Math Links for Week Ending Dec 26, 2025

Featured Links

Who doesn't want some free resources?
Curriculum Tags: All
https://www.mathisfigureoutable.com/blog/12-days-of-christmas-math-is-figureoutable

That’s a wrap! 🎄
12 days of FREE resources to help students reason instead of memorize strategies, routines, and a reasoning workshop.
Catch them all here 👉 https://t.co/KBlampybXr#MathIsFigureOutAble #MTBoS #MathEd pic.twitter.com/OnGWjOAkyS

— Pam Harris (@pwharris) December 20, 2025

Resource Links

These are some big names in mathematics communication
Curriculum Tags: All
https://www.ams.org/journals/notices/202601/noti3285/noti3285.html

Reaching the Masses: Six Authors on Public Outreach [about Mathematics]

A Zoom conversation with:

Keith Devlin @MarcusduSautoy
Jordan Ellenberg
Sarah Hart @JohnAllenPaulos@stevenstrogatzhttps://t.co/34Ihrzpu40

PDF: https://t.co/dXmPesT92u pic.twitter.com/1eoecjzFFW

— Steven Strogatz (@stevenstrogatz) December 18, 2025

Video Links

A proof using triangle properties. 
Curriculum Tags: Gr8, MTH1W
https://x.com/howie_hua/status/2001750457216307290

One of the coolest math facts that I know is that the only circle that fits perfectly in a 3-4-5 right triangle has an area of pi.

Here's how we can prove this. pic.twitter.com/heVZTZon9a

— Howie Hua (@howie_hua) December 18, 2025

Working with repeating decimals? Then this may be fun
Curriculum Tags: Gr8, MTH1W
https://x.com/howie_hua/status/2002773397823201310

Can we all share a fun math fact we will never use in our life but we still think is cool? pic.twitter.com/DRMOFBugGP

— Howie Hua (@howie_hua) December 21, 2025

I love the connection to e. 
Curriculum Tags: MDM4U, MHF4U

https://x.com/howie_hua/status/2003510194555486736

What's the probability of no one grabbing their own name when picking secret Santas? (Spoiler alert: e appears here!) pic.twitter.com/kacvsy9vgb

— Howie Hua (@howie_hua) December 23, 2025

Image Links

A great class starter
Curriculum Tags: All
https://x.com/pickover/status/2001855140027077025

Mathematics. Perception. Geometry.

This problem is fascinating, because different humans seem to give different answers, and different AI entities seem to give different answers. pic.twitter.com/RJnXP9H4bO

— Cliff Pickover (@pickover) December 19, 2025

There is data everywhere
Curriculum Tags: MDM4U
https://x.com/YOW_Weather/status/2004169734636372053

#Ottawa white Christmases over the past 50 years (2025 edition) #YowWx #OttWeather #OttNews pic.twitter.com/5ROkB26pQo

— Ottawa Weather Records🌤 (@YOW_Weather) December 25, 2025

As someone who is over 55, I am not sure if I agree :-)
Curriculum Tags: MDM4U
https://x.com/SavagelyAvg/status/2004234582057796015

pic.twitter.com/0dXgAiD2zB

— SAVAGELY Average 🇺🇸 ✝ (@SavagelyAvg) December 25, 2025

Math Links for Week Ending Dec 19th, 2025

Featured Links

Who among us have no seen math students do this on the regular in class?
Curriculum Tags: All
https://x.com/mariana057/status/2001374920073449837

I don't always clear my calculator...

but when I do, I hit both 'C' and 'CE' a bunch of times because I don't know exactly what they do.

— mariana Z (@mariana057) December 17, 2025

Resource Links

Whether you are actually studying sums of series or just having students work with number patterns, this is a good way to go about it. 
Curriculum Tags: MTH1W, MCR3U
https://fawnnguyen.substack.com/p/find-the-smallest-sum





Flex you or your student's @Desmos muscles 
Curriculum Tags: All
https://bsky.app/profile/desmos.com/post/3maen3ia6ak27

Have some free time over the next couple weeks? You have less than a month to submit your work to the Desmos Art Contest! Head to desmos.com/art for more information, and be sure to hit submit before January 15th, 2026. #mathsky #iteachmath

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— Desmos Studio (@desmos.com) December 19, 2025 at 4:28 PM

Video Links

Some nice trig related visuals
Curriculum Tags: MCR3U, MCF3M
https://x.com/InterestingSTEM/status/2000944015404056826

Trigonometric patterns explained.pic.twitter.com/eF4JBwh86J

— Interesting STEM (@InterestingSTEM) December 16, 2025

I like how in this question you could use systems of equations but you could also use logic
Curriculum Tags: MPM2D, MFM2P
https://x.com/howie_hua/status/1999526011814211709

What is the weight of the dog, cat, and bunny? pic.twitter.com/1dcYFlZDKa

— Howie Hua (@howie_hua) December 12, 2025

This is a good example of poor knowledge of percents. What would you say to a student who has this misconception.

