Math Links for Week Ending Apr 18, 2025

Featured Links

It was always one of my favourite things to find something out in the wild that would connect to the curriculum I'm teaching and make students say "hmm". Make sure you check out the comments for the answer
Curriculum Tags: MPM2D, MFM2P
https://x.com/aledaklassen/status/1911424118336999774

Is there a place for this in #mth1w?https://t.co/YKQf409CAL

And... Is this true?! I don't drink coffee. #onted

— Aleda Klassen (@aledaklassen) April 13, 2025

Resource Links

I think it's important to find things that are thing that kids might be thinking of and making money on the Internet is definitely one of them.
Curriculum Tags: Gr7, Gr8, MTH1W
https://robertkaplinsky.com/work/how-much-money-do-you-earn-for-1000000-streams-on-spotify/

Looking for a real world context for multiplying and dividing decimals? Check out my problem-based lesson called How Much Money Do You Earn For 1,000,000 Streams On Spotify?
https://t.co/BULChRpJe8 pic.twitter.com/DvZqlCImV5

— Robert Kaplinsky (@robertkaplinsky) April 11, 2025

Video Links

I love a good sum of series but I also like the explanation of the conditions when this sum doesn't have an answer
Curriculum Tags: MCR3U
https://x.com/howie_hua/status/1913005710172164429

This pattern with infinite series is not a coincidence.

Also, 1+2+4+8+...=-1???

(I don't have a good title for this one but I think it's good lol) pic.twitter.com/ByLff6nErK

— Howie Hua (@howie_hua) April 17, 2025

The beauty of mathematics 
Curriculum Tags: All
https://x.com/mathladyhazel/status/1911616202448785610

Each line produces two new lines at an angle. When two collide they don't produce new ones. The result was a pleasant surprise. [https://t.co/PuUxRQRECR] pic.twitter.com/GTvb8mwpum

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

Image Links

I like this kind of question because it seems harder than it is but with a little care, it should be do able. Can you guess why this was published on the 18th?
Curriculum Tags: Gr8, MTH1W
https://bsky.app/profile/percybuttons3.bsky.social/post/3ln2wzqrjkq2f

Math Links for Week Ending Apr. 11th, 2025

Featured Links

I really like this problem because you can take a brute force method with skills as complex as those found in gr7 & 8 or take it all the way to Calculus. I threw my hat with a dynamic geometry solution here. 
Curriculum Tags: All
https://x.com/jamestanton/status/1908437200653468022

Warm up:
Where on the diagonal should the dot be placed so that the sum of areas of the two squares is as small as possible? pic.twitter.com/S51tNtmKJM

— James Tanton (@jamestanton) April 5, 2025

Resource Links

As a calculus teacher I always found I never had enough resources to teach related rates. 
Curriculum  Tags: MCV4U
https://bsky.app/profile/theericklee.bsky.social/post/3lm653o3o5s2w

I don't know what my students will think but I had a lot of fun making this problem. #ITeachMath teacher.desmos.com/activitybuil...

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— Erick Lee (@theericklee.bsky.social) April 6, 2025 at 3:02 PM

Video Links

I always like a good visual proof of an infinite series
Curriculum Tags: MCR3U, MHF4U, MCV4U
https://x.com/howie_hua/status/1910118057080725712

Finding 1/2 + 1/4 + 1/8 + 1/16 + ... by drawing: pic.twitter.com/8I1Q07xnTU

— Howie Hua (@howie_hua) April 9, 2025

I never get tired of this animation
Curriculum Tags: Gr8, MTH1W
https://x.com/Matematickcom/status/1910253679401185742

Beautiful visualization 👍 pic.twitter.com/gyi1L0B4TP

— Matematickcom (@Matematickcom) April 10, 2025

Image Links

Makes sense to me
Curriculum Tags: All
https://bsky.app/profile/motivickyle.bsky.social/post/3lm3jfmbdts24

