Math Links for Week Ending Mar 14th, 2025

Featured Links

It's Pi Day today and typically at this time I share my Pinterest collection of Pi Day links. So here they are and my favourite connection to Pi, the fact that it's hidden in the Rolling Stones Logo
Curriculum Tags: All
https://www.pinterest.com/davidpetro314/pi-day/

Resource Links

More Pi Day resources
Curriculum Tags: All
https://bsky.app/profile/mathsweek.scot/post/3lk3lxitajb2z

#PiDay is coming up this week! To mark the occasion, why not: 🥧 Write a Pi-ku www.mathsweek.scot/n... 🥧 Make a Pi Day necklace or bracelet www.mathsweek.scot/n... 🥧 Check out some of our other suggestions for celebrating Pi Day! www.mathsweek.scot/n... #MathsWeekScot #MathsToday #UKMathsChat

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— Maths Week Scotland (@mathsweek.scot) March 11, 2025 at 4:00 AM

Some connections to Pi int the Library of Congress
Curriculum Tags: All
https://blogs.loc.gov/families/2025/03/pi-in-the-sky-on-earth-and-at-the-library-of-congress/

Primary (Pi-primary?) Source inspired images and activities #iTeachMath #PiDay blogs.loc.gov/families/202...

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— Ralph Pantozzi (@mathillustrated.bsky.social) March 14, 2025 at 4:30 PM

Pi Day activities, including those using Google Sheets
Curriculum Tags: All
https://www.controlaltachieve.com/2025/03/google-sheets-pi-day-projects.html

🥧 It's Pi Day! I pulled together some of my favorite EdTech activities for exploring, learning about, and creating with pi, including: 📈 Discover Pi with Google Sheets ✍️ Create "Pi Poems" 🏙️ Graph a Pi-Line Skyline www.controlaltachieve.com/2025/03/goog... #EduSky #EdTech

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— Eric Curts (@ericcurts.bsky.social) March 14, 2025 at 10:36 AM

It's always good to talk about inclusion, not just in math class, but in all classes

Curriculum Tags: All
https://www.sdsu.edu/news/2025/02/breaking-down-systemic-barriers-to-mathematics-success

And Recipient of the Dr. Angelo L. Tomaso Excellence in Dissertation Award from Rutgers! #iTeachMath

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— Ralph Pantozzi (@mathillustrated.bsky.social) March 10, 2025 at 11:19 AM

Empowering Students in math class
Curriculum Tags: All
https://news.fullerton.edu/2025/03/educator-empowers-students-to-become-the-math-teachers-they-needed/

“Some of the best math teachers I know had difficult experiences in their schooling. But now, they get to be the math teacher they needed as a child" #EduSky #iteachmath news.fullerton.edu/2025/03/educ...

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— Susan Carriker (@techknowmath.bsky.social) March 11, 2025 at 9:39 AM

Video Links

This year's @StandUpMaths Pi Day video (which includes @3Blue1Brown
Curriculum Tags: All
https://www.youtube.com/watch?v=vlUTlbZT4ig

Here is @3Blue1Brown's companion video 
Curriculum Tags: All
https://www.youtube.com/watch?v=6dTyOl1fmDo

And the original @3Blue1Brown video
Curriculum Tags: All
https://www.youtube.com/watch?v=HEfHFsfGXjs

A fun Pi Day coincidence
Curriculum Tags: All
https://x.com/howie_hua/status/1900616538090336645

Happy pi day! This one blew my mind when @aap03102 shared this. pic.twitter.com/Y1kVXdVZfV

— Howie Hua (@howie_hua) March 14, 2025

Here's a nice idea about using ordered lists in Desmos
Curriculum Tags: All
https://x.com/TimBrzezinski/status/1898361020512399383

Math teachers: One fun way to begin to get your students to THINK and WRITE more in math class is to have them create sentences using a @desmosclassroom ordered list. Quick 1:30 demo: https://t.co/EATbdrlAkp @Amplify @Desmos #MTBoS #ITeachMath pic.twitter.com/h7kOdIQuLW

— Tim Brzezinski (@TimBrzezinski) March 8, 2025

As always I like when he explains why the "trick" works
Curriculum Tags: All
https://x.com/howie_hua/status/1898725908057563296

The divisibility rule of 3 and why it works pic.twitter.com/rInc0MF6pJ

— Howie Hua (@howie_hua) March 9, 2025

A fun connection between these four numbers. Can you describe why this works? Are there other sets of four numbers that this will work for?
Curriculum Tags: MTH1W
https://x.com/MrJohnRowe/status/1900506929241182686

this is so cool.#iteachmath #mtbos #fractions #PiDay pic.twitter.com/pwltDTvFOv

— John Rowe 👨🏽‍🚀 (@MrJohnRowe) March 14, 2025

Thanks to @DianeDivine18 for this one for Pi Day
Curriculum Tags: All
https://www.youtube.com/watch?v=a6bT_DVwo7M

Image Links

A classic pizza connection to Pi
Curriculum Tags: Gr8
https://x.com/mathladyhazel/status/1900413955584966842

f you have a pizza with radius "z" and thickness "a", its volume is Pi(z•z)a. 😋 Happy Pi Day! pic.twitter.com/BhPKw8idxN

— Math Lady Hazel 🇦🇷 (@mathladyhazel) March 14, 2025

Math Links for Week Ending Feb 28th, 2025

Featured Links

I have always liked row games as a way to have a more interactive worksheet. The idea is that you have two columns of questions and you pair students up. Each student chooses a column and does all the questions in that column. They check their answers by seeing if they get the same value for their questions that are in the same row (even though they are different questions). They take some time and planning to create so it's always great when someone makes one (or some). Here are some that I've made.
Curriculum Tags: Gr7, Gr8
https://docs.google.com/presentation/d/1AdT58PRUnooWER3s8MZyidCt2wYxeOVXQMvnBb8I1bg/edit#slide=id.p

