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 June 13, 2025

Featured Links

I have always like @StevenStrogatz's writing. Here is some new stuff
Curriculum Tags: All
https://www.nytimes.com/interactive/2025/06/09/science/math-strogatz-taxi-geometry.html

My new #math series in the New York Times, "Math, Revealed," is aimed at everyone, whether you love math or not. Have a look! You can read it here for free without a subscription. https://t.co/M6xe5i1vPq

— Steven Strogatz (@stevenstrogatz) June 9, 2025

Resource Links

Some great resources from @MathEqualsLove
https://x.com/mathequalslove/status/1933289499234050060
https://x.com/mathequalslove/status/1932822439659995182
https://x.com/mathequalslove/status/1933519124791243006

A logic puzzle that uses inequality symbols? Futoshiki puzzles for the win! https://t.co/nj0AYUMhxH#mtbos #iteachmath #puzzlingclassroom pic.twitter.com/Gdto5JCiZJ

— Sarah Carter (@mathequalslove) June 12, 2025

During the last week of school, I had some students ask me if I had any coloring pages they could have. I didn't, but I did add "make mathematical coloring pages" to my to do list for this summer! https://t.co/c0IJv6qmw8#mtbos #iteachmath pic.twitter.com/vNepaWgqKh

— Sarah Carter (@mathequalslove) June 11, 2025

Simplifying Square Roots Bingo - my Algebra 3 students were majorly lacking this skill last year, so I decided to make a game to play at the beginning of the year to review this skill. https://t.co/X0Y2VZpOFV#mtbos #iteachmath pic.twitter.com/cJdU8PDr7h

— Sarah Carter (@mathequalslove) June 13, 2025

Video Links

I love the idea of deriving stuff from something simple you already know
Curriculum Tags: Gr7, Gr8, MTH1W
https://x.com/howie_hua/status/1933184489879982127

Teaching area formulas as how the shape is related to a rectangle helps build conceptual understanding.

Here's how to derive the area formulas of a parallelogram, triangle, trapezoid, kite, regular hexagon, and even a circle from the area formula of a rectangle: pic.twitter.com/QgiawtwJMK

— Howie Hua (@howie_hua) June 12, 2025

Image Links

This week's prompt
Curriculum Tags: All
https://bsky.app/profile/theericklee.bsky.social/post/3lrgcxo3cfk2h

Math Links for Week Ending June 6th, 2025

Featured Links

It's time for #MathPhoto25. Check out the week's theme and post your pic using the hashtag #MathPhoto2.
Curriculum Tags: All
https://bsky.app/profile/theericklee.bsky.social/post/3lquesarx7c2j

It's time to kick off #MathPhoto25 with #squares! Hunt for square shapes and perfect square numbers. Take photos & share on Bluesky using the hashtags #MathPhoto25 and #square. Please add alt text to your photos for increased access. #ITeachMath

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— Erick Lee (@theericklee.bsky.social) June 5, 2025 at 8:59 AM

Resource Links

Not only the prompt, but stuff about the thinking that may be needed to address it.
Curriculum Tags: All
https://denisegaskins.com/2025/05/29/thinking-thursday-quarter-the-square/

Thinking Thursday: Quarter the Square People learn math by playing with ideas. A math journal can be like a science lab book. #homeschooling #mathjournal #letsplaymath #mtbos #iteachmath

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— Denise Gaskins (@denisegaskins.com) May 29, 2025 at 9:01 AM

Video Links

It truly is a hurdle you have to help students overcome.
Curriculum Tags: All
https://x.com/howie_hua/status/1930317676607312031

As a math teacher, it feels like half of my job is building mathematical confidence. Here are some ways I do that: pic.twitter.com/EXHPnd23T1

— Howie Hua (@howie_hua) June 4, 2025

Image Links

This starts with an image prompt but the solution is via video.
Curriculum Tags: Gr8, MTH1W
https://x.com/TimBrzezinski/status/1930593136377549134

Can you solve this? 🤔 Solution: https://t.co/ZjcVrc6DWj pic.twitter.com/SPVsKT8dfH

— Tim Brzezinski (@TimBrzezinski) June 5, 2025

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 May 23, 2025

Featured Links

If you didn't already know, @Desmos Classroom will be turning into @Amplify Classroom. Check out this webinar for more info
Curriculum Tags: All
https://amplify.zoom.us/webinar/register/WN_zYeYp7aJRXSYkSST-uTuGA#/registration