From my kiddo's school's math event 😍 🧮

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— χle Ormsby (@motivickyle.bsky.social) April 5, 2025 at 2:04 PM

Math Links for Week Ending Apr 4th, 2025

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Even though we can't see the presentations, I think the summaries offer some good ideas. This one is my favourite: " Don't focus on getting info INTO students' brains, more on getting info OUT!". Check out the original post to see all of the 7 for 7 presentations at the TI conference. 
Curriculum Tags: All
https://bsky.app/profile/karencampe.bsky.social/post/3lljf4p47uc2j

Last not least @jgough Jill Gough: Visualization in a Language-Rich Mathematics Class Don't focus on getting info INTO students' brains, more on getting info OUT! What is the movie you are making in your mind? Verbalize/visuals for deep learning #T3Learns #T3IC #iTeachMath

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— Karen Campe (@karencampe.bsky.social) March 29, 2025 at 12:39 PM

Resource Links

Even though some of these are most certainly university level equations, there are definitely equations here that fit into the high school math (and physics) curriculum.
Curriculum Tags: All
https://www.businessinsider.com/17-equations-that-changed-the-world-2014-3

Ian Stewart shared what he calls '17 equations that changed the course of history' www.businessinsider.com/17-equations... ianstewartjoat.weebly.com/equations.html #mtbos #iteachmath #historyOfMath

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— Dilip Barman (@dbarman.bsky.social) April 2, 2025 at 1:12 AM

Here's a nice little applet to visualize normal vectors
Curriculum Tags: MCV4U
https://www.geogebra.org/u/daniel+mentrard

The angle between two planes is a angle
between their normal vectors
Visualization |Animation | Interactive applet@geogebrahttps://t.co/23BUle1Oxk
#geogebra #math #science #iteachmath #mtbos #visualization #elearning @bancoche #physics pic.twitter.com/2G4p3jI7fw

— Daniel Mentrard (@dment37) April 1, 2025

Video Links

I think this could be used when talking about number systems (in terms of triangle numbers) or to conceptualize the patterns that exist in (this particular) sequence. 
Curriculum Tags: MTH1W, MCR3U
https://x.com/howie_hua/status/1907217126634500392

1, 3, 6, 10, ... how can we find the 100th triangular number? pic.twitter.com/RUNgaC6iaV

— Howie Hua (@howie_hua) April 1, 2025

This is a neat visualization that never occurred to me. Try it with your students
Curriculum Tags: MTH1W, MPM2D
https://x.com/howie_hua/status/1908311966017589472

Did you know we can visualize rewriting square roots? I wish I was at least shown this in school. pic.twitter.com/gnTrMGSxQz

— Howie Hua (@howie_hua) April 5, 2025

I know these are simulations, but the math checks out and they would work IRL.
Curriculum Tags: All
https://x.com/mburnsmath/status/1908145074216763552

I love these. https://t.co/5k7rRKDumM

— Marilyn Burns (@mburnsmath) April 4, 2025

Image Links

This seems like the kind of question that has brute force solutions and more elegant solutions (and code based solutions). To me that makes it perfect for all grade levels. 
Curriculum Tags: All
https://bsky.app/profile/makeaproblem.bsky.social/post/3llonl6tnpc2h

Happy Monday! This problem is inspired by the 1971 Canadian Math Olympiad Q7 Which are there more of, 2-digit numbers that are divisible by their 10s digit, or 2-digit numbers that are divisible by their unit digit? #math #maths #ProblemSolving #iteachmath #mathsky

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— Durtles (@makeaproblem.bsky.social) March 31, 2025 at 11:15 AM

Math Links for Week Ending Mar 28th, 2025

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A long time ago I taught my daughter, who was in grade 3, how to differentiate simple polynomial functions just to show that just knowing an algorithm doesn't mean you understand the math. So this totally resonates with me. 
Curriculum Tags: All
https://x.com/howie_hua/status/1905059978907730276