Anyone want to test a Row Game for me? 🤞 I don't trust my eyes anymore to find errors! 😬 I am hoping solutions in each level of the table match, enough info is given, and directions make sense. Thanks!#iteachmath #HRCEmathhttps://t.co/F3dxzqNRPH pic.twitter.com/3mMrwGyMcO

— JoAnn Sandford HRCE Math (@joann_sandford) February 27, 2025

Resource Links

Volume of solids in this newsletter. Nicely done
Curriculum Tags: Gr7, Gr8
https://drive.google.com/file/d/1n9CZsGNYZy5N5aLPBBGS2ckujqus2ekB/view

Check out the latest issue of Play...Persist...Prove, my newsletter for grade 8 math teachers. I hope you like it! drive.google.com/file/d/1n9CZ... #iteachmath

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— JoAnn Sandford (@jsandford.bsky.social) February 28, 2025 at 7:32 PM

Video/Audio Links

Year's ago we used to have a grade 12 math course where proofs were a fundamental part of the course. I loved that course. This would have been a good relationship for it. 
Curriculum Tags: All
https://x.com/TimBrzezinski/status/1895111023096389674

Triangle angle trisector surprise https://t.co/DVTyhk46L6 pic.twitter.com/6XMND6UGvB

— Tim Brzezinski (@TimBrzezinski) February 27, 2025

This would have been another great question for that proof course from the past. But now you could use it in our grade 9 course when you talk about properties of numbers.
Curriculum Tags: MTH1W
https://x.com/howie_hua/status/1894552333889286454

There are several ways to prove that sqrt(2) is irrational but this is my favorite way to explain it: pic.twitter.com/0uIrCRX4Bk

— Howie Hua (@howie_hua) February 26, 2025

What advice would you give your 1st year teacher self?

Curriculum Tags: All

https://talks.oame.on.ca/season-7

[New Podcast] This is our last episode of the season where we asked all of our guests "What advice would you give your 1st year teacher self?". Featuring @TheMathGuru @joboaler @NatBanting @LLB_315 @sig225 &more

Listen here: https://t.co/95KyYa01fu#MathChat #MTBoS #iTeachMath pic.twitter.com/1UNDNxCkY8

— OAMEtalks (@OAMEtalks) March 1, 2025

Image Links

I am always up for a good tessellation
Curriculum Tags: All
https://bsky.app/profile/tilefarmer.bsky.social/post/3lj4lvqpstc2u

Had lots of fun recreating a pattern @n-gons.bsky.social recently posted but with a minor twist using #TileFarm studio. I used two colors for clarity, but this is made using a single tile based on a geometric series of 30-60-90 triangles. #tessellation #iTeachMath #Math #MTBoS #mathart

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— Alex Romero (@tilefarmer.bsky.social) February 26, 2025 at 7:06 PM

Math Links for Week Ending Feb 9, 2024

Featured Links

It's not often I see some property I haven't seen before but given the amount of stuff that @TimBrzezinski puts out, it's not suprising that he shows me something new. 
Curriculum Tags: MTH1W
https://twitter.com/TimBrzezinski/status/1755201259408118041

⭕️ & equilateral triangle phenomenon https://t.co/Dj6ANYbo7M @geogebra @gogeometry #MTBoS #ITeachMath pic.twitter.com/I3ph3aiKwo

— Tim Brzezinski (@TimBrzezinski) February 7, 2024

Resource Links

Who doesn't need to learn about transcendental numbers
Curriculum Tags: MHF4U
https://karendcampe.wordpress.com/2024/02/07/exploring-e/

Happy e day! (2.7)

New blog post: "Exploring e" with some ideas for learning about the Euler number in math class. #MTBoS #iTeachMath #T3Learns #calculushttps://t.co/FGjtGezqrd

— Karen Campe (@KarenCampe) February 7, 2024

Where do you need math in everyday life?
Curriculum Tags: All
https://twitter.com/MathigonOrg/status/1754520352208679407

Mathematics has applications across so many parts of everyday life - from weather prediction to bridge design, crowd control to music shuffling, and fraud detection, to name a few. Explore many more interesting examples at https://t.co/R1xGBJ8WPN pic.twitter.com/Mjc7hiyfuB

— Mathigon (@MathigonOrg) February 5, 2024

Do you need to find a prime number? How about this method?
Curriculum Tags: All
https://twitter.com/MathigonOrg/status/1754882734411948267

The Sieve of Eratosthenes is a simple method for finding prime numbers: you highlight the next available number and then cross out all of its multiples. How many primes are there less than 100? Try for yourself at https://t.co/Mr65qdpphj pic.twitter.com/qi4UDzE5zq

— Mathigon (@MathigonOrg) February 6, 2024

Video Links

Have you ever thought of what you could do if you could break an algebra tile?
Curriculum Tags: MPM2D, MFM2P
https://twitter.com/TimBrzezinski/status/1754120652020212228

Completing the square in Polypad : Even when the B coefficient is ODD @MathigonOrg @desmosclassroom @Amplify #MTBoS #ITeachMath pic.twitter.com/q48uAooh0H

— Tim Brzezinski (@TimBrzezinski) February 4, 2024

You might have seen the rectangle version of this but how about the triangle version?
Curriculum Tags: Gr8

https://twitter.com/TimBrzezinski/status/1754258083369341387

Pushing the boundaries with circles in @MathigonOrg #Polypad: https://t.co/TCowI1LLz7 @desmosclassroom @Amplify #MTBoS #ITeachMath pic.twitter.com/XVaw0yFY0Y

— Tim Brzezinski (@TimBrzezinski) February 4, 2024

Students often struggle with combinatorics, so it is always good when something can be explained clearly
Curriculum Tags: MDM4U
https://twitter.com/howie_hua/status/1755744864757862570

Have you ever wondered what's happening in the permutation and combination formulas? Here's how we can think about them: pic.twitter.com/LzQklkmSle

— Howie Hua (@howie_hua) February 9, 2024

This is the third #OAME2024 preview episode
Curriculum Tags: All
https://twitter.com/OAMEtalks/status/1754636573402947603

Image Links

I am always looking at what parts of docudramas are true.  This is a neat data visualization to represent that
Curriculum Tags: MDM4U
https://twitter.com/infobeautiful/status/1753462035491274798

Great films fact-checked and visualised scene by scene. Is there really such a thing as a "true" true story in Hollywood?