#ICYMI: On June 28, Desmos Classroom will become Amplify Classroom as we expand to science and literacy! Drop by our webinar, where we'll discuss exciting updates to the platform experience. Gain exclusive insights into the upgraded platform. Register here:https://t.co/f3XwZfRxaj pic.twitter.com/dq72xQtJT1

— Desmos Classroom (@desmosclassroom) May 22, 2025

Resource Links

It looks like @FawnpNguyen is blogging again. Here is a nice starter activity if you are introducing or reviewing perimeter and area
Curriculum tags: All
https://fawnnguyen.substack.com/p/dot-paper-task

In Canada we got rid of the penny years ago. Still, here's a relevant Slow Reveal Graph 
Curriculum Tags: Gr7, Gr8, MDM4U
https://slowrevealgraphs.com/2022/01/09/cost-of-minting-us-coins-pennies-nickels-cost-more-than-their-face-value/







Some information on dealing with students who have Dyscalculia
Curriculum Tags: All
https://www.edutopia.org/article/teaching-students-dyscalculia

If a student is struggling in math, dyscalculia could be the reason. ➗ Here are some ways to recognize signs—and strategies designed for learners with dyscalculia. #dyscalculia #EduSky #ITeachMath #MathSky

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— Edutopia (@edutopia.org) May 23, 2025 at 12:37 PM

Video Links

This is a great way to compare fractions 
Curriculum Tags: Gr7, Gr8 MTH1W
https://x.com/howie_hua/status/1926038342602289212

A lot of people use common denominators when comparing fractions, but did you know we can use common numerators as well? Here's how we can do this: pic.twitter.com/7c6Hge6meE

— Howie Hua (@howie_hua) May 23, 2025

Image Links

A couple of Tape Diagrams for you 
Curriculum Tags: Gr7, Gr8, MTH1W
https://bsky.app/profile/duanehabecker.com/post/3lp2gq65ale2a
https://bsky.app/profile/duanehabecker.com/post/3lp2gzacchk2p

It's time for #TapeDiagramTuesday! Here's what to do: 1. Pick a problem. 2. Solve it using a tape diagram to model your thinking. - - - - OR - - - - Give the problem to your students to model. 3. Share your model with #TapeDiagramTuesday #iTeachMath

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— Duane Habecker (@duanehabecker.com) May 13, 2025 at 8:00 AM

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) May 13, 2025 at 8:05 AM

Math Links for Week Ending May 16th, 2025

Featured Links

Here is a really nice pile of apps that span topics like algebra, ratios, linear vs non linear graphs, fractions and much more.
Curriculum Tags: All
https://www.geogebra.org/m/bmyse2ca

🚨Attention #Algebra Ts, are you looking for ideas to review for a final exam❓🤔Check out this @geogebra.org collection of resources: interactive, engaging, and great for #MathPlay 🧮 🔗👇 www.geogebra.org/m/bmyse2ca #MTBoS #ITeachMath #MathSky #MathsToday #STEM #ElemMathChat #EdTech #EdChat #EduSky

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— Libo Valencia 🧮 MathPlay (@mrvalencia24.bsky.social) April 30, 2025 at 6:40 PM

Resource Links

I'm a big fan of productive struggle
Curriculum Tags: All
https://www.comap.com/blog/item/productive-struggle-in-math

💡 What if struggling in math class is actually a good thing? “Productive struggle” helps students build perseverance, problem-solving skills, and a deeper understanding of math. Read more: www.comap.com/blog/item/pr... #Math #MathEducation #ProductiveStruggle #MathTeacher

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— COMAP Math (@comapmath.bsky.social) May 16, 2025 at 11:42 AM

I have posted about Open Middle before but here is some info on using the tools on the website to create your own 

Curriculum Tags: All
https://www.openmiddle.com/

Open Middle embedded problems let you make a warm-up in 30 seconds. See how at openmiddle.com. #openmiddlemath #openmiddle #mathteacher #teacher #math #education #edu #matheducation #productivestruggle #learning

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— Open Middle (@openmiddle.com) May 14, 2025 at 10:35 PM

Some cool new resources released from @DesmosClassroom
Curriculum Tags: All
https://teacher.desmos.com/

https://teacher.desmos.com/

Video Links

I used to love doing these types of problems with students. Great for wrapping your head around infinity
Curriculum Tags: MTH1W
https://x.com/howie_hua/status/1923130416250175916

4 arguments for why 0.999...=1 pic.twitter.com/GEyC5FCGdK

— Howie Hua (@howie_hua) May 15, 2025

Image Links

Here's a juicy sequence and sum problem
Curriculum Tags: MCR3U
https://bsky.app/profile/unsolvedmre.bsky.social/post/3lpcns7ttd223