My response to comments saying "Just teach the algorithm!" pic.twitter.com/Ixx2VCIUpq

— Howie Hua (@howie_hua) March 27, 2025

Resource Links

I like this type of activity because it takes a very real problem and connects it directly to a specific mathematical expectation.
Curriculum Tags: MCT4C, MCR3U, MAP4C

https://docs.google.com/presentation/d/1kgv_ji_ZWnZHMAlmw_rk_JZIxIyLiWcenCfTvfOzgMY/edit#slide=id.g3432336fed9_0_278

I spent way too long making this lesson on climate change and exponential decay. So, hopefully someone out there can use it. #MaththatMatters #iteachmath #mathstoday #mtbos Slides: docs.google.com/presentation... Task: docs.google.com/document/d/1...

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— Bryan Meyer (@doingmath.bsky.social) March 25, 2025 at 4:00 PM

There are some nice measurement and arithmetic sequence resources (among other things)
Curriculum Tags: All
https://www.resourceaholic.com/2025/03/5-maths-gems-188.html

New! My 188th gems post. Ideas, updates and resources for maths teachers. 💎https://t.co/fwwMtW6rTW#mathsgems #mathschat #teammaths #mathstlp #mathscpdchat pic.twitter.com/jk7EbmnHa1

— Jo Morgan (@mathsjem) March 23, 2025

There are always more graphs and @JennaLaib keeps them coming
Curriculum Tags: MDM4U

https://slowrevealgraphs.com/

New #SlowRevealGraph Additions!

Check out https://t.co/OhsfPtDqKx to explore
-How far can migrating animals travel in one day?
-How impressive was Chelsea FC's Cole Palmer's debut?
- How many 'living languages' are spoken in different countries? #MTBoS #ITeachMath pic.twitter.com/9a7qqTghQL

— Jenna Laib (@jennalaib) March 24, 2025

Video Links

You can do the same thing with @Desmos but I think there is nothing like a physical manipulative
Curriculum Tags: MPM2D, MCF3M, MCR3U, MBF3C

https://bsky.app/profile/scaffoldedmath.bsky.social/post/3llc4z75ogc2h

Graphing quadratics in vertex form #mathsky

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— scaffoldedmath.bsky.social (@scaffoldedmath.bsky.social) March 26, 2025 at 11:46 AM

A very topical percentage problem. 
Curriculum Tags: Gr8, Gr7, MTH1W, MAT1L , MAT2L

https://x.com/howie_hua/status/1905424336342974799

If the price of a car increased by 25% and the increased price is $36,000, what was the original price of the car? pic.twitter.com/8pXVHHO5qu

— Howie Hua (@howie_hua) March 28, 2025

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I have always loved this Calvin and Hobbs cartoon. I think even when I was much younger I think I recognized that this satirized the idea of what a "math person" is 

Curriculum Tags: All

https://bsky.app/profile/karencampe.bsky.social/post/3ll6b25hxgc2e

@jennalaib.bsky.social HERE IS THE COMIC I WAS THINKING OF!!! #iTeachMath

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— Karen Campe (@karencampe.bsky.social) March 24, 2025 at 10:48 PM

A perfect math starter
Curriculum Tags: All

https://bsky.app/profile/duanehabecker.com/post/3lkyonxp24q26

#RecreationalMath #iTeachMath #MathSky

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— Duane Habecker (@duanehabecker.com) March 22, 2025 at 5:35 PM

The latest #TapeDiagramTuesday post
Curriculum Tags: MTH1W
https://bsky.app/profile/duanehabecker.com/post/3ll7a5z5i2z2v

It's time for your #TapeDiagramTuesday extra challenge! Model your solution strategy with a tape diagram. Then share it with the community! #iTeachMath

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— Duane Habecker (@duanehabecker.com) March 25, 2025 at 8:05 AM

