Math Links for Week Ending Jan. 23rd, 2026

Featured Links

This site has been around for more than a decade so it was great to get a reminder of it. What a great connection of art, data and infographics.
Curriculum Tags: MDM4U
https://www.dear-data.com/theproject

via my favorite librarian www.dear-data.com/theproject pretty amazing #mathart #dataviz project

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— John Golden (@johngolden.bsky.social) January 19, 2026 at 2:07 PM

Resource Links

I have always been a fan of Slow Reveal Graphs and you should be too. Here is a collection from @benjamindickman.bsky.social that deals with many of the current events that are in the news right now. 
Curriculum Tags: MDM4U
https://www.collectedny.org/2026/01/slow-reveal-graphs-current-events/

Video Links

It's always good to have a mechanical way to prove geometric theorems
Curriculum Tags: MAT1W
https://x.com/TimBrzezinski/status/2014109261035442607

No tech. Just paper. Pure simplicity. Here, an effective means for students to explore any polygon’s exterior angles. #mathematics #geometry pic.twitter.com/kzue5KuGET

— Tim Brzezinski (@TimBrzezinski) January 21, 2026

This makes total sense but I have never taught it this way
Curriculum Tags: MCR3U
https://x.com/howie_hua/status/2013705992761156018

Let's learn how to evaluate fractional exponents pic.twitter.com/0yjyX9U5DS

— Howie Hua (@howie_hua) January 20, 2026

Image Links

Let the math memes continue
Curriculum Tags: MCR3U
https://bsky.app/profile/curiouspolymath.bsky.social/post/3mcwwbwl5ks2u

#mathsky

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— Pete Wung The Curious Polymath (@curiouspolymath.bsky.social) January 21, 2026 at 9:51 AM

Math Links for Week Ending Jan 16th, 2026

Featured Links

I don't think you can never have enough resources with "mind benders". So here's a new one that's got @3Blue1Brown at the helm
Curriculum Tags: All
https://momath.org/mindbenders/

Monthly Mind-benders puzzles from Peter Winkler and @3blue1brown.com! A great team together with @momath.bsky.social. The first puzzle is out now. #ITeachMath momath.org/mindbenders/

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— Erick Lee (@theericklee.bsky.social) January 16, 2026 at 2:44 PM

Resource Links

I think that looking at "tricks" like this in terms of why they work is always a good thing.
Curriculum Tags: All
https://bsky.app/profile/mathowitz.bsky.social/post/3mckpwpv42s2v

How to divide a number by 5. Double the number. Move the decimal place one unit to the left. You're welcome. 4283/5 8566 856.6 It's *magic* (and i'm sure it has nothing to do with the fact that 5=10/2 😜)

— Carl (@mathowitz.bsky.social) January 16, 2026 at 1:26 PM

Video Links

I think it's always good to know why algorithms work
Curriculum Tags: MPM2D, MCR3U, MCF3M
https://bsky.app/profile/howiehua.bsky.social/post/3mci3tuvhgc2x

Let's learn how to factor quadratics where the leading coefficient isn't 1 without guessing and checking. (Okay I know that sounds boring but I like this video lol)

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— Howie Hua (@howiehua.bsky.social) January 15, 2026 at 12:21 PM

I think a little geometry could help discover why this works. Here it is in Desmos. When you see it, it makes total sense and all that matters is one piece of wood is twice the width of the other.
Curriculum Tags: MTH1W
https://x.com/Rainmaker1973/status/2012204392494121148

90° angle wood cutting trick

[📹 enticestudio]pic.twitter.com/iNS2ESGies

— Massimo (@Rainmaker1973) January 16, 2026

Image Links

What a great question to ask students
Curriculum Tags: All
https://bsky.app/profile/afetter29.bsky.social/post/3mcizop4nki2z

Here’s an addition to #NoticeWonder. #ElemMathChat

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— afetter29.bsky.social (@afetter29.bsky.social) January 15, 2026 at 9:15 PM

Math Links for Week Ending Jan 9th, 2025

Featured Links

I have been a Desmos Fellow (now Amplify Fellow) since 2018 and it has given me resources, insight and inspiration. And don't think you have to be a Desmos expert to apply. They are just looking for people with innovative ideas. 
Curriculum Tags: All
https://amplify.com/amplify-classroom-fellows/

Resource Links

I have done this with students but not as a "trick" I like this idea. 
Curriculum Tags: MCR3U, MCF3M
https://bsky.app/profile/ahestenes.bsky.social/post/3mbuo7alwm22y

In #MathsToday I had all the students at the whiteboards and asked them to solve ax^2+bx+c=0 by completing the square. They were so surprised to get the quadratic formula as their answer, and then they were proud they had derived this mystical formula without even realizing they were doing it.