I have to say, sequence & sum problems are some of the funnest to create #iTeachMath

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— Matt Enlow (@unsolvedmre.bsky.social) May 16, 2025 at 2:27 PM

Math Links for Week Ending May 9th, 2025

 Featured Links

Most of the links are from this week's #OAME2025 conference. Here are my offerings this year
Curriculum Tags: All
http://bit.ly/oame-petro

I had a blast talking about creating activities and programming in CL in @DesmosClassroom at the @OAMElearns #OAME2025 conference. My slides are here and the recordings will be available on the virtual conferencehttps://t.co/indBLptcoZ#MathChat #MTBoS #iTeachMath pic.twitter.com/54ljrc07vG

— David Petro (@davidpetro314) May 10, 2025

Resource Links

Although this activity had a lot of moving parts, I think it was a very cool application of dividing polynomials
Curriculum Tags: MHF4U
bit.ly/PolyCodeOAME

A very cool application of polynomial division from @PGustainis at the @OAMElearns #OAME2025 conference. Here are all the resourceshttps://t.co/hwsPlB6xm2#MathChat #MTBoS #iTeachMath pic.twitter.com/1J68Utgalu

— David Petro (@davidpetro314) May 10, 2025

Some ideas on building Co-capacity with small group instruction in gr 9
Curriculum Tags: MTH1W
https://docs.google.com/presentation/d/101CIM7Q2Rg4OphEhZiX7RgsbLQqhACZBT0rYD9wfWVI/edit

Some great ideas from @aledaklassen at the @OAMElearns #OAME2025 conference on Co-Capacity building with small group instruction https://t.co/JDF9d9PIef#MathChat #MTBoS #iTeachMath pic.twitter.com/KJGAT4GJ5K

— David Petro (@davidpetro314) May 9, 2025

Some great ideas dealing with using AI in the classroom
Curriculum Tags: All
https://docs.google.com/presentation/d/1rvz8p1jglM2xUbnWd9cUZPjpk5-8pSb8CXvK8MWWLNQ/edit

Learning how to harness the power of AI in #math class and as a #math teacher from @robinmath3 at the @OAMElearns #OAME2025 conference https://t.co/vzduHWlVYa#MathChat #MTBoS #iTeachMath pic.twitter.com/vy9FAmKsG0

— David Petro (@davidpetro314) May 8, 2025

A nice keynote from @DrVCJones
Curriculum Tags: All
https://linktr.ee/dr_vcjones

Some great resources from @drvcjones on raising #MathEsteem at the @OAMElearns #OAME2025 conference https://t.co/KhTwqnUfqj#MathChat #MTBoS #iTeachMath pic.twitter.com/PMowFwaZfq

— David Petro (@davidpetro314) May 8, 2025

I love the music and art connections that can be made with #PolyPad
Curriculum Tags: All

http://bit.ly/oame-polypad

Some great #polypad resources on #art and #music and #math from @davidporas at the @OAMElearns #OAME2025 conference. A great way to start the conference offhttps://t.co/YsbRQMpcC5#MatChat #MTBoS #iTeachMath pic.twitter.com/Oy3XSOWzp2

— David Petro (@davidpetro314) May 8, 2025

Some ideas on creating a shared culture in math classroom

Curriculum Tags: All

https://docs.google.com/presentation/d/1azveudVIMvXV2p2BXu8lQz02Sn1B8JgSy0OXyiDoPCI/present?slide=id.p

Some tips on building a shared culture in #math class from @lpconnaughton.bsky.social at the #OAME2025 conference docs.google.com/presentation... #MathChat #MTBoS #iTeachMath

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— DavidPetro314 (@davidpetro314.bsky.social) May 9, 2025 at 9:52 PM

A couple of funny Math related pope posts
Curriculum Tags: All
https://x.com/LongFormMath/status/1920545813987483707
https://x.com/howie_hua/status/1920555129876492510

The new pope was a math major in college. So if a students asks you what types of jobs there are for math majors, well, there you go. Start studying those higher powers!

— Jay Cummings (@LongFormMath) May 8, 2025

Since the new Pope has a degree in math, I really hope he will say that eating pie is not a sin because sin(pi)=0.

— Howie Hua (@howie_hua) May 8, 2025

Who knew you could connect philosophy and math proficiency?