Explore: https://t.co/pBn4cnSGWG pic.twitter.com/ME10rkZ4h8

— Information is Beautiful (@infobeautiful) February 2, 2024

What a great data visualization

Curriculum Tags: All
https://twitter.com/jennalaib/status/1754561880985686066

Love this, from @ferdiocom https://t.co/9VR6DmgiGd pic.twitter.com/0aj2JqoLKQ

— Jenna Laib (@jennalaib) February 5, 2024

Math Links for Week Ending Jan 12th, 2024

Featured Links

I'm a big fan of @DesmosClassroom and have made my fair share of activities. However, for Ontario teachers I have compiled a list of Desmos activities (mostly made by Desmos but some by me and others) that match the expectations for Ontario Gr 7-12 math curriculum. I did this a while ago but just recently finally put together 70 activities that hit most of the MTH1W. curriculum. So, you can find all of these activities at the page listed below. Note that the idea here is that you wouldn't do all of these activities as there is much overlap but pick and choose things that resonate with you.
Curriculum Tags: All
https://ontariomath.blogspot.com/p/ontario-online-math.html

[Updated Page] Ontario #math teachers, check out my connections of @desmosclassroom activities to our Gr7-12 math curriculum including (finally) over 70 activities directly linked to the new Gr9 MTH1W course. https://t.co/u0Otv87tcy#MathChat #MTBoS #iTeachMath pic.twitter.com/0FYBBqr6v7

— David Petro (@davidpetro314) January 10, 2024

Resource Links

I love this mashup of visual patterns, VNPS and Desmos. Perfect for connecting visual patterns to linear relationships
Curriculum Tags: MTH1W
https://mrcorleymath.wordpress.com/2024/01/08/arithmetic-sequences-with-visual-patterns-vnps-desmos/

OK, here is the blog post. A little rushed, but you know...#iteachmath #mtbos #visualpatterns #vnps @Desmos @fawnpnguyen https://t.co/zXN1F6edTY https://t.co/M6aoC4gpfu

— Nick Corley (@MrCorleyMath) January 8, 2024

There are some great ideas in this newsletter of math activities about 2D and 3D measurement. I like the Oops I forgot activity the best. 
Curriculum Tags: Gr8, MTH1W, MFM2P
https://drive.google.com/file/d/1wCzjqLA3VANVX3SI_F5s4OuZi78K46Xj/view

Anyone working in the grade 8 measurement unit? Check out the latest issue of Play...Persist...Prove.
Here's the link:https://t.co/2VavHfgj0h#HRCEmath #iteachmath #mtbos #mathchat pic.twitter.com/izssMUSnAr

— JoAnn Sandford HRCE Math (@joann_sandford) January 8, 2024

Video Links

I think this sentiment is true of students in all subjects but math especially
Curriculum Tags: All
https://twitter.com/LieslMcconchie/status/1745093406093664542

“There is no such thing as an unmotivated student.” - the quote that transformed how I view motivation. pic.twitter.com/83aWr666V6

— Liesl McConchie (@LieslMcconchie) January 10, 2024

Logarithms can be tricky but this may help in introducing them
Curriculum Tags: MHF4U
https://twitter.com/howie_hua/status/1743644076744855710

A quick introduction to evaluating logarithms pic.twitter.com/G0COvcuQxY

— Howie Hua (@howie_hua) January 6, 2024

The stuntmen who designed this stunt had to have some secret parabola knowledge.

Curriculum Tags: MFM2P, MPM2D, MCR3U, MCF3M, MBF3C

https://twitter.com/historyinmemes/status/1743329975279706495

During the filming of "The Man With the Golden Gun" in 1974, stuntman Loren "Bumps" Willert executed a corkscrew flip in an AMC Hornet X. The stunt, a groundbreaking endeavor, was meticulously planned and tested with computer simulations for the first time ever, conducted by the… pic.twitter.com/CuRt0EkWM0

— Historic Vids (@historyinmemes) January 5, 2024

I like these two tips from @Howie_Hua on how to make small changes in your class to bring big impacts
Curriculum Tags: All
https://twitter.com/howie_hua/status/1743073125997428775
https://twitter.com/howie_hua/status/1743404878771503532

Small changes, big impacts in the classroom part 1: Test Talk.

For the first 5 minutes of a test, students put their writing utensils on the ground, I hand out the test, and students talk to each other about the test. Many have mentioned how much this lowers their test anxiety. pic.twitter.com/5oOsTVZ2Ip

— Howie Hua (@howie_hua) January 5, 2024

Small changes, big impacts part 2: Here's how I turned one of my most boring math lessons into one of my most engaging ones pic.twitter.com/4FOqDLcJyk

— Howie Hua (@howie_hua) January 5, 2024

Image Links

I think that this is a great question for both kids who are beginning their journey of solving equations as well as those who are looking for a challenge. 
Curriculum Tags: MTH1W
https://twitter.com/H0H0v/status/1745103563733213221

x = ? pic.twitter.com/zUTsUo2v0F

— KHALID (@H0H0v) January 10, 2024

I like that he refers to this as a Joy Division graph. Regardless, its a great set of data to elicit discussion.

