Erick Lee

The 2025 Desmos Art Contest gallery is now live 📣! Filter by feature and find your new favorite graph at desmos.com/art 🎨
#mathsky #iteachmath #mathart

The Mathematics of Origami by Joseph O’Rourke

I’m reading The Mathematics of Origami by @josephorourke.bsky.social. A great read with well explained math. We’ll be exploring some of these topics and open questions with our high school math club. #ITeachMath

My favourite method of solving this was to rotate the circle to simplify the problem. Not many students saw this way of thinking about the problem at first. www.desmos.com/calculator/k... #ITeachMath

A math problem. Find the red area given a cirlce and square.

Started the first day of Calculus class with a problem from @stevemaths.bsky.social. Students used several different strategies to calculate the red area. #ITeachMath

[New Podcast] It's the
@oamecounts.bsky.social #OAME2026 Day 2preview. Featuring Dr. Pamela Seda @cluzniak.bsky.social Marian Small & Ian VanderBurgh. Listen here:

talks.oame.on.ca/season-8

Check out all the
@oamelearns.bsky.social conference info at oame2026.ca
#MathChat #MTBoS #iTeachMath

Don’t give up yet… 3 likes in 3 days, at that rate you’ll be calling it maths on Dec. 29th, 4763.

A finished game of Inverse.

Playing a few quick games of Inversé with my son. Just 5 pieces and 3 rules. My favourite part is that each block has different dimensions but the same volume. #mathplay

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

ontariomath.blogspot.com/2026/01/math...

links and help from @edutopia.org @howiehua.bsky.social @murrayh83.bsky.social and more #MathChat #MTBoS #iTeachMath

3D prints of a hyperbolic paraboloid

3D prints of a elliptic paraboloid

3D prints of slices of a hyperbolic paraboloid

I created some OpenSCAD code to print these slices/traces of surfaces for a multivariable calculus class. I wrote about it on my blog and included a link to my GitHub page with the code.
divisbyzero.com/2026/02/01/3...

OAME2026 is excited to announce you can now register for your conference sessions in MCIS! mcis.oame.on.ca
Visit www.oame2026.ca for more info. #OAMElearns #Edchat #Letstalkmath.

February Calendar Problems February is here and if you need a distraction from winter weather ❄️, I have the February 2016 Calendar of Problems from 10 years ago for some wintertime problem solving enjoyment. I have a few mo…

Time for winter #ProblemSolving! Here's the February Calendar of Problems for you and your students.

Tell us your working out here or on the post. ENJOY!
#MTBoS #iTeachMath #RecreationalMath #MathSky #MathsToday #T3Learns

karendcampe.wordpress.com/2026/02/01/f...

I really enjoyed listening to your conversation with @nhoskee.bsky.social. This podcast episode was thought provoking and insightful.

STAT-Z STAT-Z Each turn, deal each player 7 cards. (Playing cards, or numbered cards like 1-20.) Like Yahtzee, each turn, you fill in one scoring category. Instead of the rerolling, in this game you have two...

Yahtzee-like #mathgame for statistics, with some #geogebra support docs.google.com/document/d/1...

YouTube video by UK Maths Trust Introduction to IMC 2026.

📽️ View the Intermediate Mathematical Challenge 2026 Video Solutions

Website: ukmt.org.uk/video-soluti...

YouTube: www.youtube.com/watch?v=YUFl...

#mathstoday #UKMT

The next episode of the Mathematical Objects podcast, in which we chat to the lovely @nhoskee.bsky.social about what objects we consider mathematical, and why, is out now!: aperiodical.com/2026/01/math...

Those stained glass creations are amazing. That is quite the skill to both teach and to learn.

Day 5 of the math art class I’m teaching is complete. Today involved finishing up the stained glass window pieces and doing more hitomezashi stitching.
#mtbos #mathart

A selection of 6 questions using proportional reasoning in different contexts with the same numbers. A prompt saying 'Which is the odd one out?'

A selection of 6 questions using linear relationships in different contexts with the same numbers. A prompt saying 'Change each question to make the answer 43.'

A selection of 6 questions involving reciprocals in different contexts with the same numbers.

A selection of 6 questions involving manipulating a given multiplication in different contexts.

I'd consider these to all be in the realm of Different Surface Same Deep, I reckon.

Some more available here:
interwovenmaths.com/daydream-int...
and here: interwovenmaths.com/making-conne...

Here's a few of my favorite activities to engage middle school mathers. Check 'em out!

docs.google.com/presentation...

#iteachmath

THE PROJECT — Dear Data

via my favorite librarian www.dear-data.com/theproject pretty amazing #mathart #dataviz project

Use 9 different factors of 270 in a 3 by 3 grid. The numbers in the top row add to 37. The numbers in the middle row add to 195. The numbers in the bottom row add to 22. The numbers in the left column add to 62. The numbers in the middle column add to 183. The numbers in the right column add to 9.

Start your day with this #yohaku. Fill in cells with 9 different factors of 270 to get totals shown in each row/column. #mathsky #iTeachMath

Be stronger with mental multiplication by thinking about a rectangle

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

ontariomath.blogspot.com/2026/01/math...

links and help from @tbrzezinski.bsky.social @howiehua.bsky.social @benjamindickman.bsky.social @curiouspolymath.bsky.social and more #MathChat #MTBoS #iTeachMath

A fun problem. Did this with my son. A good chance to focus on problem solving strategies. #ITeachMath

Diagram shows an overlapping square and circle on a graph: Centre of circle is at the origin (0,0), The side lengths of the square are equal to the diameter of the circle. Find the exact area of the shaded region of the diagram. The points of intersection are at (-3,4), (-3,-4) and (3,-4). The region of the square that is shaded is outside of the circle. The region of the circle that is shaded is outside the square.

Here's our Friday #OCRMathsPuzzle.

Find the exact area of the shaded region of the diagram.

The shaded region of the square is outside of the circle. The 2 shaded regions of the circle are outside the square.

#UKMathsChat #MathsToday #Geometry #RecreationalMath
@cambridgeocr.bsky.social

A screenshot of four functions, a picture of a square and the command "Match each function to what it does." The four functions: a) Calculate the area of a square given its diagonal. b) Calculate the diagonal of a square given its area. c) Calculate the perimeter of a square given its area. d) Calculate the area of a square given its perimeter.

I think this could be a nice task to bring together Area, Perimeter, Pythagoras and Inverse functions.

With the main idea that functions are meant to do something useful with an input!

Pentel Kerry pencil

Pentel Kerry is my favourite mechanical pencil right now.

Completed differentiation dominoes activity

In #MathsToday #AlevelMaths perfected their differentiation skills which included dominoes, they are very much ready to move on to some applications next week.

Problem of the Week 156!

Please do not comment the solution so others can work it out too. Instead, like this post or comment a thumbs up if you think you have the correct answer!

The solution will be posted in the comments on Thursday afternoon.

#Problem #UKMT #Maths

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

ontariomath.blogspot.com/2026/01/math...

links and help from @theericklee.bsky.social @momath.bsky.social @howiehua.bsky.social @afetter29.bsky.social @mathowitz.bsky.social & more #MathChat #MTBoS #iTeachMath