Curriculum Tags: All
https://bsky.app/profile/bielleogy.bsky.social/post/3lommeqdizs2j

Wait wait wait, are you saying reasoning is important in endeavors that require reasoning??? Another aspect why the systematic dismantling of liberal arts education is so tragic.

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— Dr. Elinne Becket (@bielleogy.bsky.social) May 7, 2025 at 8:03 PM

Video Links

Two proofs of the Pythagorean theorem
Curriculum Tags: Gr8, MTH1W
https://bsky.app/profile/howiehua.bsky.social/post/3lobkjxjnss2l

Two proofs of the Pythagorean theorem and the proof that one U.S. President submitted as a unique proof 5 years before his presidency.

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— Howie Hua (@howiehua.bsky.social) May 3, 2025 at 10:31 AM

Image Links

@NatBanting gave a great keynote on what the "basics" are. Here are some key slides
Curriculum Tags: All
https://x.com/davidpetro314/status/1920954878714589628

Some thoughts from @NatBanting about what the "basics" of math are at the @OAMElearns #OAME2025 conference #MathChat #MTBoS #iTeachMath pic.twitter.com/DQMfWlc5Tk

— David Petro (@davidpetro314) May 9, 2025

Determine the area
Curriculum Tags: MTH1W
https://x.com/ganeshuor/status/1920476200666845586

Area of the shaded region=? pic.twitter.com/WeotuwyuhD

— Ganesh UOR (@ganeshuor) May 8, 2025

Math Links for Week Ending May 2nd, 2025

Featured Links

It's the OAME annual conference this week and even though there are hundreds of face to face sessions, you can take part in the virtual version from the comfort of your own couch. Register at the link below.
Curriculum Tags: All
https://mcis.oame.on.ca/

Announcing the OAME2025 Virtual Conference. Can't make it to our in-person event? Check out our Virtual Conference option and register at https://t.co/2MQTuRrtO3. @OAMEcounts pic.twitter.com/5cHpDB9Iz9

— OAMElearns (@OAMElearns) April 15, 2025

Resource Links

The latest set of classic NCTM calendar problems.
Curriculum Tags: All
https://karendcampe.wordpress.com/2025/05/01/may-calendar-problems-3/

The May Calendar of Problems is here! Enjoy some #Math #ProblemSolving in the home stretch of your school year! Plus Bonus Article "Table Techniques" using table of values as dynamic tool w/technology. #MTBoS #iTeachMath #T3Learns #MathSky #MathsToday karendcampe.wordpress.com/2025/05/01/m...

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— Karen Campe (@karencampe.bsky.social) May 1, 2025 at 8:21 AM

Video Links

This is so fun.
Curriculum Tags: All
https://www.youtube.com/watch?v=MzMPK7OeHow

Image Links

You have to love 21st century pattern blocks
Curriculum Tags: All
https://bsky.app/profile/murrayh83.bsky.social/post/3lo4x63a73k2y

More pattern block play with heptagons–same shapes as last month, but now arranged a bit differently! #21CenturyPB #iTeachMath

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— Hana Murray (@murrayh83.bsky.social) May 1, 2025 at 2:34 PM

Some sugary data for you
Curriculum Tags: Gr7, Gr8, MDM4U
https://x.com/infobeautiful/status/1917910180387258711

Sweet teeth in the East. How much sugar in Fanta
via @simongerman600 pic.twitter.com/xOvm5Tr9Eb

— Information is Beautiful (@infobeautiful) May 1, 2025

Math Links for Week Ending Apr 25th, 2025

Featured Links

#SmudgeMath is a great way to make a question a bit friendlier and encourage work on more difficult questions. Just about any question can turn into a #SmudgedMath question but here is a bunch premade.
Curriculum Tags: All
https://www.normabgordon.com/smudgedmath-tasks

Starting to think of a spring/summer project - should I revisit and compile more #smudgedmath tasks? www.normabgordon.com/smudgedmath-... #iteachmath #MTBoS #imentormath

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— Norma B Gordon (@normabgordon.bsky.social) April 8, 2025 at 3:33 PM

Resource Links

To me this is more evidence that mathematics is something that is discovered (by any being) and not invented (by humans)
Curriculum Tags: All
https://www.npr.org/2025/04/12/nx-s1-5359438/a-crows-math-skills-include-geometry#philsky

A crow’s math skills include geometry Crows are able to look at a handful of four-sided shapes and correctly distinguish those that exhibit geometric regularity from those that don't, according to a provocative new study. www.npr.org/2025/04/12/n... #philsky #philosophy #intelligence #crows #math

