Math Links for Week Ending Jan 31, 2025

Featured Links

A book study for the book "Making Math Stick" is starting this week. 
Curriculum Tags: All
https://oame.on.ca/mcis/index.php

Check it out!

A virtual Making Math Stick Book Study with @oame_qslma.

Spread the word!#math #onted @PembrokePublish pic.twitter.com/PHImicQmxb

— Dr David Costello (@dr_costello) January 27, 2025

Resource Links

Some resources from @MathsJem. Some Geometry and algebra and more. I really like the one with different (related) expressions that asks students to read to each other to guess the expression.
Curriculum Tags: All
https://www.resourceaholic.com/2025/01/5-maths-gems-185.html

New! My 185th gems post. Ideas, resources and updates for maths teachers. 💎 https://t.co/YOtXh1GISK

Hat tips to follow. #mathsgems #mathschat #mathstlp #teammaths #mathscpdchat pic.twitter.com/aEOco7gs91

— Jo Morgan (@mathsjem) January 25, 2025

I use this type of example when talking about expected value with my students. That is, the idea of how the insurance industry uses expected value to figure out how to set premiums. 
Curriculum Tags: MDM4U

https://x.com/AndrewLolmaugh/status/1883899701314924839

Not at all actually. Having run Hole in One contests for the golf course, I can tell you, the dealership will purchase an insurance package that pays them the full retail value of the prize if it happens to be won. Odds of someone winning in the case of a Hole in One is 12,500 to…

— Andrew McLellan Lolmaugh (@AndrewLolmaugh) January 27, 2025

Here's a fun little activity for learning about ratios.
Curriculum Tags: Gr8, MTH1W
https://robertkaplinsky.com/work/how-much-bigger-should-they-make-zoolanders-school/

I love using this lesson to teach about scale and proportions. How many times bigger should Zoolander's school be? https://t.co/0YJjod5rck pic.twitter.com/4wLqbuMWic

— Robert Kaplinsky (@robertkaplinsky) January 27, 2025

I totally appreciate all the work that would have gone into these interactives for practicing dealing with mixed radicals and linear inequalities.
Curriculum Tags: MTH1W, MPM2D

https://bsky.app/profile/imperfectsquare.com/post/3lgsq6gl3bk2k

I love what I call Equation Strips or Bar Models but they are also know as Tape Diagrams. Here are links to my resources and a whole site relating to them
Curriculum Tags: Gr7, Gr8, MTH1W

https://bsky.app/profile/davidpetro314.bsky.social/post/3lgsxw7omhc2o

The Superbowl is coming up and so you might like this activity that uses sports betting probabilities as a real world example. And if you want to take it a step further, this podcast series on sports betting shows why you shouldn't (ie the odds and other things are stacked against you). 
Curriculum Tags: MDM4U
https://teacher.desmos.com/activitybuilder/custom/61f847b4990b4d76d1b6a5e4

Video Links

I have always loved the Sieve of Eratosthenes (even though I can rarely pronounce it)
Curriculum Tags: MTH1W
https://x.com/howie_hua/status/1883285081663701333

How to quickly find all prime numbers from 1 to 100 pic.twitter.com/xROH2NrGSs

— Howie Hua (@howie_hua) January 25, 2025

I used to watch the show Numbers years ago where a mathematician solved crimes. That being said, I didn't know that this new show Prime Target was also about a mathematician, this time trying to save the world with prime numbers (literally). And this substack breaks each episode down. 
Curriculum Tags: All
https://bsky.app/profile/tcorica.bsky.social/post/3lgv2lsxgc22b

Some real world calculus for you
Curriculum Tags: MCV4U
https://bsky.app/profile/mathmatize.bsky.social/post/3lgv6ssix3k2c

Image Links

What math questions would you come up with?
Curriculum Tags: All
https://bsky.app/profile/gregbcurran.bsky.social/post/3lgjfbjdzzs25