Curriculum Tags: Gr7, Gr8, MTH1W

https://bsky.app/profile/bobsonwong.com/post/3madl47uyz22l

Bad math #MTBoS #ITeachMath

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— Bobson Wong (@bobsonwong.com) December 19, 2025 at 6:20 AM

Image Links

Cosine on a Bovine
Curriculum Tags: MPM2D, MCR3U, MCF3M, MHF4U
https://x.com/howie_hua/status/2001449294176592049

You've heard of elf on the shelf but have you heard of pic.twitter.com/Iy4IG03Zs2

— Howie Hua (@howie_hua) December 18, 2025

I have a z-mas tree at my house :-)
Curriculum Tags: MCR3U
https://x.com/Anthony_Bonato/status/2001279107871457399

As a mathematician, I must post this every Christmas season. I don't make the rules pic.twitter.com/jmaKTUzXcu

— Anthony Bonato (@Anthony_Bonato) December 17, 2025

Sometimes the nature of math is amazing
Curriculum Tags: All
https://x.com/pickover/status/1999494678501294412

Mathematics and mystery.

Shiver in ecstasy. The circle that fits precisely inside a 3-4-5 Pythagorean triangle has an area of π. OMG. pic.twitter.com/QtpYmwiiAE

— Cliff Pickover (@pickover) December 12, 2025

Classic factorial humour
Curriculum Tags: MDM4U
https://x.com/pickover/status/2000676079514567060

This is a math joke.
(Meme circulating widely on the Web.) pic.twitter.com/pSewCXvwnv

— Cliff Pickover (@pickover) December 15, 2025

Math Links for Week Ending Dec 12th, 2025

Featured Links

Would you rather is a great strategy, and @JStevens009 has a whole website with prompts
Curriculum Tags:All
https://www.wouldyourathermath.com/
https://x.com/howie_hua/status/1999210926982214071

I turned my most boring math lesson into one of my most engaging math lessons by doing this one thing pic.twitter.com/ykcQ8le3Q3

— Howie Hua (@howie_hua) December 11, 2025

Resource Links

Another classic set of Calendar Problems
Curriculum Tags: All
https://karendcampe.wordpress.com/2025/12/01/december-calendar-problems-4/

Here's the December Calendar of Problems from 40 years ago... the first year of the calendar format!! Enjoy #ProblemSolving this month yourself or w/students; share thinking here or on the post. #MTBoS #iTeachMath #T3Learns #MathsToday #RecreationalMath karendcampe.wordpress.com/2025/12/01/d...

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— Karen Campe (@karencampe.bsky.social) December 1, 2025 at 9:03 AM

Video Links

I like this proof of the Birthday Problem. It would be good to use when teaching about logarithms
Curiculum Tags: MHF4U
https://www.youtube.com/watch?v=OUQVhnuTMVU

A great way to show that how you arrange things can be helpful
Curriculum Tags: MTH1W
https://x.com/howie_hua/status/1997336910558105979

Did you know all prime numbers (except 2 and 3) are one away from a multiple of 6? Here's how we can show this. pic.twitter.com/kj5vwXFkyw

— Howie Hua (@howie_hua) December 6, 2025

I've seen these before but I never get tired of seeing them
Curriculum Tags: Gr8, MTH1W
https://x.com/howie_hua/status/1998462189154562173

Why does the Pythagorean theorem work?

Here are three proofs, including a proof submitted by a U.S. president 5 years before his presidency. pic.twitter.com/82UAkx2SL4

— Howie Hua (@howie_hua) December 9, 2025

Image Links

How long will this pattern go?
Curriculum Tags: All
https://x.com/Ganeshuor/status/1999124320967352809

41 is prime
41+2 is prime
41+2+4 is prime
41+2+4+6 is prime
41+2+4+6+8 is prime
41+2+4+6+8+10 is prime
41+2+4+6+8+10+12 is prime
41+2+4+6+8+10+12+14 is prime
41+2+4+6+8+10+12+14+16 is prime
41+2+4+6+8+10+12+14+16+18 is prime
41+2+4+6+8+10+12+14+16+18+20 is prime

— Ganesh Kumar (@Ganeshuor) December 11, 2025

Math Links for Week Ending Dec 5th, 2025

Featured Links

The Winter Marbleslides is here
Curriculum Tags:All
https://classroom.amplify.com/activity/686fd347372496a99af83645?collections=651ca31cf69ee59aa9e3818a%2C632c77b104648305feffcfda

⛄ Marbleslides: Winter Edition is here!

In this activity, students write equations to capture stars, then the final level switches to transforming points to guide marbles through a snowflake.

❄️ Try it out: https://t.co/t1g5PQlmPA. pic.twitter.com/DQYAfmEre6

— Amplify (@Amplify) December 5, 2025

ResourceLinks

A visual representation of the sum of the first few perfect squares (wth manipulatives)
Curriculum Tags: MCR3U
https://themathguy.blogspot.com/2025/11/the-sum-of-first-n-square-numbers.html

I came across a really nice way of visually showing the sum of the first n square numbers. Details in this blog: themathguy.blogspot.com/2025/11/the-...

