Math Links for Week Ending July 18, 2025

Featured Links

What a great build. I love when people both have great ideas and do the heavy lifting
Curriculum Tags: All
https://classroom.amplify.com/activity/6873502673785e2ffd9fc505?checkAmplifyLogin=true

Playing Mastermind with my 6 year old inspired me to make this in #Desmos. I discovered I'm a lot worse at guessing than I thought! #MTBoS #iteachmath classroom.amplify.com/activity/687...

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— Dan Wekselgreene (@dwekselgreene.bsky.social) July 13, 2025 at 2:17 PM

Resource Links

The fact that @JennaLaib continues to add to this site means it makes total sense to continue to point it out
Curriculum Tags: Gr7, Gr8, MBF3C, MDM4U
https://slowrevealgraphs.com/

There’s a bunch of new slow reveal graphs up at https://t.co/OhsfPtDqKx!

-what fraction of Nobel Prize winners for science awards are immigrants?
- where do Americans travel within the US?
- what’s more expensive: a pound of a Porsche or a pound of pecorino?
And more!

— Jenna Laib (@jennalaib) July 13, 2025

I don't think we can have too many ways to deal with the fact that AI is on the mind of both teachers and students
Curriculum Tags: All
https://kurtsalisbury.substack.com/p/when-struggle-gets-outsourced

A few weeks back, I was honored to deliver a keynote address at a summer academy for math educators. One question has stuck with me ever since. @amplifyeducation.bsky.social #iteachmath #amplify #AI #edtech. kurtsalisbury.substack.com/p/when-strug...

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— Kurt Salisbury (@kurt-salisbury.bsky.social) July 14, 2025 at 9:09 AM

This has always been an issue. Now no matter how many times you change your Desmos graph, the link will stay the same.

Curriculum Tags: All
https://help.desmos.com/hc/en-us/articles/4405901719309-Saving-and-Sharing-Graphs

Me? Typos? Never… When you save your graph, the link now automatically updates with your latest saved edits. Learn more about saving and sharing your graphs in the Desmos Help Center: help.desmos.com/hc/en-us/art... #iteachmath

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— Desmos Studio 🔜 APAC25 (@desmos.com) July 16, 2025 at 11:25 AM

Video Links

I always appreciate a visual example of the difference between Permutations and Combinations
Curriculum Tags: MDM4U
https://x.com/howie_hua/status/1945580493761908895

What's happening in the permutation and combination formulas? Let's make sense of them! pic.twitter.com/SQsbeYii0R

— Howie Hua (@howie_hua) July 16, 2025

Image Links

Here is your week 7 prompt
Curriculum Tags: All
https://bsky.app/profile/theericklee.bsky.social/post/3lu6kiexf3s2p

The penultimate week of #MathPhoto25 is #circles! Where do you notice circles, cylinders, spheres or ellipses in the world around you? #ITeachMath #MathsToday

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— Erick Lee (@theericklee.bsky.social) July 17, 2025 at 2:23 PM

Math Links for Week Ending June 20, 2025

Featured Links

I am a big fan of dynamic geometry. Whether it be Geometer's Sketchpad, Geogebra or Desmos. So I always appreciate when someone helps students work with any one of those tools. I also have a series of videos that walk you through some constructions. If you don't know a construction is when you build a geometric item that always keeps its properties (like a square). That is when you drag any of the points, it may change size or orientation but not loose the properties of that geometric figure. You can see those here
Curriculum Tags: Gr7, Gr8, MTH1W
https://fawnnguyen.substack.com/p/first-desmos-geometry-lesson

Resource Links

Quadratic formula Bingo
Curriculum Tags: MPM2D, MFM2P, MCR3U, MBF3C, MCF3M
https://mathequalslove.net/quadratic-formula-bingo-game/

NEW Quadratic Formula Bingo Game Activity (features rational, irrational, and imaginary solutions) https://t.co/3GSPMq93bv#mtbos #iteachmath pic.twitter.com/Vzw3aqjoxL

— Sarah Carter (@mathequalslove) June 19, 2025

Is everything we've been saying about the fairness of coins been (partially) wrong? Find out here:
Curriculum Tags: All

https://www.scientificamerican.com/article/scientists-destroy-illusion-that-coin-toss-flips-are-50-50/

Real coin flips are ~49-51 not 50-50 www.scientificamerican.com/article/scie... But you can guarantee equal probability with a simple trick! Flip 2x in a row starting with the same side up. HT->call it H TH->call it T HH,TT->try again (due to von Neumann en.wikipedia.org/wiki/Randomn...) #🧮 🧪 1/4

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— Joshua Grochow (@joshuagrochow.bsky.social) June 20, 2025 at 3:58 PM

Video Links

I never liked the idea of memorizing math facts. I have always thought it was better to internalize them and if you are looking for a good way to do that, try this out
Curriculum Tags: All
https://x.com/howie_hua/status/1934960810138259951

Be stronger with math facts by practicing this: pic.twitter.com/bBL0Tm7T7Y

— Howie Hua (@howie_hua) June 17, 2025

Geometry can definitely be beautiful 
Curriculum Tags: All
https://x.com/pickover/status/1935440630265602257

Mathematics.