Math Links for Week Ending Jan 24th, 2025

Featured Links

A free webinar on computational thinking looks like a great opportunity to learn
Curriculum Tags: All
https://mikeflynn.lpages.co/microburst/

Resource Links

I agree with @DavidKButler, that proofs without words are not without effort
Curriculum Tags: Gr8, MTH1W
https://bsky.app/profile/davidkbutler.bsky.social/post/3lg7j3ihe222d

Video Links

I'm sure you can use this to talk about transformations, recursion and scaling (and maybe other topics) with this video.
Curriculum Tags: All
https://x.com/gregeganSF/status/1880176485677560200

If you let one row of fish follow their nose in Escher’s woodcut “Circle Limit III”, all the rest are forced to swing around wildly.

The fish here are strung out along “hypercycles”: curves in the hyperbolic plane that are equidistant from a given hyperbolic line, but no two … pic.twitter.com/iFvjEd5xoI

— Greg Egan (@gregeganSF) January 17, 2025

I never get tired of this animation to show where the area of a circle formula comes from. You can also use it in Calculus when talking about thinner and thinner slices. 
Curriculum Tags: Gr7, Gr8, MCV4U
https://x.com/mathladyhazel/status/1880470241601622391

It makes soooo much sense now why the area of a circle is πr^2! pic.twitter.com/YEMhXHO3rK

— Math Lady Hazel 🇦🇷 (@mathladyhazel) January 18, 2025

Perfect for the binomial theorem
Curriculum Tags: MDM4U

https://x.com/mathladyhazel/status/1881438549490180292

Order from chaos. The Galton board. pic.twitter.com/5PxBfb2AWf

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

Image Links

I don't know why I love these power and exponent type questions. 
Curriculum Tags: MTH1W, MPM2D, MCR3U
https://x.com/GeometryPuzzles/status/1881033853508452360

90 percent fail this equation #equation pic.twitter.com/coRidz8Lzg

— Math Lover (@GeometryPuzzles) January 19, 2025

Math Links for Week Ending Jan 17th, 2025

Featured Links

Some great free resources from @doingmath
Curriculum Tags: All
https://www.math-that-matters.com/

Resource Links

It's always good to see real world connections to math
Curriculum Tags: All
https://www.popsci.com/science/rockettes-choreography-math/

And here's some great connections to the real world with mathematical modelling 
Curriculum Tags: All
https://www.comap.com/blog/item/math-modeling-examples

Video Links

Some times those who don't think they can do math need extra convincing
Curriculum Tags: All
https://bsky.app/profile/howiehua.bsky.social/post/3lfg342u7js2x

Image Links

I like the colour coding on this Trig primer
Curriculum Tags: MPM2D, MFM2P, MCR3U, MCF3M, MBF3C
https://x.com/mathladyhazel/status/1880103119968956927

Great visual to understand trigonometric functions. pic.twitter.com/sf0N8oME4x

— Math Lady Hazel 🇦🇷 (@mathladyhazel) January 17, 2025

Math Links for Week Ending Jan 10th, 2025

Featured Links

Though I would say that in more recent years I have steered away from always telling, I love how this really outlines different ways to "tell" and reminding you that there really isn't a dichotomy between telling and not telling. I think that this really sums up the gist of the post but read on for more "Some advocate “Never say anything a kid can say!”, pushing back against traditional transmission models. Others urge teachers to “Just tell them”, emphasising the power of clear explanations. These opposing directives leave teachers caught between conflicting orthodoxies. In reality, teaching requires both explanation and exploration" 
Curriculum Tags: All
https://amiealbrecht.com/2025/01/01/stop-asking-if-we-should-tell-and-start-asking-how/

Resource Links

I love the simplicity and cleverness of @TriangleManCSD's books. Here's the latest
Curriculum Tags: All 
https://x.com/Trianglemancsd/status/1876314707789054293

Hello!