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— Mike Jacobs (@mikejacobs.bsky.social) November 10, 2025 at 10:57 AM

Video/Audio Links

My latest podcast, this time with @TheMathGuru as she previews our December Webinar
Curriculum Tags: All
https://talks.oame.on.ca/season-8

[New Podcast] This episode features @TheMathGuru
previewing their Dec 10th @OAMEcounts members only webinar "Math Therapy: How to help students overcome their fear of math!". More info: https://t.co/FNER2hKNvd #MathChat #MTBoS #iTeachMath pic.twitter.com/6MPnoj9myA

— OAMEtalks (@OAMEtalks) December 2, 2025

A quick explainer
Curriculum Tags: MHF4U
https://x.com/howie_hua/status/1996954972710433177

Why does e^ln(x)=x? pic.twitter.com/iXDu3M71r8

— Howie Hua (@howie_hua) December 5, 2025

Image Links

A nice visual summary
Curriculum Tags: MTH1W
https://x.com/Ganeshuor/status/1996786329355800940

Important things about circle pic.twitter.com/kxgjwCCzqs

— Ganesh Kumar (@Ganeshuor) December 5, 2025

Math Links for Week Ending Nov. 28th, 2025

Featured Links

I have always been a fan of CODAP (even when it was Fathom). Now you can try the new version
Curriculum Tags: MDM4U
https://codap.concord.org/v3-beta/

Help us shape the future of CODAP by beta testing CODAP V3! With lighter colors, sharper icons, smoother navigation, and the ability to handle much larger datasets, V3 is being designed to bring CODAP into the future. Share your feedback! https://t.co/uXj2ar7I2r pic.twitter.com/b7sVF3BTIJ

— CODAP (@CODAPdatasci) November 20, 2025

Resource Links

Need a source of natural tessellations? I've always been a fan of tessellations. So of course, I love them in nature
Curriculum Tags: All
https://tessellated-materials.mpikg.mpg.de/collection

A huge, beautiful library of tessellated materials in biology! pic.twitter.com/mKud6FcLnh

— Greg Egan (@gregeganSF) November 21, 2025

Video Links

Randomness becomes the normal distribution
Curriculum Tags: MDM4U
https://x.com/PhysInHistory/status/1991070980756668692

The Galton Board demonstrates the Central Limit Theorem by showing how steel balls, as they pass through levels of branching paths, consistently form a bell curve distribution. This illustrates how random processes tend to cluster around the average. pic.twitter.com/ECWHVhLQSX

— Physics In History (@PhysInHistory) November 19, 2025

Image Links

Beautiful math is everywhere
Curriculum Tags: All
https://x.com/pickover/status/1991668238242152561

Mathematics and symmetry.

Geometry, math, pattern, transcendence. Pattern on the ceiling at the Taj Mahal, India. https://t.co/JmR3nGbl4R pic.twitter.com/2LCRD8KD0K

— Cliff Pickover (@pickover) November 21, 2025

This is a crazy Klein bottle
Curriculum Tags: All
https://x.com/pickover/status/1991614117661323328

Mathematics. Enter a higher dimension.

Spiral Klein Bottle. Source: https://t.co/Vbn0Asj9X2 pic.twitter.com/lGLJmkWsIo

— Cliff Pickover (@pickover) November 20, 2025

You can never have too many WODBs
Curriculum Tags: All
https://x.com/pwharris/status/1991537106892792319

#TryThisThursday

My favorite way to play Which One Doesn't Belong is to choose a reason for each one to not belong.
What are you thinking?#MathIsFigureOutAble #MTBoS #ITeachMath #MathEd pic.twitter.com/8E6q9zkcJp

— Pam Harris (@pwharris) November 20, 2025

Math Links for Week Ending Nov. 21st, 2025

Featured Links

Very cool new Polypad feature making it possible to assign a new Amplify Classroom (Formally Desmos Classroom) activity.
Curriculum Tags: All
https://service.amplify.com/article/amplify-classroom-using-polypad-in-activity-builder

Exciting Polypad update! Educators can now create and assign an @amplifyeducation.bsky.social activity directly from a saved Polypad. Learn more at polypad.amplify.com/p#help-whats-new

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— David Poras (@davidporas.bsky.social) November 13, 2025 at 11:57 AM

Resource Links

What a great idea to infuse literacy in your math class
Curriculum Tags: MDM4U
https://bsky.app/profile/jedediyah.com/post/3m663bgtx7c2t

Shared a Thanksgiving gift with my data science students today! I spend a couple months collecting used copies. Next month we will read chapter 3 Arms Race and reflect on feedback systems and the susceptibility and sensitivity of data models to manipulation.

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— Jed (@jedediyah.com) November 21, 2025 at 3:03 PM

Video Links

Are you looking for something to do to have your kids practice with calculations including powers? How about this?
Curriculum Tags: MTH1W
https://x.com/howie_hua/status/1990126409168142536

What digit is in the ones place when we evaluate 67⁴¹? pic.twitter.com/CQs5VivHNT

— Howie Hua (@howie_hua) November 16, 2025

Image Links

The most common 4 digit PIN numbers, visualized
Curriculum Tags: MDM4U
https://informationisbeautiful.net/visualizations/most-common-pin-codes/

WARNING! This image may trigger PINSecurity. From an analysis of 3.4m PIN codes leaked from several data breaches informationisbeautiful.net/visualizatio...