Every minute, draw a line from the end of the minute hand, to the end of the hour hand. A wonderful pattern emerges.

By Matt Henderson, @matthen2, used with permission. [math, maths] pic.twitter.com/vj9RdMtLNS

— Cliff Pickover (@pickover) June 18, 2025

Image Links

This week's prompt for #MathPhoto25
Curriculum Tags: All
https://bsky.app/profile/theericklee.bsky.social/post/3lrxp2r4kbk2z

Week 3 of #MathPhoto25 has arrived. Where do you see lines meeting to form corners and #angles? #ITeachMath #MathsToday

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— Erick Lee (@theericklee.bsky.social) June 19, 2025 at 10:06 AM

More power to ya
Curriculum Tags: Gr8, MTH1W
https://bsky.app/profile/curiouspolymath.bsky.social/post/3ls22gniblk2w

#mathsky

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— Pete Wung The Curious Polymath (@curiouspolymath.bsky.social) June 20, 2025 at 8:35 AM

Math Links for Week Ending May 30th, 2025

Featured Links

I love this train of thought set of posts to solve this area problem with a surprising result. Take the time to go through @DavidKButler's solution, at least to see the surprising result but also to get a great example of the art of problem solving. 
Curriculum Tags: All
https://bsky.app/profile/davidkbutler.bsky.social/post/3lqdbrayyx22v

Ok let me #TryMathsLive with this from @mathforge.org …

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— David K Butler (@davidkbutler.bsky.social) May 29, 2025 at 1:50 PM

Resource Links

A great set of @Geogebra dynamic resources on angle properties from @Libro
Curriculum Tags: Gr7, G8, MTH1W
https://www.geogebra.org/m/ujsgmc8w

Video Links

As always I appreciate that he says why this works
Curriculum Tags: MTH1W, MPM2D
https://x.com/howie_hua/status/1926324656832725401

If you know one square number, you can mentally calculate the next square number! Here's how: pic.twitter.com/xyTDQNyeIG

— Howie Hua (@howie_hua) May 24, 2025

An interesting take on negative exponents

Curriculum Tags: MTH1W, MPM2D

https://x.com/howie_hua/status/1927856254405247111

Exponents are seen as repeated multiplication, but what represents repeated division? pic.twitter.com/p73voglRfL

— Howie Hua (@howie_hua) May 28, 2025

I would definitely use this problem when dealing with equations and applications of equations to have kids calculate things like the speed when hitting the water, the speed or the height, which should all be attainable from the time of the fall.
Curriculum Tags: MPM2D, MCR3U, MCF3M, MBF3C
https://x.com/davidpetro314/status/1927069513075277858

There is a #math and/or #physics problem in here. #MTBoS #iTeachMath #MathChat #iTeachPhysics https://t.co/rT5ejQgILd

— David Petro (@davidpetro314) May 26, 2025

Image Links

What math problem would you ask about this situation. Thanks to @DonFraser9 for this one
Curriculum Tags: All
https://x.com/stats_feed/status/1928170132179738754

Les Stewart typed out every number from one to one millions on his typewriter, not in number form, but spelled out. It took him 16 years. pic.twitter.com/hnwskwkZ9U

— World of Statistics (@stats_feed) May 29, 2025

Math Links for Week Ending Mar 28th, 2025

Featured Links

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

Image Links

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 Dec 27, 2024

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Given that next year, 2025, is the first perfect square year in a while, I think you may want to focus on the calculation 452 this coming year in as many ways as you can think of. 
Curriculum Tags: All
https://bsky.app/profile/geometiles.bsky.social/post/3lea5s4pxi22x

We’re about to embark on a SQUARE YEAR! #mathsky #iteachmath

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— Geometiles (@geometiles.bsky.social) December 26, 2024 at 1:58 PM

Resource Links

A less tedious way to look at factor trees
Curriculum Tags: Gr7, Gr8
https://mathequalslove.net/2025-factor-tree-puzzle/

Let's continue the countdown to 2025. Today's 2025 Factor Tree Puzzle was inspired by Dr. Harold Reiter who presented on factor tree puzzles at a math teachers' circle workshop I attended. mathequalslove.net/2025-factor-... #mtbos #iteachmath #puzzlingclassroom #mathsky #edusky

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— Sarah Carter (@mathequalslove.bsky.social) December 27, 2024 at 10:14 AM

Video Links

Hidden sinusoidal functions in nature
Curriculum Tags: MCR3U, MCF3M
https://www.reddit.com/r/oddlysatisfying/comments/28yiqk/the_sequence_of_the_sun/?rdt=53283

f(x) = sun(x). The sequence of the sun. [https://t.co/uuBMUJt5y6] pic.twitter.com/z046Gai04r