This is in the same vein as "Which one Doesn't Belong"
Curriculum Tags: MCR3U
https://x.com/StudyMaths/status/1905665653169598619

Try some values, then put the result back into the function. What do you notice?#1001MathsBots pic.twitter.com/pFq7R5Aaf7

— Jonathan Hall (@StudyMaths) March 28, 2025

Math Links for Week Ending Mar. 21st, 2025

Featured Links

The season finale of Severance went live tonight. If you are a fan then you will like this @Desmos creation
Curriculum Tags: All
https://x.com/Desmos/status/1902737247717187868

Your outie makes art...in Desmos.#severance #lumon pic.twitter.com/qYeCbbp25w

— Desmos (@Desmos) March 20, 2025

Resource Links

It's always good to see some good demos of how to use dynamic geometry software. In this case you have some choice. 
Curriculum Tags: MTH1W
https://karendcampe.wordpress.com/2025/03/16/go-for-geometry-5/

New blog post! "Marvelous Midsegments" Go For Geometry! Episode 5.
Activities exploring on all technology platforms: Desmos, GeoGebra & TI calculators.
Taking the scenic route 😉#geometry #MTBoS #iTeachMath #T3Learnshttps://t.co/O2hFX9YiAl

— Karen Campe (@KarenCampe) March 17, 2025

Some new ways to show points with @Desmos
Curriculum Tags: All
https://x.com/Desmos/status/1902088563707277475

So...what's your point?

Customize your points and text labels with new shapes and outline settings. Check out an example graph here: https://t.co/zaJpjSsBOx#mtbos #iteachmath #desmostips pic.twitter.com/3X05h5oii7

— Desmos (@Desmos) March 18, 2025

Video Links

I also remember when I first made this connection. 
Curriculum Tags: MPM2D, MFM2P, MCR3U, MCF3M, MBF3C
https://x.com/howie_hua/status/1902521844273705127

In high school, I didn't realize completing the square LITERALLY means to complete the square. Here's what I mean: pic.twitter.com/Sq4lT5KIoN

— Howie Hua (@howie_hua) March 20, 2025

Making Logarithmic properties make sense.
Curriculum Tags: MHF4U

https://x.com/howie_hua/status/1902890459774783796

In high school, I just memorized these logarithm rules for products and quotients. If you're curious why they work, here's why: pic.twitter.com/VyrZXT91n8

— Howie Hua (@howie_hua) March 21, 2025

I have seen this in so many forms but I don't think I've seen this version
Curriculum Tags: MCR3U, MHF4U
https://x.com/mathladyhazel/status/1902562029245726971

When a math person dances. pic.twitter.com/U1uF6Svhf0

— Math Lady Hazel 🇦🇷 (@mathladyhazel) March 20, 2025

Image Links

This might be a good example of an outlier
Curriculum Tags: MDM4U
https://bsky.app/profile/infobeautiful.bsky.social/post/3lkoul42ba424

Woah Australia - Global cancer rates in people under 50 Source: World Health Org

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— Information is Beautiful (@infobeautiful.bsky.social) March 18, 2025 at 7:55 PM

Math Links for Week Ending Mar 14th, 2025

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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 Mar 7th, 2025

Featured Links

It's not too late to join in to #mathartmarch
Curriculum Tags: All
https://bsky.app/profile/ayliean.bsky.social/post/3lje6cgmacs2u

Day 1 of #MathArtMarch thread Hop in and out of the challenge as you please! Do arty maths or mathsy art🌿 (I will now attempt to make a thread of today’s delights, but I’m not very Bluesky yet 👇)

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— Ayliean (@ayliean.bsky.social) March 1, 2025 at 7:24 PM

Resource Links

More classic NCTM calendar problems
Curriculum Tags: All
https://x.com/KarenCampe/status/1896195830266343908

March Calendar of Problems is posted! Try some #ProblemSolving #RecreationalMath & share thoughts here or on the blog.