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— Information is Beautiful (@infobeautiful.bsky.social) November 21, 2025 at 10:55 AM

Math Links for Week Ending Nov 14th, 2025

Featured Links

Years ago I wrote about using Plickers (here) and so it was neat to see it come up. It's an almost no-tech way to do instant surveys in class.
Curriculum Tags: All
https://wecdsbit.blogspot.com/2014/11/plickers-free-clicker-app-with-almost.html

I wrote a blog post about Plickers over 10 years ago. Thanks for the reminder: wecdsbit.blogspot.com/2014/11/plic...

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— DavidPetro314 (@davidpetro314.bsky.social) November 8, 2025 at 8:52 AM

Resource Links

I love a good and practical combinatorics problem
Curriculum Tags: MDM4U
https://robertkaplinsky.com/work/how-many-soda-combinations-are-there-on-a-coke-freestyle/

Coke Freestyle machines allow you to take soft drinks and add up to 14 flavors to them. What strategies might your students use to determine how many soda combinations there are on a Coca-Cola Freestyle? robertkaplinsky.com/work/ho...

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— Robert Kaplinsky (@robertkaplinsky.com) November 5, 2025 at 6:14 PM

Video Links

The normal distribution as performance art
Curriculum Tags: MDM4U
https://x.com/Rainmaker1973/status/1988846789542441288

You can literally see the normal distribution pic.twitter.com/WdHpAD3TCE

— Massimo (@Rainmaker1973) November 13, 2025

A good starter for your class when talking about numbers or patterns
Curriculum Tags; Gr7, Gr8, MTH1W
https://x.com/howie_hua/status/1988740091372871929

Can you find 1,000 in this grid?

This is one of my favorite mathematical tasks that I give to students. pic.twitter.com/roNjuEnEE9

— Howie Hua (@howie_hua) November 12, 2025

I have always liked this falacy
Curriculum Tags: All
https://x.com/howie_hua/status/1987539561405428139

Why can't we just say 0/0=1?

I showed one way why this would break math. What's another way? pic.twitter.com/ctsm28fBjm

— Howie Hua (@howie_hua) November 9, 2025

Image Links

Who doesn't love a taxicab number?
Curriculum Tags:All
https://x.com/PhysInHistory/status/1988616819977154726

You are a math geek if you know what this number is ✍️ pic.twitter.com/LXcEMPFCql

— Physics In History (@PhysInHistory) November 12, 2025

Math Links for Week Ending Nov 7th, 2025

Featured Links

I have definitely experienced frustration from students when I don't answer their questions directly "Sir, when are you actually going to teach us?".
Curriculum Tags: All
https://robertkaplinsky.com/one-way-get-students-persevere/

Do your students ever get frustrated when you don't help them as much as they'd like? Here's what I tell them to appreciate what I'm doing for them.https://t.co/mewWggLbTM pic.twitter.com/dVywtjKL8T

— Robert Kaplinsky (@robertkaplinsky) November 3, 2025

Resource Links

Some classic NCTM calendar problems
Curriculum Tags: All
https://karendcampe.wordpress.com/2025/11/01/november-calendar-problems-3/

November is here, and so is the next Calendar of problems! Enjoy these with your students or for yourself, share your thinking here or on the post. #MTBoS #iTeachMath #T3Learns #MathSky #RecreationalMath #MathsToday karendcampe.wordpress.com/2025/11/01/n...

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— Karen Campe (@karencampe.bsky.social) November 1, 2025 at 8:19 AM

Video/Audio Links

The latest OAMEtalks podcast
Curriculum Tags: All
https://talks.oame.on.ca/season-8

[New Podcast] This episode features Stacey Jacobs previewing their Nov 12th @oamecounts.bsky.social members only webinar "Empowering Math Learners: Executive Function Strategies to Support Math Learning". More info: talks.oame.on.ca/season-8 #MathChat #MTBoS #iTeachMath

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— DavidPetro314 (@davidpetro314.bsky.social) November 3, 2025 at 11:01 PM

Math class is not a race
Curriculum Tags: Gr7, Gr8, MTH1W

https://x.com/howie_hua/status/1984623920608395686

Hot take but I always see videos of the butterfly method go viral but I would *never* teach this method and here's why. pic.twitter.com/hJplB1Tzu4

— Howie Hua (@howie_hua) November 1, 2025

Image Links

There is data about everything :-)
Curriculum Tags: MDM4U
https://bsky.app/profile/infobeautiful.bsky.social/post/3m4yr7lqxot2p

Dude, bro, buddy, fella by Quartz @qz qz.com/316906/the-d...