Curriculum Tags: MDM4U
https://twitter.com/ErwanRivault/status/1744704494783402378

NEW: 2023 has just been confirmed as the warmest year on record. The second half of the year saw record numbers of new daily highs.

We used a Joy Division plot to visualise daily temperature anomalies since 1940 to show how different 2023 has been pic.twitter.com/XI6xT6M1xh

— Erwan Rivault (@ErwanRivault) January 9, 2024

I think it would be great to do one of these for Math 
Curriculum Tags: All
https://twitter.com/Rainmaker1973/status/1744763936019222726

A brief history of physics

― Zach Weinersmith, Science: Abridged Beyond the Point of Usefulness pic.twitter.com/uwUqWW3n3r

— Massimo (@Rainmaker1973) January 9, 2024

Seems like a great starter
Curriculum Tags: All
https://twitter.com/aap03102/status/1743392373147668585

1017 times bigger than your phone?

Seems like a perfect lesson starter, Maths teachers! pic.twitter.com/XJCgF8Gdmc

— Chris Smith MBE (@aap03102) January 5, 2024

Math Links for Week Ending Dec. 22nd, 2023

Featured Links

I like when @Howie_Hua shows interesting examples from math class but he also teaches pre service teachers and so I like it when he gives tips about teaching. 
Curriculum Tags: All
https://twitter.com/howie_hua/status/1736390112173535268

Here are two things students appreciated in my math course, along with some of my favorite teacher moves, just in case it helps someone out pic.twitter.com/L0FgxI2QfQ

— Howie Hua (@howie_hua) December 17, 2023

Resource Links

This may be an oldie and Christmas may be over when it comes to school but tuck this away until next year.
Curriculum Tags: All
https://mathequalslove.net/must-share-math-y-christmas-ideas/

Video Links

This animation about the area of a circle never gets old
Curriculum Tags: Gr8
https://twitter.com/TimBrzezinski/status/1736393629785100628

Area of a circle (v2) https://t.co/xKtSvo44d7 pic.twitter.com/oFp5ZfN7G3

— Tim Brzezinski (@TimBrzezinski) December 17, 2023

Image Links

Something great for linear relations
Curriculum Tags: MTH1W
https://twitter.com/H0H0v/status/1736373380322853314

#math pic.twitter.com/6iIWcT2lTQ

— KHALID (@H0H0v) December 17, 2023

This really isn't math but I still think it's relevant in any class
Curriculum Tags: All
https://twitter.com/Rainmaker1973/status/1736381137683972578

Interestingly, our brains construct an incredibly complex jigsaw puzzles using any pieces it can get access to. These are provided by the context in which we see them and by our memories

Reading this may result hard at first, but then...

[read more: https://t.co/m7M9ocryeb] pic.twitter.com/5QWj34wVa2

— Massimo (@Rainmaker1973) December 17, 2023

I remember there was time that I wouldn't get this because I didn't know how to pronounce Euler
Curriculum Tags: All

https://twitter.com/howie_hua/status/1736519469441466863

You've heard of elf on the shelf but have you heard of pic.twitter.com/yNkDLTGxBl

— Howie Hua (@howie_hua) December 17, 2023

Something to use when you are teaching about infinite series
Curriculum Tags: MCR3U, MHF4U

https://twitter.com/mathladyhazel/status/1736829526108217390

This seems true. 😵‍💫 pic.twitter.com/bmmeuP3J6B

— Math Lady Hazel 🇦🇷 (@mathladyhazel) December 18, 2023

    

Math Links for Week Ending Jan. 6th, 2023

Featured Links

Hey, guess what? It's 2023. And here are a bunch of things related to the number 2023
Curriculumn Tags: All
https://twitter.com/edsouthall/status/1608874752709627911
https://twitter.com/TamasGorbe/status/1609112122411163648
https://twitter.com/MathsEdIdeas/status/1607869145231630343
https://twitter.com/JohnAllenPaulos/status/1609312453887954944

2023:
There are 2023 ways to tile a 4 × 4 square with an L-shaped tromino and the monomino. They’re all in this image (zoom in). pic.twitter.com/pcbhcwm0oo

— Ed Southall (@edsouthall) December 30, 2022

Happy Cube Year Everyone! 🥳
2️0️2️3️

Just two more years and we have a beautiful sum of cubes.#HappyNewYear2023 pic.twitter.com/ObzUXhWKSh

— Tamás Görbe (@TamasGorbe) December 31, 2022

2023 is the only number that is equal to the sum of its digits multiplied by the square of the sum of the squares of its digits, where the sum of its digits and the sum of the squares of its digits are also its prime factors.#HappyNewYear#HappyNewYear2023 pic.twitter.com/fHnd6nEQhp

— Maths Ed (@MathsEdIdeas) December 27, 2022

The number 2023 may seem rather undistinguished, but its prime decomposition is interesting. It contains three (lucky) 7s and two 1s: 7*17*17, which of course portends ........... nothing. In any case, Happy 2023!