— Math Lady Hazel 🇦🇷 (@mathladyhazel) December 24, 2024

I like this because it focusses on why, not on memorizing some sort of formula
Curriculum Tags: MPM2D
https://bsky.app/profile/tbrzezinski.bsky.social/post/3ldovqhadts2i

Distance between 2 points in the coordinate plane: Active exploration for a thinking classroom. To access the exploration, see the link in the description of the featured video here: youtube.com/shorts/pfucM.... #MTBoS #ITeachMath #math #mathhelp #edusky

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— Tim Brzezinski (@tbrzezinski.bsky.social) December 19, 2024 at 5:19 PM

Image Links

I don't like this sort of thing as a memory aid, however, I think it would be great for kids to come up with it on their own or prove that it's true
Curriculum Tags:
MPM2D, MFM2P, MCR3U, MCF3M, MBF3C
https://x.com/GeometryPuzzles/status/1872106172423274843

Easy to remember trigonometric ratios pic.twitter.com/hCahSOFlLb

— Math Lover (@GeometryPuzzles) December 26, 2024

A few more "Elf on the Shelf" parodies from @Howie_Hua
Curriculum Tags: All
https://x.com/howie_hua/status/1871646638818939170
https://bsky.app/profile/howiehua.bsky.social/post/3le5q2kbr522q

You've heard of elf on the shelf, now get ready for pic.twitter.com/fMfem9qgBO

— Howie Hua (@howie_hua) December 24, 2024

Sorry, one more haha You've heard of elf on the shelf but have you heard of #math #ITeachMath #EduSky

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— Howie Hua (@howiehua.bsky.social) December 25, 2024 at 2:47 PM

Something for your Calculus class
Curriclum Tags: MCV4U
https://x.com/memecrashes/status/1871359192575160440

pic.twitter.com/8xNBT95iW2

— A meme page to check every time MatLab crashes (@memecrashes) December 24, 2024

That classic order of operations internet meme as a Christmas meme
Curriculum Tags: MTH1W
https://x.com/pickover/status/1871762165021151691

This is a math meme by @howie_hua, Used with permission.

He writes: "Be on Santa's nice list by simply conveying what you mean mathematically clearly so we can stop having these PEMDAS arguments." pic.twitter.com/IjWZDQCYr5

— Cliff Pickover (@pickover) December 25, 2024

Something to use as a starter when dealing with Order of Operations
Curriculum Tags: All
https://bsky.app/profile/bot.cowtools.org/post/3le2fzrs6sh2v

“Yes, yes, I know that, Sidney—everybody knows that! … But look: Four wrongs squared, minus two wrongs to the fourth power, divided by this formula, do make a right.”

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— THE FAR SIDE DAILY (@bot.cowtools.org) December 24, 2024 at 7:10 AM

Math Links for Week Ending Nov 1st.

Featured Links

I'm a big fan of productive struggle. Check out the comments on this post for some ideas
Curriculum Tags: All
https://x.com/TheMathGuru/status/1847412856133669057

In order for students to feel safe enough to engage in Productive Struggle, they need to feel like productive math students. Here is a thread of resources that I find helpful, inspiring & hopeful❤️‍🩹👇 #CorwinTalks

— vanessa vakharia (@TheMathGuru) October 18, 2024

Resource Links

A self checking worksheet, nice
Curriculum Tags:MCR3U, MCF3M, MBF3C
https://mathequalslove.net/big-10-solving-quadratic-equations-worksheet/

New Resource: Solving Quadratic Equations by Factoring Big 10 Activity https://t.co/fjEPSRl8oe pic.twitter.com/lLAWYjLp6O

— Sarah Carter (@mathequalslove) October 24, 2024

Get your classic NCTM calendar problems here:

Curriculum Tags: All
https://karendcampe.wordpress.com/2024/11/01/november-calendar-problems-2/

Happy November and the new Calendar of Problems is here!
Enjoy #ProblemSolving with your students or for yourself. #MTBoS #iTeachMath #T3Learns #Math #MathChat #algebra #geometryhttps://t.co/6kiw5EObVb

— Karen Campe (@KarenCampe) November 1, 2024

Video Links

You can never have enough resources to help with logistics with building thinking classrooms
Curriculum Tags: All
https://x.com/MikeFlynn55/status/1849866560330137949

Are you looking to cut down on transition times in your thinking classroom? Here’s a few ideas to help you. #buildingthinkingclassrooms pic.twitter.com/26CWQlnzrH

— Mike Flynn (@MikeFlynn55) October 25, 2024

Image Links

The Beauty is real
Curriculum Tags: All
https://x.com/pickover/status/1852366011061694560

Mathematics.

“Islamic Fibonacci Spiral.”