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— Information is Beautiful (@infobeautiful.bsky.social) November 6, 2025 at 6:55 PM

Math Links for Week Ending Oct 31st, 2025

Featured Links

I always appreciate @BenOrlin's dry humour and mathematical prowess. In this case he suggests the 10 best triangles of the 2st century 
Curriculum tags: All
https://mathwithbaddrawings.com/2025/10/14/10-best-triangles-of-the-21st-century-so-far/

Resource Links

Just a bit of math and poetry with this blog
Curriculum Tags: All
https://poetrywithmathematics.blogspot.com/2025/10/can-math-be-funny.html

Video Links

This could be a great application of integers
Curriculum Tags: Gr7, Gr8, MTH1W
https://x.com/howie_hua/status/1983300047069688334

Did you know you can subtract left to right? 😱 pic.twitter.com/DkOE27dnHM

— Howie Hua (@howie_hua) October 28, 2025

Image Links

Classic math joke for Halloween
Curriculum Tags: All
https://x.com/howie_hua/status/1982895725953593773

Wear this on Halloween to scare your math teachers pic.twitter.com/J5Oud4QgPx

— Howie Hua (@howie_hua) October 27, 2025

Math Links for Week Ending Oct 24th, 2025

Featured Links

Student voice is so important in math class
Curriculum Tags: All
https://www.youtube.com/watch?v=YPvpfOl-lIw

NCTM 2025 in Atlanta was inspiring! Please watch the IGNITE talk by my mentor, Dr. Dawn Pilotti on how to fix Mathematics education for students with learning differences. youtu.be/YPvpfOl-lIw #iTeachMath ♾️ #MTBoS #EduSky #MathSky

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— emmalalas.bsky.social (@emmalalas.bsky.social) October 19, 2025 at 9:39 PM

Resource Links

I never miss a chance to share this article "Never Say Anything a Kid Can Say"
Curriculum Tags: All
https://hybridalgebra.pbworks.com/f/Never+Say+Anything+a+Kid+Can+Say.pdf

I love this timeless article from Steven C. Reinhart about teacher moves in the math classroom that help get kids doing more of the communicating (instead of the teacher). One of my absolute favorites: https://t.co/iqnKI70LSg pic.twitter.com/mie8FyPR7T

— Robert Kaplinsky (@robertkaplinsky) October 18, 2025

Video Links

Fooling around with factorials? Try this
Curriculum Tags: MDM4U
https://x.com/howie_hua/status/1979920355134189757

Which is larger: 100!×100! or 99!×101! ? pic.twitter.com/TaEzaZusiz

— Howie Hua (@howie_hua) October 19, 2025

Image Links

I would give this as a bonus question where they would have to explain both the calculus portion and the relationship portion :-)
Curriculum Tags: MCV4U
https://x.com/mathladyhazel/status/1981173929764147381

This calculus joke 😂 pic.twitter.com/mQ6wO0QeQz

— Math Lady Hazel 🇦🇷 (@mathladyhazel) October 23, 2025

A mash up of thinking classrooms and math therapy
Curriculum Tags: All
https://x.com/TheMathGuru/status/1978139136121860298

From my presentation w @pgliljedahl at @MathEdLeaders - we are all better together 🧡🩷 https://t.co/BeMHpYcfZE

— vanessa vakharia (@TheMathGuru) October 14, 2025

Math Links for Week Ending Oct 17th, 2025

Featured Links

I'm always happy to find something I've done that matches so well with something Howie has talked about
Curriculum Tags: Gr7, Gr8, MTH1W
https://engaging-math.blogspot.com/2017/01/equation-strips.html

This is great from @howiehua.bsky.social I have always called these "equation strips" but definitely love them for solving 1 and 2 step equations. Here are some resources I've put together engaging-math.blogspot.com/2017/01/equa... #MathChat #MTBoS #iTeachMath

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— DavidPetro314 (@davidpetro314.bsky.social) October 12, 2025 at 12:43 PM

Resource Links

Who doesn't want non routine problems? Here are 20 non routine quadratic problems from @benjamindickman.bsky.social

Curriculum Tags: MPM2D, MCR3U
https://www.desmos.com/calculator/dym2zkrvcm




If you focus on vocabulary and equity in your math class, you might want to look at some of the tips in this post:
Curriculum Tags: All
https://mathsational.blogspot.com/2025/10/bridging-gap-building-math-confidence.html

📢 New on the blog: “Bridging the Gap: Building Math Confidence Through Equity and Vocabulary” 💬✨ Empower student agency, promote rich vocab, and boost confidence. Read it now: mathsational.blogspot.com/2025/10/bridging-gap-building-math-confidence.html #MTBoS #iTeachMath

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— Jennifer Abel (@abeljennifer.bsky.social) October 12, 2025 at 11:46 AM

Looking for some good math discussion? Why not try #ElmeMathChat?
Curriculum Tags: All
https://bsky.app/hashtag/ElemMathChat

Don’t miss #ElemMathChat Join us Oct 23 when Sue Looney @looneymath.bsky.social will lead us in ‘Explore “Geometric learning in the early grades.” #ElemMathChat ⏰ 9–10pm ET | 8–9pm CT #MathEd #ITeachMath #MTBoS

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— Melynee Naegele (@mnmmath.bsky.social) October 17, 2025 at 4:24 PM

Video Links

This is a good non standard problem dealing with area of a circle
Curriculum Tags: Gr8, MTH1W
https://bsky.app/profile/howiehua.bsky.social/post/3m2weyj32jc2i

Is the 6" or 7" slice of pizza the better deal?

