i assume someone has already coined #mathlighting for gaslighting using mathematics but i refuse to look it up and know for sure!!

find x such that |x|<1 is a solution to: 1/(1+x²) = 6sin(x) screenshot of WolframAlpha approximation below... notice it ends with 11 7 2025, which is TODAY'S DATE coincidence?! #iTeachMath ♾️ #MathSky 🧮 — PS: what equation could you use for tomorrow's date?

who is more likely to win, according to your intuition, in a game of war? Scenario 1: Player A with 4 aces Player B with the other 48 cards Scenario 2: Player A with 4 aces and 4 kings Player B with the other 44 cards cc #iTeachMath ♾️ #MathSky 🧮

find x such that |x|<1 is a solution to: 1/(1+x²) = 6sin(x) screenshot of WolframAlpha approximation below... notice it ends with 11 7 2025, which is TODAY'S DATE coincidence?! #iTeachMath ♾️ #MathSky 🧮 — PS: what equation could you use for tomorrow's date?

i assume someone has already coined #mathlighting for gaslighting using mathematics but i refuse to look it up and know for sure!!

is there a go-to source on the importance/value of RISK TAKING in mathematics education? i see it mentioned a lot, mostly [tho not solely...] in positive senses. but i don't know who the name to associate w it would be. thanks! cc #iTeachMath ♾️

yes! read this book and feel free to fold the pages

13 years ago, well before the modern 67 craze: math.stackexchange.com/questions/23... my MSE answers of yore were frequent and hopeful. alas!

Collection of 8 integers; the mean, median, unique mode, and range: all 8 What is the biggest possible element of the collection? Source: AMC Same as above, but change 8s to 5. Source: students Same as above, but change 8s to n. Source: today's department meeting! #iTeachMath ♾️ #MathSky 🧮

messing with a new problem set for #precalc so if you want to steal the materials OR point out any errors, it will be appreciated! docs.google.com/document/d/1... thanks in advance 🙏🏻 #iTeachMath x #MathSky (not sure what hashtags are used for trig but #iTeachTrig unite!)

This is great altho the n=3 triangle has a certain nefarious quality to it... cc #MathSky 🤝 #iTeachMath

early voting wrapped up today; no voting tomorrow = Monday; if you haven't yet voted in NYC, then be sure to get it done on Election Day = Tuesday! #GOTV 🗳️ #GOTVNYC

categorizing students as "low achievers" versus "high flyers" etcetera is so offensive and unnecessary. for this reason, i strictly use "loquats" and "hydrangeas" so that no one – not the students, not other teachers, not readers of this post – can figure out how i'm academically grouping children!

problem posing context: Bingo what would be a good problem to pose? #iTeachMath ♾️ #MathSky 🧮 added context: i just attended a [slightly belated] Hispanic Heritage Month lunch, and there were multiple simultaneous Bingo winners. and now i have math on the mind! 🧠

Have seen there is a book about "mathers" (well known anagram of Amherst, hamster). How long has this term been present / popular in math edu circles? I checked my now-🔐 twittxr account and found myself using it in 2019 (and lots in 2021) but wouldn't be surprised if others coined it independently!

in #MathsToday: precalc sample questions idk that there's anything revolutionary but have a lil fun! steal as desired; lmk if you modify and improve something alt text: screenshots of the four problems that can be found here: docs.google.com/document/d/1... #iTeachMath ♾️

new @cshor.org pset 🏃💨 drive.google.com/file/d/1NaXQ... screenshots of PDF pages 1, 2, 3, and 10 below cc #iTeachMath ♾️ bcc #MathSky 🧮

new math edu paper dropped 💧 “Sometimes emotions are really beneficial and important”: Theorizing Emotional Tools of Creative Insubordination Authors: Kari Kokka Marrielle Myers Rochelle Gutiérrez worth the read! (and please 🙏🏻 read the original RG paper on creative insubordination!) #iTeachMath

where was this in 2004!! cc #iTeachMath ♾️ #iTeachCalc

Mr. D has 17 people in a class (incl himself). Oddly fascinated by the number, he decided to collect 17 candies a day, every day, for a week. He brings the candies to class and distributes them all among the 15 students (one was absent!). Prove there must be a pair of Ss who get the same # of 🍬's.

new "Meet our Desmos Fellows" is up via @desmos.com: amplify.com/meet-the-des... can you spot me???? #iTeachMath ♾️

1pm Thursday is great timing for this session! (if, unlike me, you're at NCTM Atlanta) 👇🏻

[digging through my twittxr archives] do you want non-routine quadratic problems? here are 20 💌: www.desmos.com/calculator/d... cc. #iTeachMath #MathSky #EduSky #AlgebraSky

[profession: math education] 👻 standards by learning style 🎃

another #DesmosDemo for #iTeachMath & #MathSky! check out the Emmy-award winning* show from Sara and Sean — *ok it hasn't won anything but it hasn't lost either!

in #MathsToday: four different propositions, each proved by induction. Fascinatingly, the first three (divisibility statements) were all proved using different but interchangeable methods. The full statements from the image can be found below 👇🏻

cc #iTeachMath ♾️!