Source: Anita Chowdry, https://t.co/4j0uq89jX5 pic.twitter.com/dOCHgIzDO5

— Cliff Pickover (@pickover) November 1, 2024

Math Links for Week Ending Oct 26th, 2024

Featured Links

The @OAMEcounts Leadership conference is virtual this year. Check it out 
Curriculum Tags: All
https://oame.on.ca/mcis/index.php?ph=activate

I am excited to announce this year's OAME Leadership virtual event. Dr Rachel Lambert (@mathematize4all) will be sharing her session "Designing Equitable Mathematics from the Margins: UDL Math" with educators across Ontario. Register at: https://t.co/9aaYOPtO8M
Pls retweet pic.twitter.com/nQ500m5vGd

— Mark Chubb (@MarkChubb3) October 20, 2024

Resource Links

This is a neat strategy. Maybe give it a try
Curriculum Tags: All
https://docs.google.com/presentation/d/1Oq99RxhocBiV68C2cKjt85BfFGaXqJVU3E_U9CHuA8o/edit#slide=id.g1c75540970e_0_0

My favorite slide from one of my favorite talks at @NCTM. One of the biggest challenges facing math teachers (whether they know it or not!) is turning wrong answers into learning. Behold! The Super Wrong, Kinda Right continuum. /by @ottensam https://t.co/r6VuU0AY5t pic.twitter.com/BNTOu6JVEV

— Dan Meyer (@ddmeyer) October 17, 2024

Dealing with distance time graphs? Then this resource might be for you (and your students)
Curriculum Tags: MTH1W
https://x.com/DrFrostResource/status/1846914071569822009

In our new resources on Distance-Time and Speed-Time Graphs, we have included many visualisations to help students to grasp the different features of these graphs.

You can find them linked below @DrFrostMaths:

Distance: https://t.co/hTBPpuRx1U
Speed:https://t.co/pSEz6utFPz pic.twitter.com/UtNp0io065

— Dr Frost Resource Team (@DrFrostResource) October 17, 2024

Some fun with complex numbers
Curriculum Tags: All
https://x.com/LukeSelfwalker/status/1847677762049310818

Julia Sets in Desmos. Choose your own complex number for c and see what pattern you can create.https://t.co/dPKn0msMDz pic.twitter.com/X5Ia1lo8wx

— Luke Walsh (@LukeSelfwalker) October 19, 2024

Earlier this year the wodb.ca site went down but now all of the resources have been hosted by @TriangleManCSD on his Talking Math with Kids site
Curriculum Tags: All
https://talkingmathwithkids.com/wodb/

New home for #wodb is live!https://t.co/NddEDQ8wrK

Still lots of tweaks forthcoming, but most of your faves are there and easy to find.#mtbos #iteachmath

— Christopher Danielson (@Trianglemancsd) October 14, 2024

It seems simple but I think a nice way to have kids get into solving equations is to do a set of problems like this.
Curriculum Tags: MTH1W
https://www.tes.com/resource-detail/area-51-reverse-area-of-quadrilaterals-13134865

I made this towards the end of our topic on quadrilaterals (and they had previously done circles). Pupils always need more practice of working backwards, and this worked well: the difficulty ramps up nicely. Worksheet with answers is at https://t.co/olfodqTsYL pic.twitter.com/TlYjGnTSgL

— Paul Smith (@drpas1001) October 17, 2024

Video Links

I'm all for resources that take things that may seem abstract at first and make them concrete
Curriculum Tags: MPM2D, MCF3M, MBF3C
https://x.com/howie_hua/status/1848882653656977751

In high school, I didn't realize completing the square literally means to complete the square. Here's what I mean: pic.twitter.com/lSAt0uwV5q

— Howie Hua (@howie_hua) October 23, 2024

Image Links

I always like these fraction activities. 
Curriculum Tags: Gr7, Gr8
https://x.com/MathsCirclesOz/status/1847368820991938653

A neat puzzle-

1. Shade any 2 sections
2. What fraction of the square is shaded?
3. What other fractions are possible? Impossible?

This puzzle kicked off discussions at a workshop for PD Hub members. pic.twitter.com/u7i18u4cTa

— Michaela Epstein (@MathsCirclesOz) October 18, 2024

Math Links for Week Ending Oct 18th, 2024

Featured Links

I always used to start my lesson on squaring binomials with this but extended it to the form (n + a)² = n² + 2na + a² and would start by asking kids for whole numbers close to 50 and I would square them in my head before looking at the algebra that showed why it worked.
Curriculum Tags: MPM2D, MFM2P, MCR3U, MCF3M, MBF3C
https://x.com/howie_hua/status/1845116066386804979

If you know one perfect square, here's how you can mentally calculate the next perfect square: pic.twitter.com/ugD9qCOfb2

— Howie Hua (@howie_hua) October 12, 2024

Resource Links

I appreciate that @JennaLaib continues to add to her collection of slow reveal graphs and I also like the reminder that we shouldn't steer away from controversial topics. Check out some of the new graphs including the one on the correlation between gun deaths and gun laws. 
Curriculum Tags: MDM4U, MAP4C
https://slowrevealgraphs.com/

Video Links

I'm a big fan of quick dynamic student explorations, especially in geometry
Curriculum Tags: Gr7, Gr8, MTH1W
https://x.com/TimBrzezinski/status/1846846388207865990

Transversal cuts parallel lines — Quick student exploration: https://t.co/nPtWIxvdY6 @geogebra #MTBoS #ITeachMath pic.twitter.com/G5zBXcnY0I

— Tim Brzezinski (@TimBrzezinski) October 17, 2024

Image Links

If you are playing with prime numbers then this is neat. 561 is a not a prime number but by over 100 different prime tests it comes up as prime. 
Curriculum Tags: MTH1W
https://findthefactors.com/2015/07/23/561-quick-prime-number-tests/

Mathematics.