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— Howie Hua (@howiehua.bsky.social) October 11, 2025 at 10:20 AM

I like the way that Howie describes the solution (including the caveats)
Curriculum Tags: MDM4U
https://x.com/howie_hua/status/1978579828770033685

What is the probability of getting a "Select all that apply" question correct just by guessing? pic.twitter.com/oYVRL32wMt

— Howie Hua (@howie_hua) October 15, 2025

I like when Howie makes videos talking about simple mathematical ideas
Curriculum Tags: MPM2D, MCR3U, MCF3M, MBF3C
https://x.com/howie_hua/status/1979320729196990802

Introduction to using zero product property to factor quadratic equations pic.twitter.com/DFwOlyGFdP

— Howie Hua (@howie_hua) October 17, 2025

I love revealing this concept to students (and teachers)

Curriculum Tags: MPM2D, MCR3U, MCF3M, MBF3C
https://x.com/howie_hua/status/1978959341156803015

Did you know completing the square literally means to complete the square? I didn't when I was in high school and that would've made it so much easier. pic.twitter.com/6ZJiH1eErK

— Howie Hua (@howie_hua) October 16, 2025

Image Links

A nice visualization of functions
Curriculum Tags: All
https://x.com/Ganeshuor/status/1979133946127618308

Mathematics may appear harsh in the beginning, but as you discover its inner beauty, it becomes a source of endless joy. pic.twitter.com/wK3lYKJEzw

— Ganesh Kumar (@Ganeshuor) October 17, 2025

Math Links for Week Ending Oct 10th, 2025

Featured Links

I know that there have been many secondary teachers waiting for this set of problems. Here's a sample
Curriculum Tags: All
https://x.com/pgliljedahl/status/1976088834212515884

Here's a sneak peek to Task 30: Graphing Linear Equations! https://t.co/gJhlhhJwnb

— Peter Liljedahl (@pgliljedahl) October 9, 2025

Resource Links

The Visual Patterns website has been around for a while but 500 patterns is still impressive
Curriculum Tags: All
https://x.com/fawnpnguyen/status/1975287062980141411

We now officially have 500 visual patterns! 🎉

Christophe from France just shared SIX wonderful building-brick patterns he discovered while playing with his daughter. 💕

Check out visual patterns #495-500: https://t.co/hobByX78Su pic.twitter.com/drwRrFh7Ki

— Fawn Nguyen (@fawnpnguyen) October 6, 2025

Video Links

If your students are learning about squares of numbers, this might be the kernel for an interesting activity about creating any odd number with the difference of squares
Curriculum Tags: Gr8, MTH1W
https://x.com/howie_hua/status/1975570637109518668

Fun mental math trick: All odd numbers can be written as the difference of two consecutive square numbers. Here's how we can do this mentally. pic.twitter.com/MDeJ5vnbxj

— Howie Hua (@howie_hua) October 7, 2025

Is he right? Have your students test it out
Curriculum Tags: MDM4U
https://x.com/howie_hua/status/1976032229643141302

Don't roast me if I am wrong but I THINK I found a new way of finding the harmonic mean???

I couldn't find any source explaining it like this, but even if it isn't new, I think it's a good way of explaining what the harmonic mean wants. pic.twitter.com/K2kMWGbirg

— Howie Hua (@howie_hua) October 8, 2025

Image Links

Math is everywhere
Curriculum Tags: MCV4U
https://x.com/pickover/status/1973775091617153511

Mathematics. Tattoos. (Image circulating widely on the Web.) pic.twitter.com/qmDHStoy6I

— Cliff Pickover (@pickover) October 2, 2025

I have always liked this fallacy based on dividing by zero
Curriculum Tags: All
https://x.com/pickover/status/1976105777799770232

Mathematics.

At bottom, we conclude that "2 = 1". pic.twitter.com/aEEkKWL8Hw

— Cliff Pickover (@pickover) October 9, 2025

Math Links for Week Ending Oct 3, 2025

Featured Links

As someone who has ADHD, it was interesting to interview a kindred spirit about his own journey and how he uses it in class
Curriculum Tags: All
https://talks.oame.on.ca/season-8

[New Podcast] This episode features Chad Harris previewing their Oct 8th @OAMEcounts members only webinar "Wait, what was I learning? Shedding light on Neurodivergent Experiences in the Classroom". More info: https://t.co/FNER2hKfFF #MathChat #MTBoS #iTeachMath pic.twitter.com/quwV0B6lQA

— OAMEtalks (@OAMEtalks) October 3, 2025

Resource Links

Some historical geometry for you
Curriculum Tags: All
https://www.quantamagazine.org/new-math-revives-geometrys-oldest-problems-20250926/

www.quantamagazine.org/new-math-rev... New Math Revives Geometry’s Oldest Problems. Using a relatively young theory, a team of mathematicians has started to answer questions whose roots lie at the very beginning of mathematics. #math #maths #geometry #enumerativegeometry #mathsky #iteachmath #MTBoS

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— Dawn Del Vecchio (@dawndelvecchio.bsky.social) September 28, 2025 at 11:54 AM

Some more classic calendar problems
Curriculum Tags: All
https://karendcampe.wordpress.com/2025/10/01/october-calendar-problems-3/

October is here & so is the next month's #ProblemSolving calendar! Share your thinking (& your students' thinking) here or on the post. #MTBoS #iTeachMath #T3Learns #RecreationalMath #MathsToday karendcampe.wordpress.com/2025/10/01/o...