— John Allen Paulos (@JohnAllenPaulos) December 31, 2022

Resource Links

Here's a new(ish) app that is based on the four fours problem. Good practice for order of operations
Curriculum Tags: All
https://fourequalsten.app/

@KarenCampe continues to post old NCTM calendar problems. This set comes from January of 1991
Curriculum Tags: All
https://karendcampe.wordpress.com/2023/01/01/january-calendar-problems/

Video/Audio Links

A little chat about coding in grade 9 math
Curriculum Tags: MTH1W
https://talks.oame.on.ca/season-5



Here's a nice little introduction to what a vector is from the movie Despicable Me. Thanks to @MathsJem for pointing this one out.
Curriculum Tags: MCV4U
https://www.youtube.com/watch?v=bOIe0DIMbI8

Here's a nice extension to Pythagorean Theorem
Curriculum Tags: Gr8, MTH1W, MFM2P, MPM2D
https://twitter.com/howie_hua/status/1610426715993681921

New TikTok video: Did you know there's a 3-d version of the Pythagorean theorem? pic.twitter.com/Q7UdNjMMoG

— Howie Hua (@howie_hua) January 4, 2023

Here's a nice basic algebra quiz. How many of your students will get all of these?
Curriculum Tags: MTH1W
https://twitter.com/howie_hua/status/1610802367607484416

New TikTok video: Just in case anyone wants a pop quiz on algebra pic.twitter.com/Vkou0tKybG

— Howie Hua (@howie_hua) January 5, 2023

A little augmented reality to spice up your Angle Sum Triangle Theorem
Curriculum Tags: Gr7, Gr8
https://twitter.com/TimBrzezinski/status/1610446710685466626

Triangle angle sum theorem — this time in augmented reality! https://t.co/1NcVILhg5M & https://t.co/WPS4smtab6 @geogebra #MTBoS #ITeachMath #geometry pic.twitter.com/BK0To0erLt

— Tim Brzezinski (@TimBrzezinski) January 4, 2023

Image Links

Part of a circle anyone?
Curriculum Tags: Gr8
https://twitter.com/KH2020H0/status/1610679344447328276

What is the area of the unshaded region of the square? pic.twitter.com/fo6srETZS0

— KHALID (@KH2020H0) January 4, 2023

Math Links for Week Ending Nov 25th, 2022

Featured Links 

I'm not sure what @JRappaport27 is drinking but he's been steadily putting out quality stuff. Check out this sequence of tasks leading up to adding fractions. You can download all 78 slides at the link below:
Curriculum Tags: Gr7, Gr8
https://twitter.com/JRappaport27/status/1595145551401869313

Here's a draft of a sequence of 6 tasks. Included in the speaker notes are sample hints/prompts to support/challenge/extend thinking, sample teacher moves and assessment considerations. Feedback always appreciated :) @pgliljedahl @MrValencia24 @KirstDy https://t.co/bZ1krAsz6z pic.twitter.com/B66qn3DivI

— Jordan Rappaport (@JRappaport27) November 22, 2022

Resource Links 

In this sequence @MSBJacobs shows that you don't have to create lessons with a lot of moving parts to have students develop understanding. In this case, we are looking at algebraic expressions with a combination of virtual tiles and vertical surfaces. Check out the entire thread here:
Gr7, Gr8, MTH1W
https://twitter.com/msbjacobs/status/1595164255070085120

I tried this activity in @MsLyon16 's MTH1W class using Polypad on @MathigonOrg to help illustrate algebraic expressions. First Q: if this is x + 2 what would 3(x+2) look like? Students go to the VNPS to work in small groups: pic.twitter.com/H4EOyLnLvF

— Michael Jacobs (@msbjacobs) November 22, 2022

Video Links 

Having just done a workshop at NCTM about visualizing multiplying and dividing fractions (https://bit.ly/nctm2022petro), I totally resonate with this post.
Curriculum Tags: Gr7, Gr8
https://twitter.com/howie_hua/status/1594017134278893568

New TikTok video: How do we VISUALLY show why we flip the second and multiply when dividing fractions? pic.twitter.com/HEAVjFk0pf

— Howie Hua (@howie_hua) November 19, 2022

Nice visualization of half life
Curriculum Tags: MCR3U, MHF4U
https://twitter.com/TimBrzezinski/status/1593976532023877632

Half-life function illustrated. Notice the half-life of substance does not depend on the initial amount! https://t.co/S3qyxae5sJ & https://t.co/l9VfJbcTjd @geogebra #MTBoS #ITeachMath #math #mathchat pic.twitter.com/fmoFQwDsVx

— Tim Brzezinski (@TimBrzezinski) November 19, 2022

Image Links 

Even if you are not a fan of Pokemon, you may like this quick reminder of 8 practices all math students should engage in
Curriculum Tags: All
https://twitter.com/howie_hua/status/1594813942748311553

8 Mathematical Practices meme pic.twitter.com/bIYmq75dZY

— Howie Hua (@howie_hua) November 21, 2022

What's the minimum/maximum number of calculations needed to find the blue area?
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/KH2020H0/status/1593740152798576640

What is the area of the region shaded in blue?
The below figure is a square of perimeter 24 cm. pic.twitter.com/psv7l1oVwY

— KHALID (@KH2020H0) November 18, 2022

Thank you IKEA
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/mathillustrated/status/1593074964155858944

Still one of my favorite #geometry pictures from @IKEAUSA #ITeachMath #ouch pic.twitter.com/BD5PpMTm1R

— Ralph Pantozzi (@mathillustrated) November 17, 2022

Math Links for Week Ending Nov. 4th, 2022

Featured Links

Are you looking for more reasons to try the #ThinkingClassroom then how about the sentiment of students who are experiencing it. 
Curriculum Tags: All
https://twitter.com/MaryBourassa/status/1587133458513551363

Why #ThinkingClassroom. A few responses when asked "What are your thoughts on this class?". Thank you @pgliljedahl for sharing your research with teachers and making it accessible. pic.twitter.com/8sn8vANvUQ

— Mary Bourassa (@MaryBourassa) October 31, 2022

Resource Links

If you follow @TimBrzezinski then you know that he is a master at making math based animations. And everyone has to start somewhere. 
Curriculum Tags: Gr7, Gr8
https://twitter.com/TimBrzezinski/status/1586521704096223232