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— Anita Leirfall (@anitaleirfall.bsky.social) April 24, 2025 at 4:56 PM

Video Links

Any help with understanding what fraction division means is useful.
Curriculum Tags: Gr7, Gr8, MTH1W
https://x.com/howie_hua/status/1915531531617263820

Fraction division CAN be understandable! Here are 3 ways we can think about it. pic.twitter.com/uaOPx0JLAt

— Howie Hua (@howie_hua) April 24, 2025

Image Links

I like these types of questions because, I think, at first glance they seem difficult but upon further scrutiny, they are quite do able. 
Curriculum Tags: Gr8, MTH1W
https://x.com/GeometryPuzzles/status/1914335310928101601

Simplifying radicals #radicals #algebra pic.twitter.com/OUplOLSOb3

— Math Lover (@GeometryPuzzles) April 21, 2025

Here's a nice algebra question for you 
Curriculum Tags: MTH1W
https://bsky.app/profile/PercyButtons3.mathstodon.xyz.ap.brid.gy/post/3lnjzsa5zb6n2

Here's the question for April 24th from the AMS Daily Epsilon of Math Calendar. For those unfamiliar with the calendar, the answer is always the day of the month. Looking for imaginative solutions is the aim. #mathstodon #math #maths #mathematics #MathsToday

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— Suat Ayöz (@PercyButtons3.mathstodon.xyz.ap.brid.gy) April 24, 2025 at 2:03 AM

Math Links for Week Ending Apr 18, 2025

Featured Links

It was always one of my favourite things to find something out in the wild that would connect to the curriculum I'm teaching and make students say "hmm". Make sure you check out the comments for the answer
Curriculum Tags: MPM2D, MFM2P
https://x.com/aledaklassen/status/1911424118336999774

Is there a place for this in #mth1w?https://t.co/YKQf409CAL

And... Is this true?! I don't drink coffee. #onted

— Aleda Klassen (@aledaklassen) April 13, 2025

Resource Links

I think it's important to find things that are thing that kids might be thinking of and making money on the Internet is definitely one of them.
Curriculum Tags: Gr7, Gr8, MTH1W
https://robertkaplinsky.com/work/how-much-money-do-you-earn-for-1000000-streams-on-spotify/

Looking for a real world context for multiplying and dividing decimals? Check out my problem-based lesson called How Much Money Do You Earn For 1,000,000 Streams On Spotify?
https://t.co/BULChRpJe8 pic.twitter.com/DvZqlCImV5

— Robert Kaplinsky (@robertkaplinsky) April 11, 2025

Video Links

I love a good sum of series but I also like the explanation of the conditions when this sum doesn't have an answer
Curriculum Tags: MCR3U
https://x.com/howie_hua/status/1913005710172164429

This pattern with infinite series is not a coincidence.

Also, 1+2+4+8+...=-1???

(I don't have a good title for this one but I think it's good lol) pic.twitter.com/ByLff6nErK

— Howie Hua (@howie_hua) April 17, 2025

The beauty of mathematics 
Curriculum Tags: All
https://x.com/mathladyhazel/status/1911616202448785610

Each line produces two new lines at an angle. When two collide they don't produce new ones. The result was a pleasant surprise. [https://t.co/PuUxRQRECR] pic.twitter.com/GTvb8mwpum

— Math Lady Hazel 🇦🇷 (@mathladyhazel) April 14, 2025

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I like this kind of question because it seems harder than it is but with a little care, it should be do able. Can you guess why this was published on the 18th?
Curriculum Tags: Gr8, MTH1W
https://bsky.app/profile/percybuttons3.bsky.social/post/3ln2wzqrjkq2f

Math Links for Week Ending Apr. 11th, 2025

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I really like this problem because you can take a brute force method with skills as complex as those found in gr7 & 8 or take it all the way to Calculus. I threw my hat with a dynamic geometry solution here. 
Curriculum Tags: All
https://x.com/jamestanton/status/1908437200653468022

Warm up:
Where on the diagonal should the dot be placed so that the sum of areas of the two squares is as small as possible? pic.twitter.com/S51tNtmKJM

— James Tanton (@jamestanton) April 5, 2025

Resource Links

As a calculus teacher I always found I never had enough resources to teach related rates. 
Curriculum  Tags: MCV4U
https://bsky.app/profile/theericklee.bsky.social/post/3lm653o3o5s2w

I don't know what my students will think but I had a lot of fun making this problem. #ITeachMath teacher.desmos.com/activitybuil...