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— Karen Campe (@karencampe.bsky.social) October 1, 2025 at 8:12 AM

Video Links

Some algebra, some factoring, nice
Curriculum Tags:MTH1W
https://x.com/howie_hua/status/1973882582996824123

If chicken nuggets only came in boxes of 6 and 7, what's the largest order not possible? pic.twitter.com/TDVVNgZD29

— Howie Hua (@howie_hua) October 2, 2025

Image Links

This is just your average math joke
Curriculum Tags: MDM4U
https://x.com/howie_hua/status/1974217785669472351

Mean Girls but it's a movie about Cady learning the different types of mean. pic.twitter.com/Z7CEaIZ8Sm

— Howie Hua (@howie_hua) October 3, 2025

Math Links for Week Ending Sept 26, 2025

Featured Links

Who doesn't like a bit of math and art. Here are a bunch of sites where you can purchase some mathematical art. From T-shirts to posters to sculptures. 
Curriculum Tags: All
https://www.diffgeom.org/misc/math_shops.html

Although my online shop Differential Geometry is a primary source of income, I maintain (on a static html site) a list of other creators' mathematical online shops: www.diffgeom.org/misc/math_sh... I hope you will browse and support us all! #MathSky #MathArt #ITeachmath #SmallBusiness

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— Original Math Designs (@diffgeom.com) September 21, 2025 at 10:38 AM

Resource Links

It's funny because it's true
Curriculum Tags: All
https://theonion.com/majority-of-americans-never-use-physical-education-afte-1819570362/

I love The Onion's parody of the often heard "When will I ever use this?" comment but applied to physical education: https://t.co/nh4AsQuYrJ pic.twitter.com/mOuCp1oUMR

— Robert Kaplinsky (@robertkaplinsky) September 20, 2025

I never miss a chance to promote Slow Reveal Graphs
Curriculum Tags: All
https://www.edutopia.org/article/using-graphs-promote-data-literacy-elementary-school

By revealing graphs piece by piece, teachers can build student curiosity and guide them to more effectively make sense of data! 📊 #DataLiteracy #EduSky #MathSky

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— Edutopia (@edutopia.org) September 20, 2025 at 10:34 PM

Video Links

I like being able to visualize something that you never thought you could
Curriculum Tags: MTH1W, MPM2D
https://x.com/howie_hua/status/1969764417563967740

Did you know that we can visually see why sqrt(40)=2sqrt(10)? Let's see how we can visualize rewriting square roots! pic.twitter.com/WHHcV4obkL

— Howie Hua (@howie_hua) September 21, 2025

Image Links

Calculus humour
Curriculum Tags: MCV4U
https://x.com/pickover/status/1969477890753331220

Suzy, studying math, warps reality. Math joke for cats. pic.twitter.com/v9UQhWPv9Q

— Cliff Pickover (@pickover) September 20, 2025

Math Links for Week Ending Sept 19th, 2025

Featured Links

I always like to highlight other compilations of resources 
Curriculum Tags: All
https://www.resourceaholic.com/2025/09/5-maths-gems-192.html

New! My 192nd gems post. Ideas, updates and resources for maths teachers. 💎https://t.co/tY0izsANzd

Hat tips will follow on Bluesky.#mathsgems #mathschat #teammaths #mathscpdchat #mathstlp pic.twitter.com/PraThyu47s

— Jo Morgan (@mathsjem) September 13, 2025

Resource Links

I'm all for tricking students into learning :-)
Curriculum Tags: All
https://www.edutopia.org/article/14-exceptionally-fun-math-games-for-middle-and-high-school

Your middle and high school students might actually forget they’re learning. These rigorous math games get students thinking deeply about mathematical concepts—and loving every minute of it! 🎉 #MathSky #ITeachMath #EduSky

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— Edutopia (@edutopia.org) September 18, 2025 at 6:14 AM

Video Links

Anytime you can visualize something that is abstract then it's a good thing.
Curriculum Tags: MHF4U
https://x.com/howie_hua/status/1969156757969646077

Drawing can help make polynomial division easier! pic.twitter.com/daopCIM8wb

— Howie Hua (@howie_hua) September 19, 2025

This would be a good prompt for a discussion on number sense
Curriculum Tags: MTH1W
https://x.com/howie_hua/status/1968814676700959175

Applying the divisibility rule of 9 feels like a superpower pic.twitter.com/dA8nNlqMLy

— Howie Hua (@howie_hua) September 18, 2025

Image Links

I love the imbedded rectangles
Curriculum Tags: All
https://bsky.app/profile/murrayh83.bsky.social/post/3lz4y5znjnc2q