Here’s the very first complex @geogebra animation I ever made. It was about 6 years ago. Took forever. Looking back, it’s still one of my favorites. https://t.co/mFsRWnEK5z & https://t.co/1qXNSPgnYq #MTBoS #ITeachMath #geometry pic.twitter.com/ctGVytoQLX

— Tim Brzezinski (@TimBrzezinski) October 30, 2022

Who doesn't like playing with Fractals?
Curriculum Tags: All
https://twitter.com/MathTechCoach/status/1586747251711410176

Enjoy this Fractal Dragon in @GeoGEbra. Make something you like, take a screenshot, and post a pic!https://t.co/5rAexY5jbt pic.twitter.com/HlO5I5KZoI

— Steve Phelps (@MathTechCoach) October 30, 2022

Video Links

I may be biased but I thought fellow Canadian @NatBanting's Ignite session was the best of the lot this year at #NCTMLA22. Now Thanks to @KirstDy's bootleg copy, you can see why
Curriculum Tags: All
http://natbanting.com/nctm-la-ignite/

Image Links

I've never heard of "adding one" as the camel principal. But there is a nice story in the thread for this important math tool. 
Curriculum Tags: All
https://twitter.com/TivadarDanka/status/1588131890040434688

Behold one of the mightiest tools in mathematics: the camel principle.

I am dead serious. Deep down, this tiny rule is the cog in many methods. Ones that you use every day.

Here is what it is, how it works, and why it is essential. pic.twitter.com/cevNDm2ASe

— Tivadar Danka (@TivadarDanka) November 3, 2022

This is like a "lite" version of @NatBanting's #MenuMath. Either way you should be able to get responses from students of all abilities. 
Curriculum Tags: Gr7, Gr8
https://twitter.com/JRappaport27/status/1588173149484781568

The idea is students create their own, build it, then have others solve. Interested to see what folks can come up with. Would love to see some pictures with cuisenaire rods. @KirstDy @NatBanting @pgliljedahl @BurdessAlicia @Mathgarden @DanShuster @shskaercher @davidpetro314 pic.twitter.com/qu8rfItCrH

— Jordan Rappaport (@JRappaport27) November 3, 2022

Here's a good starter for kids who have been doing area for a while or a challenge to those who are new at it. 
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/dment37/status/1586632995892613121

Blue area? @geogebra #geogebra pic.twitter.com/3w9Z3GHgER

— Daniel Mentrard (@dment37) October 30, 2022

    

Math Links for Week Ending Sept. 23rd, 2022

Featured Links

Next Friday I'll be speaking at #NCTMLA22. I am looking forward to talking about visualizing multiplying and dividing fractions. If you are in town, come on down and say hello. 
Curriculum Tags: Gr7, Gr8

Coming to #NCTMLA22? Start your day on Friday by checking out my session on using @desmosclassroom and @MathigonOrg's #PolyPad to visualize multiplying and dividing #fractions at 8am in Petree C#MathChat #MTBoS #iTeachMath pic.twitter.com/47ssqaUg2P

— David Petro (@davidpetro314) September 23, 2022

Resource Links

I always appreciate when someone curates the things that they find useful. I try to do that here, but there is so much that people share. In this case, @Pierre_Tranche has pared that down into the best of the best for you. 

Curriculum Tags: All
https://sites.google.com/view/mathywebsites/

For those interested, I have added a new section of some of favourite #ThinkingClassroom problem collections to my site of mathy resources.

h/t to @dhabecker @BurdessAlicia @webbkyle @MaeganGiroux https://t.co/27rZlhUvLT

— Pierre Tranchemontagne (@Pierre_Tranche) September 20, 2022

Video Links

I have been an advocate of doing this for years. In fact, I just talked about it today during a workshop I was giving. 
Curriculum Tags: All
https://twitter.com/howie_hua/status/1570194591227473921

New TikTok video: Here's what I do for the first 5 minutes of a test day pic.twitter.com/1JvpVcQjJz

— Howie Hua (@howie_hua) September 14, 2022

A rule is always better when it makes sense. 
Curriculum Tags: Gr7, Gr8

https://twitter.com/howie_hua/status/1571553473673703424

Can your students verify this is true?
Curriculum Tags: MTH1W
https://twitter.com/MagicPi2/status/1571393952539975682

Based on Pythagorean theorem#MTBoS #iteachmath #Math #maths pic.twitter.com/pqUgJgNhuB

— Idan Tal (@MagicPi2) September 18, 2022

This is a great area of polygons question

Curriculum Tags: Gr7, Gr8, MTH1W

https://twitter.com/MagicPi2/status/1571048636662054913

pic.twitter.com/xPuDVSF3vd

— Idan Tal (@MagicPi2) September 17, 2022

Image Links

What a pattern. How would you prove it's correct?
Curriculum Tags: MCR3U, MHF4U, MCV4U
https://twitter.com/pickover/status/1571222343548018692

Mathematics.

