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

[image or embed]

— 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

[image or embed]

— 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-...

[image or embed]

— 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