LinkedOut games dropping a public leaderboard [for connections] is going to shift my playing style from wake up [first thing in the morning, still half asleep] to blitz [wait until later, play fully awake]. not sure if this is an improvement! PS: play #FiddleBrix for true 🔡 joy!! www.fiddlebrix.com

fascinating conjecture answered in the negative and elaborated: mathoverflow.net/q/501066/22971 For numbers of the form: lcm(1,2,...,n) Conjecture: All such numbers are "highly abundant" (n is HA means divisor sum n strictly > divisor sum for all naturals less than n) MO: Eventually always false!

Metro NY Problem of the Month??? yes 🙂‍↕️

"Theme: Lots of Algebra" yessss

#DesmosDemo at last!

I've seen a building with elevator digital numbers showing as: 6, 8, 1, 2, 3, 5 in that order! I will post the reason why in rot13: tnentr naq onfrzrag ohg vqx jul gur sbhegu sybbe, juvpu rkvfgf, vf vanpprffvoyr ol ryringbe rot13.com

Final output below! Not bad for a first month of school precalc project (polar graph grid in Desmos, trig coordinates, 3D print your own logo/trinket) Check out the thread below for more info and photos from the journey 📐 #iTeachMath ♾️ #MathSky 🧮 @desmos.com ✨

tho i see many anti-AI views among mathematicians and math educators, i hope that this growing list of AI uses in maths can be of some interest: seewoo5.github.io/awesome-ai-f... [found via MO Q500720 from T Tao] i was certainly surprised to see the GPT use downthread here! bsky.app/profile/benj...

so back 🚕 cc #iTeachMath x #MathSky x #EduSky bcc #MathIndustrialComplex #BigMath

"... whether we go with scripted lessons, unified curricula, and similar assessments, we have a big culture issue. Deficit thinking persists not just in NYC, but across American culture." { #iTeachMath ♾️ #MathSky 🧮 } ↘️

my favorite #sensemaking excerpt from: Kegan, Robert. The evolving self: Problem and process in human development. Harvard University Press, 1982. preview in google books: books.google.com/books?id=SP3... not overtly about 'mathematics' per se but w/e #iTeachMath ♾️ #MathSky 🧮

Finally! A citable writeup for @jennalaib.bsky.social! And, as linked in the article, there is the trove of examples freely available at: slowrevealgraphs.com #iTeachMath ♾️

and here's the other assignment ("Math Libs") that I've done with LL: docs.google.com/presentation...

"It became clear that while Oreos were the plurality winner, Rice Krispies Treats were more of the consensus choice, so we right away had a tension..." 🗳️⚖️↘️

hello #iTeachMath & #MathSky: i would like feedback! i am thinking about having ss in precalc who are learning trig create graphs with sin and cos and the polygon @desmos.com tool. goal is to do smth a lil diff and scaffold towards polar coordinates; sample graph: www.desmos.com/calculator/g...

hometown kerfuffle over the Calculus Project! brookline.news/calculus-pro...

unfortunately i didn't use the SAVE feature for a v long time! this is the first graph i saved, in Jan 2020: www.desmos.com/calculator/4... the Q was: if you have n total vertices, labeled 0 to n-1, and you jump by 1, 2, 3, 4, etc [click play on k], will you reach all of the vertices? for which n?

"opinion" "commentary" in WSJ: www.wsj.com/opinion/do-s... "Everywhere there are boys there are sports, and everywhere there are sports there are numbers. Education pairs with inclination and passes into obsession." bizarre pontification... just a dude mentioning research then unrelatedly opining:

just a fun #MathsToday counting problem my colleague set out, which was solved in an unexpected way by students: How many ways can you arrange the letters A through F such that (A comes before B) and (C comes before D)? teacher expected: 6!/4=180 (all arrangements, ½ for each condition). Instead:

In #MathsToday: Setting up the foundation for our Problem Solving & Problem Posing course! 4 problems to get students brainstorming ways of getting started, and to discuss Resources, Beliefs, Metacognition RE: solving. Then, some problems to practice writing more formal justifications. #iTeachMath

just the right read for a rainy Sunday!!

MTLT Manuscript call! *All Tasks Issue* "Do you have a go-to math task that sparks deep thinking, lively discussion, or joyful “aha!” moments in your classroom? We’d love to hear about it!" 🔗: pubs.nctm.org/fileasset/CF... Submissions due Halloween, 2025 cc #iTeachMath bcc #MathSky