Number one way in the coming weeks to support the work that brought you Which One Doesn't Belong?, Tiling Turtles, Math On-A-Stick, and the Hierarchy of Hexagons is this:

Pop into your fave bookstore or library to ask for How Did You Count? ISBN: 9781032898353 pic.twitter.com/4XVlryIeSx

— Christopher Danielson (@Trianglemancsd) January 6, 2025

I love the comparison of various geometry apps here. Well done
Curriculum Tags: All
https://karendcampe.wordpress.com/2025/01/03/go-for-geometry/

New Blog Post: "Go For Geometry!" First in a series about using #geometry technology on ALL the platforms!

Check out the activity "Invariants" on Desmos, GeoGebra & TI calculators #MTBoS #iTeachMath #T3Learnshttps://t.co/r5VRJ6Ve1Z

— Karen Campe (@KarenCampe) January 4, 2025

Video Links

I like this because it reinforces the idea that mathematicians are not necessarily those who are the "best" at doing math but they are those who persevere when things get hard. 
Curriculum Tags: All
https://bsky.app/profile/courtneygibbons.phd/post/3leiav6d3is2p

Image Links

I love how this looks like it might be difficult but careful scrutiny can lead you to the correct solution.
Curriculum Tags: MPM2D, MCR3U
https://x.com/GeometryPuzzles/status/1875632520278200415

Only genius can solve all answers pic.twitter.com/w8qBUvmv5L

— Math Lover (@GeometryPuzzles) January 4, 2025

Math Links for week Ending Jan 3, 2024

Featured Links

This is exactly how it used to be on Twitter. It's good to see that the math community is alive and well here. Check out all the great links shared in the comments.
Curriculum Tags: All
https://bsky.app/profile/druinok.bsky.social/post/3lerifa34yk2n

Resource Links

I am always looking for ways to relate the mathematics we teach to things that occur in the real world
Curriculum Tags: MCR3U
https://bsky.app/profile/davidpetro314.bsky.social/post/3leudxtgmwk23

Some algebra, some geometry and many other topics. Take a look
Curriculum Tags: All
https://www.resourceaholic.com/2025/01/5-maths-gems-184.html

The latest set of classic NCTM calendar problems
Curriculum Tags: All
https://karendcampe.wordpress.com/2025/01/01/january-calendar-problems-3/

I highly recommend the (slow) elementary math chat if you are up for it. 
Curriculum Tags: All
https://bsky.app/profile/r-cilr.bsky.social/post/3lecw2x2t6s2s

This is a neat little problem that you might want to try when talking about types of numbers, if only to do some brute force solutions or to try to code some checks. 
Curriculum Tags: MTH1W
https://bsky.app/profile/benjamindickman.bsky.social/post/3ledrbj2edk2v

The 1st day of the new year has passed but you can still have fun with this
Curriculum Tags: All

https://x.com/MathsEdIdeas/status/1874390226229166350

By the end of today, exactly
1×2×3×4×5×6×5×4×3×2×1
seconds will have passed this year.

= 1 day
= 24 hours
= 24×60 minutes
= 24×60×60 seconds
= (2×3×4)×(5×6×2)×(5×4×3) seconds
= 1×2×3×4×5×6×5×4×3×2×1 seconds#HappyNewYear #HappyNewYear2025

— Maths Ed (@MathsEdIdeas) January 1, 2025

Video/Audio Links

A great problem when discussing the idea of average in a deeper way.
Curriculum Tags: MDM4U
https://bsky.app/profile/howiehua.bsky.social/post/3leovyr67ik25

Lots of math around the number 2025
Curriculum Tags: All
https://bsky.app/profile/howiehua.bsky.social/post/3lehbx7o54k2q

I love this proof of the area of a circle
Curriculum Tags: Gr8, MTH1W

https://bsky.app/profile/tbrzezinski.bsky.social/post/3leezazsly22g

A fun geometry video
Curriculum Tags: All
https://x.com/pickover/status/1874569819561091241

→ Mathematics, Geometry, Physics, Vibration, Packing, Tiling.

