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Erick Lee @theericklee.bsky.social · 13h

Halloween is just around the corner. I made a Halloween treat esti-mystery to share with students. #ITeachMath docs.google.com/presentation...

A 2L bucket is filled with Halloween candy... how many pieces of candy are there?

The first two of six clues are revealed. Clue #1 - the answer is a three digit number. Clue #2 - The answer is an even number.

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Reposted by Erick Lee

OAME 2026 Annual Conference @oamelearns.bsky.social · 18d

Apply now to be a presenter at OAME 2026 - Let’s Talk Math. We are looking for diverse session proposals under the following themes:
Let’s talk equity
Let’s talk assessment
Let’s talk technology
Let’s talk content
Let’s talk pedagogy
We would love to have you!!!! bit.ly/callforproposals2026

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Erick Lee @theericklee.bsky.social · 1d

Has rotational or reflective symmetry. Concave/convex. All straight sides (polygon) or non-straight sides (eg circle).

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Reposted by Erick Lee

Desmos Studio @desmos.com · 2d

We know ball. And okhsv, oklab, and oklch. 🎨

📝 Learn more about new custom color functions in the Desmos Help Center: help.desmos.com/hc/en-us/art...

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Erick Lee @theericklee.bsky.social · 2d

An engaging narrative. Check out this review. aperiodical.com/2025/08/revi...

aperiodical.com

Reposted by Erick Lee

Mike Jacobs @mikejacobs.bsky.social · 3d

Start your week with this #yohaku. Fill in cells with 9 different factors of 198 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 198 in a 3 by 3 grid. The numbers in the top row add to 39. The numbers in the middle row add to 119. The numbers in the bottom row add to 13. The numbers in the left column add to 14. The numbers in the middle column add to 33. The numbers in the right column add to 124.

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Reposted by Erick Lee

DavidPetro314 @davidpetro314.bsky.social · 3d

[New Post] Ontario Math Links-My favourite #math related links from this week:

ontariomath.blogspot.com/2025/10/math...

Links&help from @howiehua.bsky.social @karencampe.bsky.social @quantamagazine.bsky.social @dawndelvecchio.bsky.social @calarmstrong.bsky.social &more #MathChat #MTBoS #iTeachMath

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Reposted by Erick Lee

Amanda Austin @draustinmaths.com · 3d

✨New A-level resources from this week's Year 12 lessons on graphical inequalities, algebraic fractions and algebraic division. The new A-level section is slowly growing! www.draustinmaths.com/a-level
#MathsToday #ALevelMaths #UKMathsChat

A-level Maths task on finding the remainder when dividing a polynomial by a linear expression using algebraic long division.

A-level Maths task on shading regions in two dimensions divided by linear and quadratic inequalities.

$A-level Maths tasks on (i) solving linear and quadratic inequalities graphically, and (ii) simplifying algebraic fractions either by splitting the fraction or by factorising.$

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Tommaths (he/him) 🏳️‍🌈🏳️‍⚧️ @teakayb.mathsy.space · 7d

A quick bit of #Maths in #Museums: The shape of castles and their keeps and towers.

tommaths.blogspot.com/2025/10/math...

#MathsToday #MuseumEd

tommaths.blogspot.com

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Reposted by Erick Lee

Karen Campe @karencampe.bsky.social · 8d

October is here & so is the next month's #ProblemSolving calendar!

Share your thinking (& your students' thinking) here or on the post.
#MTBoS #iTeachMath #T3Learns #RecreationalMath #MathsToday

karendcampe.wordpress.com/2025/10/01/o...

October Calendar Problems

October is here, and with it the crisp fall air here in the northeast US. No matter where you are, you can get a breath of fresh air with some problem solving in your math classes! Here is the 2015…

karendcampe.wordpress.com

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Reposted by Erick Lee

Miss Morris @morrismaths359.bsky.social · 9d

#Mathstoday
Year 10 found expressions for shaded areas.
Made this last year for an extension but it was nice spending a bit longer on it.

