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

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

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

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

🚨 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...

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

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!

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...

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:

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

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! 🤣

Here are three reasons I think all math educators should use social media to improve professionally. robertkaplinsky.com/3-reaso...

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

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

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/

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...

A wonderful learning day in PSSD about Spiraling Your Math Curriculum. Always happy to have access to @wipebook.bsky.social for our thinking tasks & collaboration time! @pstateachers.bsky.social

Peter Liljedahl and Mike Flynn will be hosting a live webinar about #BTCthinks. Join Peter, Mike and classroom educators on Sept. 18 at 5:00 PM PST for a live conversation. Registration is FREE for anyone to attend! Register here: www.buildingthinkingclassrooms.com/webinar #MTBoS #iteachmath

Did you know that Hyundai offers a 100,000 mile in countries that use miles and 100,000 km warranty in countries that use the metric system? Are they the same? If not, which is better for the consumer and which is better for Hyundai? robertkaplinsky.com/work/ca...

A thing I made back in 2017. Twelve pyramids joined together in two zigzags roll up into two cubes and one silver rhombic dodecahedron.

Thanks to all the participants in my Rich Task and AI Workshop today at #ITCamp2025. So much wonderful learning! @wipebook.bsky.social #hrcemath

The penultimate week of #MathPhoto25 is #circles! Where do you notice circles, cylinders, spheres or ellipses in the world around you? #ITeachMath #MathsToday

Go from wondering about how to use open questions in math instruction to confidently creating your own or adapting ones you find. Learn more about Marian Small's How To Create And Use Open Questions In Math Class online workshop at grassrootsworkshops.com/wor...

I've heard lots of great ideas in presentations, but I often need more time to think about an idea, try it out, and learn more. That's why I made my six-week online workshop to help teach math through problem solving. Learn more at: https://robertkaplinsky.com/eps/

Playing Mastermind with my 6 year old inspired me to make this in #Desmos. I discovered I'm a lot worse at guessing than I thought! #MTBoS #iteachmath classroom.amplify.com/activity/687...

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...

ICYMI, Math Tasks for the Thinking Classroom, Grades 6-12 (aka "the burgundy book") is available for preorder! US customers: Pre-order from Corwin.com and use code SAVE20 to receive 20% off! Canadian customers: Pre-order from University of Toronto Press (t.ly/WVNCg) with code TASKS20 for 20% off!

Vancouver!📣 I’m hosting a laid-back Choosing To See Book Tour coffee meet-up on July 7 — come connect, sip ☕, and chat about student-centered learning. 📍 We Bake Cafe, 9630 Cameron Street, Burnaby, BC | 🕖 5-6 PM 🔗 RSVP: sedaeducationalconsulting.com/events-1 #Choosing2See #ICUCARE #dbc_inc

Feeling inspired by @amyschang.bsky.social today, which is not at all surprising. Leading with curiosity in the #thinkingclassroom. open.spotify.com/episode/1Nru...

Peter's first ever online workshop is coming to @grassrootsworkshops.com! Pretty exciting news.

Just a few of our INCREDIBLE lineup at #BTCC25 @tammymcmorrow.bsky.social @latrendak.bsky.social @peterliljedahl.bsky.social

Join the 1st @grassrootsworkshops.com for Building Thinking Classrooms! Learn directly from @pgliljedahl.bsky.social through 6 modules, 20 research-backed lessons, and 80+ videos. Put your BTC learning into practice right away! More info here: grassrootsworkshops.com/workshops/bu...

If you are attending #BTCC25, Corwin will take orders there, and @pgliljedahl.bsky.social and @webbkyle.bsky.social can sign a "book plate" for you to insert into your book when they you receive it in the fall!

Exciting news! Mathematics Tasks for The Thinking Classroom, Grades 6-12 is in production and available for pre-order, with a publication date of early October! Pre-order your copy here: corwin.com/books/btc-ma... #btcthinks #iteachmath #MTBoS #thinkingclassrooms

Excited to continue using EdTech to empower Ss to actively explore, discover, & THINK as I further integrate it in BTC practices. Here, the start of a new workshop for 2025 BTC conference in Seattle, & one I'll virtually facilitate later this yr. @peterliljedahl.bsky.social @btcthinks.bsky.social

For those of you who are interested in seeing what a BTC lesson looks like, the Dutch BTC website has just posted some amazing classroom videos of Maarten Müller doing a convergent and a divergent lesson. They are in Dutch but the visuals are amazing. buildingthinkingclassrooms.nl/beeld-en-geluid/

It's Mental Math Monday! How would you mentally calculate this: 45 is 30% of what number?

Some screen grabs of my OAME presentation, “Let’s Get This Straight: Making Sense of the Explicit vs. Inquiry-based Instruction Discourse and What it Means for your Math Teaching.” The audience created word clouds, shared ideas, answered math questions & sang a little Bon Jovi. All in a day’s work.

[New Post] Ontario Math Links-My favourite #math related links from this week: ontariomath.blogspot.com/2025/05/math... links&help from @mrvalencia24.bsky.social @comapmath.bsky.social @openmiddle.com @robertkaplinsky.com @howiehua.bsky.social @unsolvedmre.bsky.social #MathChat #MTBoS #iTeachMath

Calling all math teachers! Registration is now open for the 2025 ATMNE Conference in Massachusetts October 30-31st! Click the link below. #ITeachMath #MTBoS #ElemMathChat @atmnemath.bsky.social atmim.wildapricot.org/event-5937758

One of those heart-FULL teaching days: New post: open.substack.com/pub/fawnnguy...

Common denominators is a common fraction comparison strategy, but did you know we can use common numerators as well? Here's how we can do this:

Assessment is a process, not an event.

Take a swing at our latest monthly challenge: Contour Golf! ⛳ In this activity for grades 8+, students will aim for a hole-in-one by mastering the right combination of power and direction on various 3D graphs. Join classrooms nationwide here: student.desmos.com/join/w2cpb8 #MTBoS #ITeachMath

New: Sneaky Brilliance Built Into the Desmos Platform open.substack.com/pub/fawnnguy... #MTBoS #iteachmathh

Thinking about #BuildingThinkingClassrooms? Here’s your chance to learn directly from Peter Liljedahl. 💡 Practical, high-impact workshops—no matter where you are in your journey. 🗺️ Explore the BTC PD roadmap: wix.to/qnr1Hmh #ThinkingClassrooms #Education #iteachmath #MTBoS

You can now embed Open Middle problems in your Canvas or on your website!

Want to know the secret to become a more effective math teacher? Learn more and register here: flynneducation.com/memberinfo #math #teacher #education