Plus BONUS content article: "Math Habits of Mind" Enjoy!
Consider subscribing so never miss a post. #MTBoS #iTeachMath #T3Learnshttps://t.co/H54l9omTrV

— Karen Campe (@KarenCampe) March 2, 2025

I like this post from @MrJohnRowe about focussing on when students "stall" when problem solving or when they don't even start. "We need to do a better job at helping students with “Problem Starting” and be less obsessed with “Problem Solving”. We undoubtedly need to do a better job at normalising not knowing".We were just talking about this at my school. The idea that sometimes when students can't see a way to start right away, it becomes debilitating. 
Curriculum Tags: All
https://mrrowe.com/2025/02/28/when-problem-solving-leads-to-problem-stalling/

✏️ N E W B L O G P O S T ✏️

when problem solving leads to problem stallinghttps://t.co/o9sVv6Sg62#iteachmath #mtbos #math

— John Rowe 👨🏽‍🚀 (@MrJohnRowe) February 28, 2025

Get the teacher links to these Pi related activities below. I really like how they have treated Buffon's needle. 
Curriculum Tags: All
https://teacher.desmos.com/collection/671913a5fa1590c94746a14e?collections=651ca31cf69ee59aa9e3818a%2C655cea587755229b6385da85%2C66717e66f7e8f835ea059449

🥧 Looking to add a slice of fun to Pi Day on 3/14?

Check out our monthly challenges, freshly baked for K–5, middle school, and high school!

Join thousands of students nationwide:
🔗 K–5: https://t.co/WUCYcGFZCI
🔗 MS: https://t.co/DgEsMVfgFn
🔗 HS: https://t.co/2PwFnhGHHk pic.twitter.com/IcrArmMJuV

— Desmos Classroom (@desmosclassroom) March 4, 2025

I love this use of student work that @ddmeyer uses. These are easily grababble using the Snapshot feature in Desmos Classroom
Curriculum Tags: All
https://danmeyer.substack.com/p/how-to-turn-kids-into-the-curriculum

One of the powers is the Desmos Classroom platform is the snapshot tool. @ddmeyer.bsky.social discussing how to get the most out of your students and lessons. Lots of opportunities for this in the ADM curriculum. #iteachmath danmeyer.substack.com

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— Nick Corley (@mrcorleymath.bsky.social) March 5, 2025 at 2:38 PM

Video Links

I'm not a big fan of math tricks but I always love how @howie_hua explains how they work. This might be something to do in a beginning algebra course. 
Curriculum Tags: MTH1W
https://x.com/howie_hua/status/1896296316705370194

Two divisibility rules of 7 and why they work pic.twitter.com/tdcoSUOY4G

— Howie Hua (@howie_hua) March 2, 2025

It was cool to see this early video of Stephen Wolfram talking about Mathematica
Curriculum Tags: All
https://www.youtube.com/watch?v=MeuCAT5HDh0

I've been watching several numerical computing videos from the 1980s. Very cool that these are available. Here's Mathematica. #ITeachMath #mtbos youtu.be/MeuCAT5HDh0?...

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— Jed (@jedediyah.com) March 1, 2025 at 11:06 PM

Image Links

This is fun if you are dealing with imaginary numbers.
Curriculum Tags: MHF4U
https://x.com/howie_hua/status/1897748058043302023

https://t.co/4iQZsioiVv pic.twitter.com/GfFSM4RiFH

— Howie Hua (@howie_hua) March 6, 2025

Another cool tessellation
Curriculum Tags: All

https://bsky.app/profile/tilefarmer.bsky.social/post/3ljdc7jcejs2j

Here is another one of my favorites in this class of pattern. This is related to the truncated squares. #tessellation #iTeachMath #Math #TileFarm #mathart #archimedes

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— Alex Romero (@tilefarmer.bsky.social) March 1, 2025 at 11:02 AM