Pattern block play! #21CenturyPB #iTeachMath

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— Hana Murray (@murrayh83.bsky.social) September 18, 2025 at 2:29 PM

Math Links for Week Ending Sept 12, 2025

Featured Links

This is a super fun prompt. My first saved graph was from May 2, 2012
Curriculum Tags: All

https://bsky.app/profile/mrcorleymath.bsky.social/post/3lyks7kcmek2a

This could be fun! Inspired by Jed's post, find your OLDEST saved graph in @desmos.com and share it! #mtbos #iteachmath

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— Nick Corley (@mrcorleymath.bsky.social) September 11, 2025 at 8:54 AM

Resource Links

I never say no to new stats resources
Curriculum Tags: MDM4U
https://mathsweek.scot/schools/learning-resources/stats-in-the-wild

We would love to hear your thoughts on our new set of maths teaching resources, developed in partnership with @mathsweek.scot Please share widely! #ITeachMaths #ITeachMath #MTBoS @scotstemambassador.bsky.social @royalstatsoc.bsky.social

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— Darren Macey (@darrenmacey.bsky.social) September 11, 2025 at 2:37 PM

I like to use the word "tinker" but @NatBanting talks about the nature of playing with a problem
Curriculum Tags: All

https://natbanting.com/play-with-your-problems/

I wrote a new post yesterday: natbanting.com/play-with-yo... It’s about the benefits of teachers tinkering with the problems/prompts we offer students. (And, tangentially, about the benefits of conference spaces where we are given license to do so) #iteachmath

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— Nat Banting (@natbanting.bsky.social) September 11, 2025 at 8:22 AM

Video Links

A nice strategy for comparing fractions
Curriculum Tags: Gr7, Gr8, MTH1W
https://x.com/howie_hua/status/1965934153943363706

Fraction comparison strategy: Same parts away from the whole pic.twitter.com/747SUsx9Tw

— Howie Hua (@howie_hua) September 11, 2025

Image Links

Fun with tiling
Curriculum Tags: All
https://bsky.app/profile/maria-naturalmath.bsky.social/post/3lxkzkilwmk2y

Organic-looking curves made out of simple polygons? My jam! #iTeachMath #MathSky

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— Maria D. at Natural Math (@maria-naturalmath.bsky.social) August 29, 2025 at 5:41 PM

Math Links for Week Ending Sept. 5th, 2025

Featured Links

We are starting our 8th season of OAMEtalks. Webinars for our OAME members but the first one is always free. That's Jamie Mitchell talking about Hacking Assessment with AI. Register now for the webinar on Sept 10th and listen to the podcast preview now. 
Curriculum Tags: All
https://talks.oame.on.ca/season-8

Season 8 of @OAMEcounts OAMEtalks is live at https://t.co/0Tk5NbHctV

This season has speakers from #OAME2025https://t.co/FNER2hKfFF featuring@realJ_Mitchell Chad Harris @TheMathGuru @mrsstaceyj @CharalSonya @rosemortillaro @MsNicolePeckham #MathChat #MTBoS #iTeachMath pic.twitter.com/atSH5vD3u8

— OAMEtalks (@OAMEtalks) September 1, 2025

[New Podcast] This episode features @realJ_Mitchell
previewing their Sept 10th @OAMEcounts free webinar "Hacking Assessment in the AI Age". More info:https://t.co/FNER2hKfFF #mathchat #MTBoS #iTeachMath pic.twitter.com/bXXRMjSysU

— OAMEtalks (@OAMEtalks) September 3, 2025

Resource Links

@MathyCathy gives us some sobering thoughts and advice about the recent change from Desmos to Amplify 
Curriculum Tags: All
https://www.mathycathy.com/blog/2025/08/amplify-classroom-%E2%89%A0-desmos-classroom/

Are you a teacher planning to use @Amplify Classroom with students during SY 25-26?
Here's some advice to consider! #iteachmath
Amplify Classroom ≠ Desmos Classroom https://t.co/ApMoYxHcNv

— Cathy Yenca (@mathycathy) August 16, 2025

Video Links

This makes the dividing algorithm make sense 
Curriculum Tags: All
https://x.com/howie_hua/status/1963011782483787947

How do we do this "new" way of dividing? pic.twitter.com/wGsv6Fg0O1

— Howie Hua (@howie_hua) September 2, 2025

I never shy away a visual for multiplication
Curriculum Tags: Gr7
https://x.com/howie_hua/status/1962184847277068773

If you want to be better with multiplication, think about rectangles. Here's what I mean: pic.twitter.com/ubpmQt6Hql

— Howie Hua (@howie_hua) August 31, 2025

Image Links

A nice simple relationship that seems too good to be true
Curriculum Tags: Gr7, Gr8
https://x.com/abakcus/status/1963704620162920862

Three squares on the left, two on the right.
Perfect balance. ⚖️

10² + 11² + 12² = 13² + 14² pic.twitter.com/fHktRDbdPF

— Abakcus (@abakcus) September 4, 2025