Shiver in ecstasy. Square root of 5. https://t.co/DANvUTYJVT
pic.twitter.com/IOKYdG91mb

— Cliff Pickover (@pickover) September 17, 2022

Here's that function meme you were looking for
Curriculum Tags: MCR3U, MCF3M
https://twitter.com/TheErickLee/status/1571270014585524225

Inspired by @merryfwilliams to make a function composition meme of my own. Alligators and Crocs! #ITeachMath #MTBoS https://t.co/kBkIGUBsqq pic.twitter.com/Dsk5XwdweZ

— Erick Lee HRCE Math (@TheErickLee) September 17, 2022

    

Math Links for Week Ending Aug 5th, 2022

Featured Links

I know that Henri has suggested that his post where he speaks of going full force with technology as "controversial", but I think maybe just for traditionalists. There are whole banks of math teachers that think that math is just about solving equations but I like these two quotes to give you a sense of where he is going: "Many math educators consider the solving of linear equations to be the heart of algebra. The topic is often introduced early, atomized into many special cases (one-step, two-step, etc.), and the subject of endless mind-numbing practice. For many students, this carries little meaning, other than “I’m supposed to get x by itself”" and "But note that of all the conceivable equations, only linear and quadratic equations can be solved with paper and pencil. If exponential, trigonometric, or logarithmic expressions are involved, Algebra 1 techniques are useless." Check it out yourself here
Curriculum Tags: All
https://blog.mathed.page/2022/08/04/technology-in-math-education/

New post, possibly controversial: going all in on techhttps://t.co/5bdxPz3bDH#mtbos #iteachmath #mathed pic.twitter.com/VnnhjtTOzu

— Henri Picciotto (@hpicciotto) August 4, 2022

Resource Links

If you are doing any work on working with equations (Eg, subbing values in) then this equation about measuring "good value" might be a great conversation starter too. 
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/tomrocksmaths/status/1554101589719252999

My formula for good value has been picked up by @DailyMirror - give it a go for yourself to see what is, and isn't, good value. Full article at the link below.

Formula based on research from @Plusnet in celebration of Yorkshire Day (August 1st). https://t.co/owx4jJGs7D

— Dr Tom Crawford (@tomrocksmaths) August 1, 2022

Video Links

If you are doing any work with area of quadrilaterals then this might be a great problem to work on and if you want to get kids started, here is a triangle only version using Desmos Geometry.
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/MagicPi2/status/1554007752149811200

pic.twitter.com/wYbgRm5UX8

— Idan Tal (@MagicPi2) August 1, 2022

Image Links

Week 8 of #MathPhoto22 is all about #angles
Curriculum Tags: All
https://twitter.com/meganisalanis/status/1554920041912487936

Kia ora koutou, hi everyone - this week's #MathPhoto22 is all about #angles (I'm from New Zealand and the te reo Māori word for angle is koki).

The photos so far each week have been fantastic! What a great way to connect, find and share ideas with a keen group of people. pic.twitter.com/Eu1rSWINuP

— Megan Me-Wi (@meganisalanis) August 3, 2022

Math Links for Week Ending Jul. 8th, 2022

Featured Links

Make sure you follow the whole thread to see how he creates his own custom tile via #Polypad 
Curriculum Tags: All
https://twitter.com/Trianglemancsd/status/1545087885115891718

Here is one of my favorite specialty tiles from the deep triangleman archives. pic.twitter.com/vg2Rqpci6g

— Christopher Danielson (@Trianglemancsd) July 7, 2022

Resource Links

Some proportional reasoning and area of trapezoid resources (among other things) listed here
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/mathsjem/status/1543516195332161537

New! My 159th gems post. Ideas, resources and updates for maths teachers. 💎

Hat tips to follow!https://t.co/KyceMJ6MLp#mathsgems #teammaths #mathschat pic.twitter.com/tXAfWpqDI4

— Jo Morgan (@mathsjem) July 3, 2022

A nice pile of Thinking Classroom resources including stuff specifically for MTH1W
Curriculum Tags:

Gr7, Gr8, MTH1W

https://drive.google.com/drive/folders/1TS_8U1ZJFJ-3zRwcD2RHH1-In5ttA74b

Thanks to the generosity of others who have shared thinking tasks, I've been able to catalogue what's been shared and what I've accumulated over time. I've added the link below to give access. #mtbos @KirstDy @NolanFossum @pearse_margie @Sneffleupagus https://t.co/6pBnWpauio pic.twitter.com/NJA5fUfF9b

— Jordan Rappaport (@JRappaport27) September 17, 2021

A new fraction based question every day. Check them all out
Curriculum Tags: Gr7, Gr8, MTH1W

http://fractle.me/

Breaking News: Fractles have now been viewed 10,000 times! See what all the fraction fun’s about at https://t.co/CE3YoYXMfv #mtbos #iteachmath #maths pic.twitter.com/9vuobiwvsb

— Steven Greenstein (@Psyclist) July 3, 2022

I have seen many of these visual proof's of the angle sum triangle theorem (I've made a few myself) but I kinda like this one where the corners are physically removed.
Curriculum Tags: Gr7, Gr8
https://twitter.com/TimBrzezinski/status/1544481117314637827

Triangle interior angles: Alternate exploration. Made with @geogebra : https://t.co/6IWd8a4XmW #MTBoS #ITeachMath #math #MathChat #GeomChat #geometry pic.twitter.com/Ag69M157IR

— Tim Brzezinski (@TimBrzezinski) July 6, 2022

I love that these Ontario Gr7&8 Thinking Classroom tasks are broken down by expectation and by difficulty
Curriculum Tags: Gr7, Gr8
https://twitter.com/GLewisOCT/status/1544713785918750722

After #OAME2022 @pgliljedahl's Fireside Chat, Peter said pre-created #MildMediumSpicy #Assessment charts help provide access to #ThinkingClassroom. @EHorbay challenged us w/ #Transformations @BartVanslack. Here's🔗Gr7: https://t.co/v3VOKFhIZV and 🔗Gr8: https://t.co/HhDabxYkw0 pic.twitter.com/LBdaiJ7lDc

— Gerard Lewis, OCT (@GLewisOCT) July 6, 2022

Video Links

I was reminded of this nice visualization from @MagicPi2
Curriculum Tags: MTH1W
https://twitter.com/SteveStuWill/status/1544088845079089152