Credit: I didn’t upload this video to 𝕏. I’m pointing to a video residing in the 𝕏 stream of “interesting_aIl” (Jan 1, 2025) pic.twitter.com/BwnqcFl993

— Cliff Pickover (@pickover) January 1, 2025

Are you participating in Genuary?
Curriculum Tags: All
https://x.com/LukeSelfwalker/status/1874502239446085726

#genuary1 - Vertical or horizontal lines only.
#genuary #GENUARY2025 https://t.co/MlA73GHoll pic.twitter.com/WWaPR2FWx8

— Luke Walsh (@LukeSelfwalker) January 1, 2025

The latest OAMEtalks podcast features @LLB_315 with a preview of her members only webinar but don't let that stop you, there are some great resources that she talks about. 

Curriculum Tags: All
https://talks.oame.on.ca/season-7



A nice visualization (plus source code)
Curriculum Tags: All
https://x.com/panlepan/status/1874107178094911746

2025 is the sum of all the products in the multiplication table from 1 to 9 because:
2025 = (1+2+3+4+5+6+7+8+9)²
This @GeoGebra #MathGIF shows why we also have:
2025= 1³+2³+3³+4³+5³+6³+7³+8³+9³
⏯https://t.co/osAAevIPVe#HappyNewYear2025 pic.twitter.com/KWjLL7vJk5

— Vincent Pantal🍩ni (@panlepan) December 31, 2024

I don't try to be political here but I still think this is funny. Math to the rescue
Curriculum Tags: All
https://x.com/samtripoli/status/1874141752145396084

This is such an amazing bit, @ronnychieng! pic.twitter.com/7nVjZdM5eO

— Sam Tripoli (@samtripoli) December 31, 2024

Image Links

Perfect if you are talking about exponential relationships (you might have to talk a bit about why a black hole is a black hole though - hint you are going to be talking about super dense objects)
Curriculum Tags: MCR3U, MCF3M, MAP4C
https://xkcd.com/3033/

A challenge for proving triangles are congruent
Curriculum Tags: Gr8

https://bsky.app/profile/profsmudge.bsky.social/post/3letlcwyu2k2t

Who doesn't like a good rates of change joke?
Curriculum Tags: MCV4U
https://xkcd.com/2974/

Lots more 2025 math
Curriculum Tags: All
https://x.com/ElterEric/status/1874554980109336796

Happy New Year. To display in your classrooms. 2025 in all its forms, from school to university. Enough to awaken the curiosity of all our students, from the youngest to the oldest. #NY #NY2025 #MathematicalCuriosity #BeautyOfMathematics pic.twitter.com/rAwNxWFArD

— Eric Elter (@ElterEric) January 1, 2025

So many resources for 2025
Curriculum Tags: All
https://x.com/fawnpnguyen/status/1874205423278146042

Chiming in on the highlight of 2025. Here's my https://t.co/ENqAid9wGu #79. How many are in step 9? What is the equation?

I gave this to my 8th-grade class for our usual VP routine, not expecting an equation. However, Ben tried something & yelled, "It works!" What did he try? pic.twitter.com/LBkUD8Xpxt

— Fawn Nguyen (@fawnpnguyen) December 31, 2024

A problem that may not be as hard as it looks
Curriculum Tags: MTH1W
https://x.com/GeometryPuzzles/status/1873564341624262664

Try to solve this pic.twitter.com/fZHnoerUT9

— Math Lover (@GeometryPuzzles) December 30, 2024

You can find data anywhere
Curriculum Tags: MDM4U
https://x.com/simongerman600/status/1873805258649989610

Frequency of letters in English words and where they occur in the word. Did you know that J was the most uncommon letter? @neilrkaye always comes up with the best material! Source: https://t.co/T86PSd79NU pic.twitter.com/s0AGEnHNFI

— Simon Kuestenmacher (@simongerman600) December 30, 2024

I call this the bathingsuit problem :-)

Curriculum Tags: MTH1W
https://x.com/CoreMath80/status/1873411910131122176

#math pic.twitter.com/2uVWQIdrha

— Core Math, India (@CoreMath80) December 29, 2024