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— Adrienne Hestenes (@ahestenes.bsky.social) January 7, 2026 at 6:56 PM

I like that @KarenCampe shows multiple solutions using different tech platforms.
Curriculum Tags: Gr7, Gr8
https://karendcampe.wordpress.com/2026/01/08/go-for-geometry-8/

New blog post: "Go For Geometry! 8 Congruence Motions" using translation and reflection tools in dynamic #geometry technology. #MTBoS #iTeachMath #T3Learns #MathsToday karendcampe.wordpress.com/2026/01/08/g...

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— Karen Campe (@karencampe.bsky.social) January 8, 2026 at 7:29 AM

Video Links

Help with rotations
Curriculum Tags: Gr7, Gr8
https://bsky.app/profile/tbrzezinski.bsky.social/post/3mbz25cini22y

Exploring rotations in the coordinate plane: drive.google.com/file/d/1maRA... & youtube.com/shorts/g31aC... @desmos.com #MTBoS #ITeachMath #edusky #mathteacher

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— Tim Brzezinski (@tbrzezinski.bsky.social) January 9, 2026 at 12:40 PM

Help with Translations
Curriculum Tags: Gr7, Gr8
https://x.com/TimBrzezinski/status/2009678807645728815

Exploring translation by vector: https://t.co/OyTaf1s6lS & https://t.co/qAT1OJ459a @geogebra #MTBoS #ITeachMath pic.twitter.com/FRt4z5bCIP

— Tim Brzezinski (@TimBrzezinski) January 9, 2026

Connecting circle equations to Pythagoras Theorem
Curriculum Tags: MPM2D
https://x.com/TimBrzezinski/status/2008542725482967139

Making sense of circle equations. Student & teacher resources to accompany: https://t.co/ihRtv3m5gd & https://t.co/KbSxYihpJQ & https://t.co/0UztDShJQJ @geogebra pic.twitter.com/CI0Cgt42SX

— Tim Brzezinski (@TimBrzezinski) January 6, 2026

Image Links

Quadratics are everywhere (although, I think this might be a catenary)
Curriculum Tags: MPM2D, MFM2P, MCR3U, MBF3C, MCF3M
https://bsky.app/profile/priy45hah.bsky.social/post/3mbrwmvctfc24

Natures strength or a parabola 🤔 #MathsToday ❄️

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— Priya Shah (@priy45hah.bsky.social) January 6, 2026 at 4:49 PM

Math Links for Week Ending Jan 2nd, 2026

Featured Links

I always appreciate teachers who share what they've found on the web. Here's a bunch of resources and pile of people to follow. I've definitely added a few to my list
Curriculum Tags: All
https://mathhombre.blogspot.com/2025/12/playful-math-carnival-183.html

#playfulmath carnival 183! mathhombre.blogspot.com/2025/12/play... Writing on teaching, fun math, puzzles, games, art...

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— John Golden (@johngolden.bsky.social) December 26, 2025 at 9:22 PM

Resource Links

I'm always grateful for these classic Calendar problems. Happy New Year
Curriculum Tags: All
https://karendcampe.wordpress.com/2026/01/01/january-calendar-problems-4/

Happy new #ProblemSolving year! The January Calendar of #math problems is posted!!
Enjoy them w/your students or yourself--please share your thinking & solutions here or on the post. #iTeachMath #MTBoS #T3Learns #RecreationalMathhttps://t.co/huMUVjxa5G

— Karen Campe (@KarenCampe) January 1, 2026

Video Links

I never say no to a good Fibonacci animation
Curriculum Tags: All
https://x.com/truthache68/status/2006797347557355950

Fibonacci Sequence—each number is the sum of the two preceding ones (e.g., 5 + 8 = 13). Is this proof of intelligent design? pic.twitter.com/4HRdAusDWa

— truthache (@truthache68) January 1, 2026

Image Links

Everyone knows I'm a sucker for a good tesselation
Curriculum Tags: All
https://note.com/tairu_mk/n/n0f67f6db98e1

Miko Imura/Hirono Tyle shared a blogpost on this cool heptagon based #tessellation. note.com/tairu_mk/n/n... (in Japanese, but translates well.)

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— John Golden (@johngolden.bsky.social) January 2, 2026 at 6:32 PM

Made in Excel? What the....
Curriculum Tags: All
https://bsky.app/profile/helsig.bsky.social/post/3mbf7uou43225

Prompt: One color, one shape. Irregular hexagons with rotation and scaling. Made in Excel. #genuary #genuary2026 #genuary1

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— Daniel Wilson (@helsig.bsky.social) January 1, 2026 at 3:30 PM

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