I have over 70 real world problem-based lessons from kindergarten through high school that you can download for free and use with your students. Check them out and let me know which are your favorites in the comments.
robertkaplinsky.com/lessons
Know a school in Europe looking to Build some Thinking Classrooms?
Know a teacher in Europe who's read the BTC book and is hungry for more?
Are YOU in Europe and ready to join me!?
I'll be in Dusseldorf June 8-9. Details below!
Check out my latest newsletter!
This one is about working with ratios. I hope you like it!
Here's the link:
drive.google.com/file/d/1X3ZV...
#iteachmath
Coaches!! Are you getting Peter’s newsletter?
Check out this video to ensure you’re supporting teachers who are making the switch to a Thinking Classroom!
Build your own Thinking Classroom using 14 research-based practices that empower students to collaborate, persevere, and think deeply and critically.
Learn more about Peter Liljedahl's Building Thinking Classrooms online workshop at grassrootsworkshops.com/wor...
Most theme park rides have height restrictions. Sometimes you have to be taller, sometimes shorter, and sometimes in between two heights. These restrictions are a great way to introduce the idea of inequalities such as greater than and less than.
robertkaplinsky.com/work/ri...
A quick way to check if a number is divisible by 11
This would be an awesome task to thin slice for productive practice with perimeter with Grades 3 & 4 @GoodQuestionstoAskInMathClass
Basic: Same size area, stacked evenly
Intermediate: Same size area, stacked like bricks (as shown)
Advanced: 2 sizes of area, stacked evenly or like bricks
Thoughts?
If you're a presenter, you'll want to read this short post about how to avoid sounding like you say the same thing every time.
robertkaplinsky.com/present...
You know you want to spend the day with me and Jenna, or with Dave and Amy!
🚨 Math Ed friends in MA!
ATMIM is hosting a professional learning event on March 19. There are two pathways, each with two half-day workshops
K-6: @sneffleupagus.bsky.social & me
5-12: @amyschang.bsky.social & @davidporas.bsky.social
Come join us!
atmim.wildapricot.org/event-6549529
Check out new the BTC Moncton Regional Conference site. join us in July for two full days of learning with @peterliljedahl.bsky.social
btcmoncton26.netlify.app
#btcmoncton26
Hot take: We need to stop racing to the final answer in math class.
If we only teach the procedure to get the answer, we would get so many false positives. Yeah, they got the right answer, but do they actually understand the math?
Join us in Moncton, NB for the Building Thinking Classrooms Regional Conference on July 6–7, 2026 🧠
REGISTRATION is NOW OPEN!
🎟️ Get your ticket here: buytickets.at/btcregionalc...
@btcthinks.bsky.social @peterliljedahl.bsky.social
Build your own Thinking Classroom using 14 research-based practices that empower students to collaborate, persevere, and think deeply and critically.
Learn more about Peter Liljedahl's Building Thinking Classrooms online workshop at grassrootsworkshops.com/wor...
Want to build your own Thinking Classroom using 14 research-based practices that empower students to collaborate, persevere, and think deeply and critically?
Register for Peter Liljedahl's Building Thinking Classrooms online workshop by Fri 2/6.
grassrootsworkshops.com/wor...
Secondary math teachers, come learn how to use visual patterns to help students describe functions using numbers, pictures, symbols, and words.
Learn more about Fawn Nguyen's @fawnnguyen.substack.com How To Use Visual Patterns online workshop at grassrootsworkshops.com/wor...
Registration opens Friday @btcthinks.bsky.social @grassrootsworkshops.com @peterliljedahl.bsky.social Join us and engage in the self paced 6 module workshop.
grassrootsworkshops.com/workshops/bu...
Museum of Mathematics in New York City.
Rosenthal prize winners for 2025
Had a wonderful evening at MoMath for the 2025 Rosenthal Prize presentation. It was great to meet everyone and to chat about the intersection of math, magic and music. @momath.bsky.social
I had the opportunity of a lifetime to work in Barcelona, Spain where I taught 6th graders and presented to educators in Spanish about Open Middle. It was even covered in a newspaper! I am so grateful for this amazing opportunity.
Click on the link below to check out my latest newsletter:
drive.google.com/file/d/1MHZp...
Hope you like it!
#iteachmath
Build your own Thinking Classroom using 14 research-based practices that empower students to collaborate, persevere, and think deeply and critically.
Learn more about Peter Liljedahl's Building Thinking Classrooms online workshop at grassrootsworkshops.com/wor...
How do we find a balance between being in the classroom with students and our need to keep growing as professionals? Here's my take inspired by the Seven Habits of Highly Effective People.
robertkaplinsky.com/sharpen...
Check out fractiontalks.com/ from Nat Banting for fun images that get students reasoning about fractions. They're all free and ready for you to use.
Join us Dec 2 @ 4PM PST as HS math teachers Monorasmey Arun, Ed Schneider, Yuliana Segura & Megan Wood share their work w/ Evidence Based Grading-its philosophy, equity focus, & how it’s used in Alg, Geo & AP Stats
#MathEquity #TODOSLive #iTeachMath #EduSky
Register👇
us02web.zoom.us/webinar/regi...
Check out the latest episode of the @thinkthankthunk.ca podcast to hear me rant about inquiry-based vs. explicit instruction and how they fit:
thinkthankthunk.ca/ep-27/
or wherever you get your pods.
There are four book covers with the largest reading, "Building Thinking Classrooms in Mathematics, Grades K-12." The other three are translations of the cover in French, Spanish and German. Text around the book covers reads, "Celebrating 5 Years since publication" and "Translated into 15 languages." In the bottom left corner, the text reads, "Let's keep building thinking classrooms together!"
Celebrating 5 yrs since Building Thinking Classrooms in Mathematics, Grades K-12 was published!
🌍 The book has sparked a movement, been translated into 15 languages & inspired classrooms everywhere.
Here’s to curious minds, thinking deeply and bravely!
#btcthinks #iteachmath
This lesson uses a time lapse thermometer video as a context for discussing integer operations and absolute value. The video should provide some added meaning to the classic temperature drop problem.
robertkaplinsky.com/work/te...
Want to challenge your Geometry students to find the area of triangles? Try out this Open Middle problem from Dan Wulf. www.openmiddle.com/area-of-...