"561" is an interesting number. It gives a "false positive" to these 102 prime-number tests: https://t.co/35N3bE1DSL pic.twitter.com/FMet8xJYT6

— Cliff Pickover (@pickover) October 17, 2024

    

Math Links for Week Ending May 17, 2024

Featured Links

If you are into Building Thinking Classrooms then you might be interested in the fact that they have just redone their website. And if you head over there then you might want to start with the resource page
Curriculum Tags: All
https://www.buildingthinkingclassrooms.com/resources

The @BTCthinks team are excited to unveil the new https://t.co/B2nABK6QqI site. You'll find it full of new information on BTC, books, thinking tasks, research, events, consulting, merchandise and more! We hope the site is valuable to the #buildingthinkingclassrooms community. 1/2 pic.twitter.com/K2P7Er3uyg

— Peter Liljedahl (@pgliljedahl) May 15, 2024

Resource Links

Some fun with triangular numbers and visualizing them with @Desmos. Especially if you are introducing quadratic relations. 
Curriculum Tags: MPM2D
https://twitter.com/Desmos/status/1788205292791939202

Recursion lets us extend visual patterns like these “triangle numbers”, allowing us to define a function in terms of a previous term. What are you going to make next?
Explore the graph: https://t.co/uPcLG84L6j
Learn more about recursion: https://t.co/cBRP6ZBNUd pic.twitter.com/sjhAFhf8X7

— Desmos (@Desmos) May 8, 2024

A nice resource to visualize running probabilities
Curriculum Tags: MDM4U
https://twitter.com/jcponcemath/status/1791058715023720833

The law of large numbers states that the average result from a series of trials will converge to the expected value.@geogebra applet to explore the law of large numbers:https://t.co/R8fqVsIl5B#iteachmath #simulation pic.twitter.com/kXOsnbdoG6

— ∞ 𝕁uan ℂarlos (@jcponcemath) May 16, 2024

Here is a nice resource for understanding outliers on scatterplots
Curriculum Tags: MTH1W, MDM4U
https://twitter.com/geogebra/status/1791523353922277855

🧠👩‍🏫 GEOGEBRA RESOURCE! 👟📖

Try this FREE GeoGebra Exploration resource to experiment with how data points can affect the clusters in a scatter plot and table.
Check it out!https://t.co/DtGfyrZgyt#MTBoS #iteachmath #math pic.twitter.com/S796x3uBgD

— GeoGebra (@geogebra) May 17, 2024

Playing around with scatterplots dynamically to look at correlation
Curriculum Tags: MTH1W, MDM4U, MAP4C

Lo fácil que es hacer esto con @geogebra y lo que puede iluminar un concepto. https://t.co/qJIxm89EAt pic.twitter.com/37J6AEzmJU

— Alejandro Gallardo ۞ (@alegallardo28) May 17, 2024

Video Links

The power of doubling
Curriculum Tags: MPM2D, MBF3C, MAP4C

https://twitter.com/howie_hua/status/1789286317467341249

How many times do we need to fold a piece of printer paper in half so it is as thick as the distance between Earth and the moon? pic.twitter.com/EDZpU65gO5

— Howie Hua (@howie_hua) May 11, 2024

That famous math problem meme
Curriculum Tags: All
https://twitter.com/saravdwerf/status/1789382946840785000

Proof that math word problems happen in real life. There IS someone out there with a cart of watermelons….and it’s not a math teacher. 😂😂😂 #TikTok https://t.co/a1thIVHaTu

— Sara VanDerWerf (@saravdwerf) May 11, 2024

I like this because it gives some nice context for the difference of squares
Curriculum Tags: MPM2D
https://twitter.com/howie_hua/status/1790900918998929674

Can you mentally calculate 14×26? 35×45? 91×89? If not, see how difference of squares can help you. pic.twitter.com/TB2YwZHs6F

— Howie Hua (@howie_hua) May 16, 2024

Image Links

Are you introducing plotting on an xy plane then you might want to start with a graph like this to help get students into the meaning of the quadrants in a friendly way
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/infobeautiful/status/1788930750223438166

What's the best #dog breed, according to the data? The #dataviz dog-lovers have been waiting for: https://t.co/FvflKWXJhS pic.twitter.com/ooxFtYbxvg

— Information is Beautiful (@infobeautiful) May 10, 2024

This could be a good starter in your math class 
Curriculum Tags: All
https://twitter.com/j_lanier/status/1789233483732435037

Here are 12 dots on a 5x5 grid. No 4 of them make a square. But no matter where you add 1 more dot to this arrangement, a square gets made. (Check it!)

