Math Links for Week Ending July 25th, 2025

Featured Links

It's the last week of #MathPhoto25
Curriculum Tags: All
https://bsky.app/profile/theericklee.bsky.social/post/3luqgd3xjyk2b

All eight weeks of #MathPHoto25. Feel free to continue posting through the summer with any of the prompts (or combinations of prompts) you notice!

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— Erick Lee (@theericklee.bsky.social) July 24, 2025 at 4:59 PM

Resource Links

I think this would be a great way to introduce permutations
Curriculum Tags: MDM4U
https://bsky.app/profile/mathnerd1729.bsky.social/post/3lul6irptj22z

A spooky calculation I thought of 🧮 1. Choose four distinct single digits. 2. Form all three-digit numbers possible using three distinct digits from those you picked 3. Divide the sum of the three-digit numbers found by the sum of the four distinct digits. You'll always get 666, but why? #MathSky

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— Math Nerd 1729 (@mathnerd1729.bsky.social) July 22, 2025 at 2:54 PM

Video Links

I love visualizing things that we often leave to algorithms
Curriculum Tags: Gr8, MTH1W
https://x.com/howie_hua/status/1948064017182015762

Can you visualize fraction division on the number line? If not, give me around 90 seconds to explain it. pic.twitter.com/76BYRtU9DE

— Howie Hua (@howie_hua) July 23, 2025

It is always cool to see these animations because they are counter intuitive
Curriculum Tags: MCR3U
https://x.com/mathladyhazel/status/1947716757872898371

These trigonometric functions are so satisfying. [https://t.co/OMtZF8tOja] pic.twitter.com/dhBD2wA5WS

— Math Lady Hazel 🇦🇷 (@mathladyhazel) July 22, 2025

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Math humour for the inverse trig fans
Curriculum Tags: All
https://x.com/howie_hua/status/1947680988760576220

...Oh, I thought I read sec(c). https://t.co/EyEJ8neolV pic.twitter.com/1JKTZCC7uY

— Howie Hua (@howie_hua) July 22, 2025

I'm not sure if "hilarious" is correct but, yes, I would totally make this joke in class :-)
Curriculum Tags: MDM4U
https://x.com/mathladyhazel/status/1947379949268074811

This math joke is hilarious! pic.twitter.com/dYN9cthq5U

— Math Lady Hazel 🇦🇷 (@mathladyhazel) July 21, 2025

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 Jul 11th, 2025

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I love when people post videos like this that, to the untrained eye, do not seem like they are math related but in this case, it's a perfect video that is both quirky and can be related to rates of change. 
Curriculum Tags: Gr7, Gr8, MTH1W
https://bsky.app/profile/malmeida.bsky.social/post/3lsvylgzogs2i

New unit rate context just dropped #MTBOS #ITeachMath

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— Marco (@malmeida.bsky.social) July 1, 2025 at 11:17 AM

Resource Links

It seems like @mathequalslove is an endless supplier of great math resources. Thanks
Curriculum Tags: MTH1W
https://bsky.app/profile/mathequalslove.bsky.social/post/3ltnalupl3c2p

Rational Exponents Bingo Game for Algebra 2/Precalculus (And just pretend the word equation actually says expression. That's what I get for copying and pasting...) mathequalslove.net/rational-exp... #mtbos #iteachmath #puzzlingclassroom #mathsky #edusky

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— Sarah Carter (@mathequalslove.bsky.social) July 10, 2025 at 5:11 PM

Video Links

The math is relatively simple but the error checking of credit cards is pretty quick because of it. 
Curriculum Tags: All
https://x.com/howie_hua/status/1943299871957524906

Here is my credit card number. First come, first serve. pic.twitter.com/FsdzpzzOZr

— Howie Hua (@howie_hua) July 10, 2025

Image Links

This week's topic is up
Curriculum Tags: All
https://bsky.app/profile/theericklee.bsky.social/post/3ltmwkvwksk26

Week 6 of #MathPhoto25 is is underway! Where do you see measurements or tools used to #measure. Think measurements for distance, area, weight, time, etc. #ITeachMath

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— Erick Lee (@theericklee.bsky.social) July 10, 2025 at 2:12 PM

Math Links for Week Ending Jul. 4th, 2025

Featured Links

If @StevenStrogatz is telling you directly then you should probably do it.
Curriculum Tags:All
https://x.com/stevenstrogatz/status/1939642259701403807

My "Math, Revealed" series is freely available to anyone -- no paywall! -- in the thread below

— Steven Strogatz (@stevenstrogatz) June 30, 2025

My latest for @nytimes.com -- please repost so your followers can see this for free. www.nytimes.com/interactive/...

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— Steven Strogatz (@stevenstrogatz.com) June 30, 2025 at 6:33 AM

Resource Links

If you are working with roots and Pythagoras Theorem then you could use this as a prompt to come up with shapes that have roots of any natural number. 
Curriculum Tags: MTH1W
https://x.com/pickover/status/1940194570144559554

Math.

Beautiful Universe. Don't you just love √3 here? pic.twitter.com/cpKTPhqnOb

— Cliff Pickover (@pickover) July 1, 2025

Video Links

I always appreciate a visual proof
Curriculum Tags: MCR3U
https://x.com/howie_hua/status/1940883205466607888

Fun math fact: If you divide the first n positive odd numbers by the next n odd numbers, you will ALWAYS get 1/3. Here's why! (With a visual included!) pic.twitter.com/PfF55gyJsP

— Howie Hua (@howie_hua) July 3, 2025

Image Links

This week's prompt
Curriculum Tags: All
https://bsky.app/profile/theericklee.bsky.social/post/3lt2sk7kxcs2t

Week 5 of #MathPhoto25 is #five. Where do you see 5 objects or the number 5? #ITeachMath

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— Erick Lee (@theericklee.bsky.social) July 3, 2025 at 9:12 AM