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DavidPetro314 @davidpetro314.bsky.social · 10d

[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2025/09/math...

Links and help from @diffgeom.com @robertkaplinsky.com @howiehua.bsky.social @edutopia.org @jennalaib.bsky.social and more #MathChat #MTBoS #iTeachMath

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Reposted by Erick Lee

Daniel Wilson @helsig.bsky.social · 11d

I was calling this geometric fade but I learned it is actually called parquet deformation.

A parquet deformation based on squares. Created in Excel and Krita.

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Reposted by Erick Lee

transum.bsky.social @transum.bsky.social · 11d

There are over 1500 distinct activities on the Transum Mathematics web site. However you'll be pleased to know that there is a search page. It's not AI so works best when you use just one or two words.

www.transum.org/Search_Form....

Hope you find what you need.

#maths #mathschat #mathstoday

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Reposted by Erick Lee

Marco @malmeida.bsky.social · 12d

This is always a fun day in precalc - lots of friendly arguments

Series of questions on domains of various functions

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Erick Lee @theericklee.bsky.social · 13d

Created a binary number esti-mystery. Students practicing powers by working with binary and base 10 number conversions. The final clue is a bit of a giveaway. Check out this site for lots of examples: stevewyborney.com/category/est... #ITeachMath #MathsToday

A box of marbles. Students estimate the number of marbles with binary numbers. 5 clues are given, one at a time, for students to revise their estimate.

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Reposted by Erick Lee

Howie Hua @howiehua.bsky.social · 16d

Would you rather have $200 or a stack of quarters as tall as you?

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Erick Lee @theericklee.bsky.social · 16d

Measurements taken. Happy Equinox!

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Reposted by Erick Lee

Darth Calculus @darthcalculus.bsky.social · 16d

Really disappointed that I can't make measurements for today's #equinox. But that doesn't mean you can't!

Solar noon is in about an hour and half for the Eastern time zone. I'd love to see you participate!

sites.google.com/view/themeas...

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Reposted by Erick Lee

DavidPetro314 @davidpetro314.bsky.social · 17d

[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2025/09/math...

Links and help from @mathsjem.bsky.social @edutopia.org @howiehua.bsky.social @murrayh83.bsky.social #MathChat #MTBoS #iTeachMath

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Reposted by Erick Lee

Emily Myers @emilymyers.bsky.social · 19d

The best way for a photo to catch my attention is if it looks like data.

Fig. 1. Bar plot displaying amount of storage per filing cabinet.

(Filing cabinets lined up in a row at the side of the road.)

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Reposted by Erick Lee

Rebecca, House of Ogg @earthlingnoreally.bsky.social · 19d

#BlueSkyArtShow #Angles #AlphabetChallenge #WeekLforLines #ColorADay #GreenSat #SaturdayStairs #StripesOnSaturday

Zigzag escalation - 2025

#Phonetography
#EastCoastKin #ArtYear #handrailsteps #clinginglife #pointy

Handrail casting zigzag lines on cement stairs. Green grass grows in the corners and green mildew stains the cement.

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Erick Lee @theericklee.bsky.social · 19d

My copy of The Mathematicians’ Library arrived! A medley of my favourite topics: mathematics, books and history. Really enjoying it so far. @teakayb.mathsy.space

The Mathematicians’ Library by Thomas Briggs

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Reposted by Erick Lee

🅢🅗🅔🅔🅝🅐 @sheena-mck.bsky.social · 23d

#AlphabetChallenge #WeekLforLines

Lines of tiles, vents, and wood along edge of swimming pool

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Reposted by Erick Lee

transum.bsky.social @transum.bsky.social · 23d

Statistics Supplied is a great exercise for deepening students' understanding of mean, median, mode and range. It's the reverse of the traditional exercise.

Have a go at the first few questions yourself!

www.transum.org/Intro/?ID=1114

#mathsresources #mathschat #mathstoday #mathchat

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