Can you place more than 12 dots on the grid and avoid making any squares?

If you're a teacher & this piques your curiosity... pic.twitter.com/8fKgzGKt2t

— Justin Lanier (@j_lanier) May 11, 2024

A probability question for you
Curriculum Tags: MDM4U
https://twitter.com/pickover/status/1790377113733800196

Mathematics.

Assume that Amy has a 20% chance of becoming pregnant after a romantic encounter (RE). How many REs would Amy need — to have a greater than 95% chance of becoming pregnant. pic.twitter.com/RS6CyclYhn

— Cliff Pickover (@pickover) May 14, 2024

Someone doesn't understand proportions
Curriculum Tags: All
https://twitter.com/davidpetro314/status/1790680990576193943

Something that sounds sensational but is really normal: " so 25% of every dollar is at least 25 cents" https://t.co/cdfibt5cWd

— David Petro (@davidpetro314) May 15, 2024

Math Links for Week Ending Mar 15, 2024

Featured Links

I love thinking about other ways to grade student work. There are some great ideas here if you are looking for some change
Curriculum Tags: All
https://gradingforgrowth.com/p/20-small-starts-for-alternative-grading

Today at Grading For Growth, I give 20 ways to get started with alternative grading on a small scale. Some of these are simple shifts in approach, while some are more concrete. But they are all good for students!#alternativegrading #highereducationhttps://t.co/tCsnkwm4oQ

— Robert Talbert (@RobertTalbert) March 11, 2024

Resource Links

I feel like you could do a lot of fun things in just about any class with this resource. 
Curriculum Tags: All
https://www.eatmy.art/

Playing with https://t.co/hH68olMjFJ today in class. Super easy to make animated gif images. #ITeachMath pic.twitter.com/VLumeSpQfv

— Erick Lee HRCE Math (@TheErickLee) March 8, 2024

Some more Pi Day resources
Curriculum Tags: All

https://mathsedideas.blogspot.com/2018/02/on-pi-day.html

A collection of activities for #PiDay… π history. π formulae. π birthdays. π primes. π puns and jokes. π art. Fake proofs for π. Memorising π. Continued fractions for π. Pilish. The music of π. Plus links to film, audio, websites, and articles. And more… https://t.co/SysSa3AO6R

— Maths Ed (@MathsEdIdeas) March 11, 2024

https://static1.squarespace.com/static/5436e695e4b07f1e91b30155/t/5504cbf1e4b00ffe1406e552/1426377713470/why-pi-matters.pdf

Why Pi Matters (from @NewYorker in 2015)https://t.co/n4GRBlUfUx

PDF for non-subscribers: https://t.co/c05o0asfX1

— Steven Strogatz (@stevenstrogatz) March 14, 2024

https://www.desmos.com/geometry/nm34xeu8xk

Not like we need an excuse to open up the Desmos Geometry tool, but this Archimedes-inspired strategy for approximating pi is a pretty good one. Happy Pi Day!#piday #PiDay2024 #geometry #mathproof #mathteacher pic.twitter.com/QUVhCsq5wZ

— Desmos (@Desmos) March 14, 2024

A nice visual showing sinusoidal relations
Curriculum Tags: MCR3U, MCF3M

https://twitter.com/historyinmemes/status/1767287126629245082

How to explain the math in a simple way pic.twitter.com/Ch6LVtLzpG

— Historic Vids (@historyinmemes) March 11, 2024

I have my own list of Math based podcasts (here) but this is another one and I love the way that it is organized by topic. 
Curriculum Tags: All

https://mathsedideas.blogspot.com/p/mathematics-audio-documentaries.html

An updated catalogue of links to ≈ 400 mathsy radio and podcast programmes — to dip into, relax to, share, and enjoy. Including from @stevenstrogatz @FryRsquared @alexbellos @SLSingh @tomrocksmaths @d_spiegel and many more: https://t.co/ANOXtRBZ2i

— Maths Ed (@MathsEdIdeas) March 14, 2024

Video Links

Here's a fun little proof that you could do when talking about prime numbers
Curriculum Tags: MTH1W
https://twitter.com/howie_hua/status/1766452571760402904

Did you know all prime numbers are one away from a multiple of 6 (besides 2 and 3)? Here's how we know: pic.twitter.com/D88M5qPhKp

— Howie Hua (@howie_hua) March 9, 2024

A nice representation with the Olympics coming up
Curriculum Tags: Gr7, Gr8, MDM4U
https://twitter.com/jennalaib/status/1766634206694670345

Love this one! I'm wrapping around my head around the fact that it was 2:1 male to female when I was a kid! 🤯

Here's to it being 1:1, and maybe even 1:1:x in the future, to be more inclusive... https://t.co/QJUv1vCLYL

— Jenna Laib (@jennalaib) March 10, 2024

Here is a nice visual proof of the sum of squares 
Curriculum Tags: MCR3U
https://en.etudes.ru/models/sum-of-squares/