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— Erick Lee (@theericklee.bsky.social) April 6, 2025 at 3:02 PM

Video Links

I always like a good visual proof of an infinite series
Curriculum Tags: MCR3U, MHF4U, MCV4U
https://x.com/howie_hua/status/1910118057080725712

Finding 1/2 + 1/4 + 1/8 + 1/16 + ... by drawing: pic.twitter.com/8I1Q07xnTU

— Howie Hua (@howie_hua) April 9, 2025

I never get tired of this animation
Curriculum Tags: Gr8, MTH1W
https://x.com/Matematickcom/status/1910253679401185742

Beautiful visualization 👍 pic.twitter.com/gyi1L0B4TP

— Matematickcom (@Matematickcom) April 10, 2025

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Makes sense to me
Curriculum Tags: All
https://bsky.app/profile/motivickyle.bsky.social/post/3lm3jfmbdts24

From my kiddo's school's math event 😍 🧮

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— χle Ormsby (@motivickyle.bsky.social) April 5, 2025 at 2:04 PM

Math Links for Week Ending Apr 4th, 2025

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Even though we can't see the presentations, I think the summaries offer some good ideas. This one is my favourite: " Don't focus on getting info INTO students' brains, more on getting info OUT!". Check out the original post to see all of the 7 for 7 presentations at the TI conference. 
Curriculum Tags: All
https://bsky.app/profile/karencampe.bsky.social/post/3lljf4p47uc2j

Last not least @jgough Jill Gough: Visualization in a Language-Rich Mathematics Class Don't focus on getting info INTO students' brains, more on getting info OUT! What is the movie you are making in your mind? Verbalize/visuals for deep learning #T3Learns #T3IC #iTeachMath

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— Karen Campe (@karencampe.bsky.social) March 29, 2025 at 12:39 PM

Resource Links

Even though some of these are most certainly university level equations, there are definitely equations here that fit into the high school math (and physics) curriculum.
Curriculum Tags: All
https://www.businessinsider.com/17-equations-that-changed-the-world-2014-3

Ian Stewart shared what he calls '17 equations that changed the course of history' www.businessinsider.com/17-equations... ianstewartjoat.weebly.com/equations.html #mtbos #iteachmath #historyOfMath

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— Dilip Barman (@dbarman.bsky.social) April 2, 2025 at 1:12 AM

Here's a nice little applet to visualize normal vectors
Curriculum Tags: MCV4U
https://www.geogebra.org/u/daniel+mentrard

The angle between two planes is a angle
between their normal vectors
Visualization |Animation | Interactive applet@geogebrahttps://t.co/23BUle1Oxk
#geogebra #math #science #iteachmath #mtbos #visualization #elearning @bancoche #physics pic.twitter.com/2G4p3jI7fw

— Daniel Mentrard (@dment37) April 1, 2025

Video Links

I think this could be used when talking about number systems (in terms of triangle numbers) or to conceptualize the patterns that exist in (this particular) sequence. 
Curriculum Tags: MTH1W, MCR3U
https://x.com/howie_hua/status/1907217126634500392

1, 3, 6, 10, ... how can we find the 100th triangular number? pic.twitter.com/RUNgaC6iaV

— Howie Hua (@howie_hua) April 1, 2025

This is a neat visualization that never occurred to me. Try it with your students
Curriculum Tags: MTH1W, MPM2D
https://x.com/howie_hua/status/1908311966017589472

Did you know we can visualize rewriting square roots? I wish I was at least shown this in school. pic.twitter.com/gnTrMGSxQz

— Howie Hua (@howie_hua) April 5, 2025

I know these are simulations, but the math checks out and they would work IRL.
Curriculum Tags: All
https://x.com/mburnsmath/status/1908145074216763552

I love these. https://t.co/5k7rRKDumM

— Marilyn Burns (@mburnsmath) April 4, 2025

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This seems like the kind of question that has brute force solutions and more elegant solutions (and code based solutions). To me that makes it perfect for all grade levels. 
Curriculum Tags: All
https://bsky.app/profile/makeaproblem.bsky.social/post/3llonl6tnpc2h

Happy Monday! This problem is inspired by the 1971 Canadian Math Olympiad Q7 Which are there more of, 2-digit numbers that are divisible by their 10s digit, or 2-digit numbers that are divisible by their unit digit? #math #maths #ProblemSolving #iteachmath #mathsky

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— Durtles (@makeaproblem.bsky.social) March 31, 2025 at 11:15 AM

Math Links for Week Ending Mar 28th, 2025

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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

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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

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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