👉 Register by Oct 3

grassrootsworkshops.com/workshops/bu...

The image at the bottom shows Peter Liljedahl being video recorded.

The top of the poster includes this text:

"Grassroots Workshop"
"Building Thinking Classrooms Online Workshop with Peter Liljedahl"
Dates are October 6 to November 14, 2025.

Also included in the text is 6 modules, 14 BTC practices and 16 PD Hours.

The cost is described as 4 months access for $345 USD and 12 months access for $414 USD.

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Kirk Keating @ksquaredmathns.bsky.social · Sep 19

Such a great conversation with @peterliljedahl.bsky.social & @mikeflynn55.bsky.social on what has changed since the orange book. Lots of great dialogue on the closing & building rubrics early. All these ideas will be here ➡️https://grassrootsworkshops.com/workshops/building-thinking-classrooms

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Maegan Giroux @maegangiroux.bsky.social · Sep 19

Visual Patterns 🤝 Pattern Blocks
I am currently OBSESSED, in a (mostly) healthy way, with @fawnnguyen.substack.com visual patterns and @mathforlove.bsky.social pattern blocks for kids to learn and create patterns. Ah-may-zing. Also, I am in LOVE with Mary Vail's Thinking Desks, they are phenomenal!

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Robert Kaplinsky @robertkaplinsky.com · Sep 18

Can your high school students create a parallelogram, triangle, or rectangle by listing their points when given one? Find out using these three Open Middle problem from Bryan Anderson.
www.openmiddle.com/creating...
www.openmiddle.com/creating...
www.openmiddle.com/creating...

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Reposted by Kirk Keating

Howie Hua @howiehua.bsky.social · Sep 17

Create a number where the sum of the digits is a multiple of 9. It is guaranteed that the number you created is a multiple of 9. Here's why this will always work:

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Mike Flynn @mikeflynn55.bsky.social · Sep 16

So excited for the workshop to launch. There are so many new ideas shared as well as new ways to see the ideas that were presented in the books. #buildingthinkingclassrooms

Kirk Keating @ksquaredmathns.bsky.social · Sep 15

Registration for grassrootsworkshops.com/workshops/bu... opens up this Friday, September 19th!
We are super excited to share this video-based, self paced workshop with you! #btcthinks
@peterliljedahl.bsky.social @robertkaplinsky.com @mikeflynn55.bsky.social @btcthinks.bsky.social

Building Thinking Classrooms ™ - Grassroots Workshops

Build your own Thinking Classroom using 14 research-based practices that empower students to collaborate, persevere, and think deeply and critically.

grassrootsworkshops.com

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Nova Katz @novakatz.bsky.social · Sep 16

Sometimes you stand on the furniture when creating a Thinking Classroom with a room full of families!

#theanswersare #buildingthinkingclassrooms
#iteachmath

As Peter says, “The furniture moves.” But sometimes there’s no where for it to go! 🤣

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Robert Kaplinsky @robertkaplinsky.com · Sep 15

Here are three reasons I think all math educators should use social media to improve professionally.

robertkaplinsky.com/3-reaso...

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L. Kennedy @lkennedy37.bsky.social · Sep 15

makemathmoments.com/summit

2025 Make Math Moments Virtual Summit

Free high impact MATH PD from your couch! Hosted by @makemathmoments #mmmsummit2025

makemathmoments.com

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Reposted by Kirk Keating

JoAnn Sandford @jsandford.bsky.social · Sep 14

My latest newsletter!
Check it out:
drive.google.com/file/d/1nxRu...

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Kirk Keating @ksquaredmathns.bsky.social · Sep 15

Registration for grassrootsworkshops.com/workshops/bu... opens up this Friday, September 19th!
We are super excited to share this video-based, self paced workshop with you! #btcthinks
@peterliljedahl.bsky.social @robertkaplinsky.com @mikeflynn55.bsky.social @btcthinks.bsky.social

Building Thinking Classrooms ™ - Grassroots Workshops

Build your own Thinking Classroom using 14 research-based practices that empower students to collaborate, persevere, and think deeply and critically.

grassrootsworkshops.com

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Reposted by Kirk Keating

Robert Kaplinsky @robertkaplinsky.com · Sep 13

Check out the professional development options on Grassroots Workshops (@grassrootsworkshops.com‬). There are flexible online workshops on topics including mathematics, social justice, teaching online, coding, English, wellness, and science.
grassrootsworkshops.com/

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Reposted by Kirk Keating

Robert Kaplinsky @robertkaplinsky.com · Sep 12

Want to help students develop conceptual understanding of parabolas? This lesson uses the game Angry Birds as a context for understanding what information you need to graph a quadratic.

robertkaplinsky.com/work/an...

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