Visual proof that the exterior angles of a polygon add up to 360 degrees. 👍

Credit: @MagicPi2 https://t.co/H13V7wOPaN pic.twitter.com/1gzdYRBMWM

— Steve Stewart-Williams (@SteveStuWill) July 4, 2022

Image Links

Way back when I was a kid and there were only rectangular Legos, most of mine were red and white
Curriculum Tags: All
https://twitter.com/simongerman600/status/1543596683690393601

Cool chart by @neilrkaye shows the distribution of brick colours in the current Lego sets. Are the Star Wars sets the reason for the black and white dominance? pic.twitter.com/tXqAzo68iy

— Simon Kuestenmacher (@simongerman600) July 3, 2022

They both look like they could be kites but you have to employ a bit of Pythagorus' theorem to figure out which.
Curriculum Tags: Gr8

https://twitter.com/StudyMaths/status/1544403600792772609

Which, if any, is a kite? pic.twitter.com/veOy9pPyad

— Jonathan Hall (@StudyMaths) July 5, 2022

This week's #MathPhoto22 is all about #Estimation
Curriculum Tags: All
https://twitter.com/mary_mauger/status/1545004247628091392

"Welcome to Week 5 of #MathPhoto22! This week, we’re looking for images and situations that encourage #estimation. Take photos & share to Twitter using hashtags #MathPhoto22 and #estimation. #MTBoS #iTeachMath #estimation180 pic.twitter.com/JdkRBAtO9n

— Mary Auger☮️ (@mary_mauger) July 7, 2022

    

Math Links for Week Ending June 3rd, 2022

Featured Links

This is not the first time I have shared this resource (and I will probably share it again) but I really love it and think it's good to get a reminder of it. It's an article titled "Never say anything a kid could say" and it basically about the different ways that you can stop telling stuff in your class and move to a classroom environment where kids do all the telling. It's a great read. Thanks to @RobertKaplinski for sharing this again. 
Curriculum Tags: All
https://robertkaplinsky.com/never-say-anything-a-kid-can-say/

The article Never Say Anything A Kid Can Say was pivotal in my career because it made my struggles feel normal and gave me a path forward to improve. So, here's my love letter to Steve Reinhart's article: https://t.co/Cr4l6pi47W #MTBoS pic.twitter.com/oLIL7E86JW

— Robert Kaplinsky (@robertkaplinsky) June 2, 2022

Resource Links

This is just a reminder that if you ever have a student who asks to make a 3D model of their project, let them
Curriculum Tags: All
https://twitter.com/martinsean/status/1529922378230206464

A student emailed me and asked if they could do their spiral of Pythagoras project in 3D. Puzzled I said yeah. Here’s what they turned in. When you look from birds eye view it lines up with sketch on the wood! I asked her if I could keep it but they understandable want it back. pic.twitter.com/VvWVmGdd6q

— Martin Joyce (@martinsean) May 26, 2022

Definitely a challenge but still do able and it seems like there is more than one way to get the answer
Curriculum Tags: MTH1W
https://twitter.com/pickover/status/1530235001924726784

Mathematics and mystery.

Do we have sufficient information to find the angle x in this set of squares? https://t.co/7ApHQAAKC7

“Geometry aims at knowledge of the eternal.”
~ Plato, Republic, c. 380 BC pic.twitter.com/JRAGeJ0tha

— Cliff Pickover (@pickover) May 27, 2022

Video Links

So I don't know if you need to watch this whole video but the part that pertains to math is kinda neat. Though he doesn't say why this works. I think that you could use it as a way to show a specific practical connection to trig. You could start at 530 ish to get right to the math part. 
Curriculum Tags: MPM2D, MCR3U, MCF3M
https://youtu.be/LLWFHiShyJ4?t=328

A few from @Howie_Hua starting with this one on a property of multiples of 13
Curriculum Tags: Gr7, Gr8
https://twitter.com/howie_hua/status/1530228821999267840

New TikTok video: A cool pattern I didn't notice until recently pic.twitter.com/7Rr8Pcuo1J

— Howie Hua (@howie_hua) May 27, 2022

This is a nice little tweak to the way you interact with your kids by changing the way you ask "Do you have any Questions?"
Curriculum Tags: All
https://twitter.com/howie_hua/status/1532498839503925248

New TikTok video: Say "Ask me at least two questions" rather than "Do you have any questions?" pic.twitter.com/VkWm1imWGQ

— Howie Hua (@howie_hua) June 2, 2022

Connecting area to perimeter

Curriculum Tags: Gr7, Gr8

https://twitter.com/howie_hua/status/1532150582068228096

New TikTok video: My guess on why we think cutting sandwiches diagonally makes bigger pieces pic.twitter.com/UuYyPl9Jp7

— Howie Hua (@howie_hua) June 2, 2022

Even if you don't teach circle properties, there are probably many places you could fit in this property. And if you want, here is a dynamic Desmos version. 
Curriculum Tags: MTH1W
https://twitter.com/MagicPi2/status/1531928068008431618

pic.twitter.com/lwb0yJmY0I

— Idan Tal (@MagicPi2) June 1, 2022

Image Links

Yup, makes sense. 
Curriculum Tags: All
https://twitter.com/PabloCChristo/status/1530830940255178754

pic.twitter.com/WM0Eufz19z

— Pablo C Christo (@PabloCChristo) May 29, 2022

The horror
Curriculum Tags: MPM2D, MCR3U, MCF3M
https://twitter.com/howie_hua/status/1531797373520707584

When someone thinks sin(x)/x=sin: pic.twitter.com/hTzRaYx1h6

— Howie Hua (@howie_hua) June 1, 2022

A fraction clock to use as a math starter.
Curriculum Tags: Gr7, Gr8
https://twitter.com/MagicPi2/status/1532264256091078656

pic.twitter.com/rq9AD5Fzkg

— Idan Tal (@MagicPi2) June 2, 2022