The Sum of Squares, with a geometric proof 🧱🧱🧱https://t.co/QLGWAHfjNw (by Mathematical Etudes)#math #science #iteachmath #mtbos #visualization #elearning #geometry pic.twitter.com/AKcIuWvzHi

— Tungsteno (@74WTungsteno) November 8, 2021

Image Links

I like this because you could solve it rather elegantly with algebraic manipulation or use a more brute force method by just evaluating the powers.
Curriculum Tags: MTH1W
https://twitter.com/mehrdadbas72335/status/1767120608284799103

Easy question for you...🔥🔥🔥.
Question:
Try to find the value of x?#mathe.#Maths.#Algebra.#Geometry.#Calculus.#ProblemSolving.#test.#Exams.#puzzle.#Science.#evaluation.#solve.#ریاضی.#ریاضیات. pic.twitter.com/cjFf9yldMt

— Mehrdad Basiry (@mehrdadbas72335) March 11, 2024

Perhaps writing this in a simpler form will help?

Curriculum Tags: MTH1W
https://twitter.com/mehrdadbas72335/status/1767473786075656683

Easy question for you...🔥🔥🔥.
Question:
Try to find the value of following expression?#mathe.#Maths.#Algebra.#Geometry.#Calculus.#ProblemSolving.#test.#Exams.#puzzle.#Science.#evaluation.#solve.#ریاضی.#ریاضیات. pic.twitter.com/eszuMYrRzb

— Mehrdad Basiry (@mehrdadbas72335) March 12, 2024

Throwing shade on the standard algorithm

Curriculum Tags: All
https://twitter.com/Mathgarden/status/1767164834540343342

pic.twitter.com/AbErJVB5u9

— Sunil Singh (@Mathgarden) March 11, 2024

Here is a great problem to use when applying circle theorems
Curriculum Tags: MTH1W
https://twitter.com/sonukg4india/status/1767406915251044827

#Puzzled pic.twitter.com/9JU1PWCTxW

— SKG (@sonukg4india) March 12, 2024

I make this joke all the time
Curriculum Tags: MPM2D, MFM2P, MCR3U, MCF3M, MBF3C, MAP4C

https://twitter.com/thescottbarber/status/1767740512017293512

Jesus teaching only in parabolas pic.twitter.com/b8Yty5VTVx

— Scott Barber (@thescottbarber) March 13, 2024

    

Math Links for Week Ending Mar 8th, 2024

Featured Links

My comment about this is that this is now the nail in the coffin for traditional teaching (just telling kids stuff)
Curriculum Tags: All
https://twitter.com/ddmeyer/status/1765485851851538854

Here is an interaction I just had with a chatbot. If this was a teacher you were coaching, what would be your feedback? pic.twitter.com/ogSc0K7350

— Dan Meyer (@ddmeyer) March 6, 2024

Resource Links

I made this investigation to look at various circle theorems. However, I made two versions. One that requires much more construction and one that has far less (so it takes less time). Get them both at the link below:
Curriculum Tags: MTH1W
https://engaging-math.blogspot.com/p/desmos-activities_10.html

[New @Desmos Activity] Students Investigate circle theorems using the short version (minimal construction) or the long version (more construction) of this @DesmosClassroom activity https://t.co/JUNFclWxKi#MathChat #MTBoS #iTeachMath #MTH1W pic.twitter.com/QSgmabGist

— David Petro (@davidpetro314) March 8, 2024

Here is a nice set of dynamic visualizations for Circle theorems
Curriculum Tags: MTH1W
https://twitter.com/dment37/status/1765661861112938843

Circle theorems
Visualization |Animation | Interactive applet@geogebrahttps://t.co/s8R8SUoBzg#geogebra #math #science #iteachmath #mtbos #visualization #elearning @bancoche #Physics pic.twitter.com/SR2DoQkCwW

— Daniel Mentrard (@dment37) March 7, 2024

Do you want a reason to look at the distance formula on the coordinate plane? Then look no further
Curriculum Tags: MPM2D, MCR3U, MCF3M
https://robertkaplinsky.com/work/toys-r-us/

Sadly, there are no longer Toys 'R Us stores, but the context remains. How does a computer know how far away a store is away from you? It's similar to finding distance on a coordinate plane. https://t.co/t0jmdqBNzL pic.twitter.com/5U8gSszzs8

— Robert Kaplinsky (@robertkaplinsky) March 1, 2024

Thanks @JamesTanton for sharing this free resource. 
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/jamestanton/status/1764025344045019377

A draft of Chapter 3 of COLLEGE ALGEBRA FOR HUMANS is done. (Here are chapters 1, 2, and 3.) https://t.co/gPEvhQgZsc
I am rewriting and tightening up all my algebra notes and thoughts into one tome. I think I properly tightened up making sense of the AREA MODEL for arithmetic… pic.twitter.com/eMnp2N3n39

— James Tanton (@jamestanton) March 2, 2024

It's always nice to have extra problems for your Thinking Classrooms
Curriculum Tags: All
https://twitter.com/MathforLove/status/1764682957351231830

One of my favorites!

Here’s a fun extension of that problem - https://t.co/DclJ9GT5t9

— Dan Finkel (@MathforLove) March 4, 2024

Need a resource on Conics?
Curriculum Tags: MCR3U
https://twitter.com/MathigonOrg/status/1764667238815047690

Where do circles, ellipses, hyperbolas, and parabolas like to hang out in the summer?
Coney Island! You can make many shapes by pointing a light onto a flat surface. They might look quite different but have many properties in common. Learn more at https://t.co/zGPijgDfnx pic.twitter.com/dvR3vIOT2D

— Mathigon (@MathigonOrg) March 4, 2024

Perfect if you are dealing with your students learning about finding sidelengths with trig ratios. 
Curriculum Tags: MPM2D, MFM2P, MBF3C
https://twitter.com/TimBrzezinski/status/1764976336521527590

Here, a quick journey at my attempt to thin slice a conceptual exploration where Ss use trig ratios to solve for unknown sides of right triangles: https://t.co/iwxGfAUDcs @pgliljedahl #MTBoS #ITeachMath @thinkingclassrm @geogebra pic.twitter.com/1s4V7K587Y

— Tim Brzezinski (@TimBrzezinski) March 5, 2024

The thing I like most about this is the fact that it shows that, for the most part, effective teaching has bits of all the researched based ideas in proportions based on you. And those proportions vary from person to person when it comes to what is effective. But regardless I like @Jason_To's even keel treatment of this.
Curriculum Tags: All

https://twitter.com/Jason_To/status/1764631181734076612

Many pro-direct instruction folks are using a recent article from BNN as evidence against inquiry-based learning, thinking classrooms, etc.

I respect these people as educators who, like me, want what's best for students.

But, let's dig into what this study actually tells us. https://t.co/m9EY14Rbw0

— Jason To | 杜澤信 (@Jason_To) March 4, 2024

Get ready for PiDay with my collected Pi resources
Curriculum Tags: All
https://ca.pinterest.com/davidpetro314/pi-day/

Need some #PiDay resources?

Here is my collection including the hidden reference to Pi in the @RollingStones logohttps://t.co/PPVZPnsta8#MathChat #MTBoS #iTeachMath pic.twitter.com/fU1OHkMOKd

— David Petro (@davidpetro314) March 8, 2024

Video/Audio Links

I maybe a Desmos boy now but I used to be a TI boy so I still appreciate tips like this
Curriculum Tags: All
https://twitter.com/TICalculators/status/1763674911896183231

😮 Bet you didn't know this one. Split Screen?! 🤯🤯🤯#Iteachmath #math #teachertwitter #tips #mathnerd #mathstudent pic.twitter.com/Ec2ciacGXZ

— Texas Instruments Education (@TICalculators) March 1, 2024

Some Pi Day podcast stories
Curriculum Tags: All
https://twitter.com/storycollider/status/1765678904537149822

In honor of #PiDay, tomorrow's episode @DarthScience & @professorteds whisk you away on a journey filled with math and pastry. No matter if you're calculating circumference or slicing into a sweet treat, there's always a story to be savored. Listen wherever you get your podcasts! pic.twitter.com/G7351sfdgV

— The Story Collider (@storycollider) March 7, 2024

I'm a big fan of using zeros to subtract with integers
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/howie_hua/status/1765892156873662575

We don't always have to rely on "two negatives make a positive" when subtracting negatives. Here's another way to think about it. pic.twitter.com/FU84rlO4RO

— Howie Hua (@howie_hua) March 8, 2024

Image Links

Here is a grab from their more interactive mathematician resource 
Curriculum Tags: All
https://twitter.com/MathigonOrg/status/1763580073800577495

Next Friday is International Women's Day and is a good day to explore our all-female version of our timeline of mathematics. Can you find the mathematician with an Erdős number of 1? Download at https://t.co/VZjByDDSpO pic.twitter.com/9mwgivSuQB

— Mathigon (@MathigonOrg) March 1, 2024

How could you do on this?

Curriculum Tags: All
https://twitter.com/Anthony_Bonato/status/1764641712247394344

How would you fare in this Harvard math entrance exam? The exam was given in 1869, so no calculators allowed! pic.twitter.com/fCycZk1QrC

— Anthony Bonato (@Anthony_Bonato) March 4, 2024

Some nice proportional reasoning here
Curriculum Tags: MTH1W
https://twitter.com/gunsnrosesgirl3/status/1765471306764427691

What do you think? pic.twitter.com/kFoP8M5n41

— Science girl (@gunsnrosesgirl3) March 6, 2024

Even if you didn't make a slow reveal graph out of this, I think it would still be a good discussion with students about how long they take their showers. 
Curriculum Tags: MDM4U
https://twitter.com/davidpetro314/status/1766070035779391750

Hey @jennalaib this looks like a great candidate for a slow reveal graph https://t.co/JByZBUNYhi

— David Petro (@davidpetro314) March 8, 2024