Erick Lee
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theericklee.bsky.social
Erick Lee
@theericklee.bsky.social
700 followers 420 following 320 posts
High School Math Teacher | Desmos Fellow | Nova Scotia Math Teachers Assn President. #ITeachMath. I occasionally blog about math at https://pbbmath.weebly.com/
Posts Replies Media Videos
Reposted by Erick Lee
davidpetro314.bsky.social
[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2026/02/math...

Links and help from @colleenyoung.bsky.social @karencampe.bsky.social @alicekeeler.com @howiehua.bsky.social @johngolden.bsky.social and more
#MathChat #MTBoS #iTeachMath
February 15, 2026 at 5:47 PM
Reposted by Erick Lee
amplifyeducation.bsky.social
✨ Computation Layer made simple!

Join this free webinar to learn how CL works behind the scenes in Amplify Classroom and how to use it in your own custom activities.

🗓️ Join us Feb. 23 at 7:30 p.m. ET: go.amplify.com/3K5FQVi.
Amplify Classroom | Professional learning webinars
Discover how to implement interactive lessons and tools for math, literacy, and science with our upcoming free Amplify Classroom webinars.
go.amplify.com
February 13, 2026 at 10:05 PM
Reposted by Erick Lee
desmos.com
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
February 6, 2026 at 4:01 PM
theericklee.bsky.social
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
The Mathematics of Origami by Joseph O’Rourke
February 7, 2026 at 2:55 AM
theericklee.bsky.social
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
A math problem. Find the red area given a cirlce and square.
February 6, 2026 at 1:10 AM
Reposted by Erick Lee
davidpetro314.bsky.social
[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
February 3, 2026 at 7:04 PM
theericklee.bsky.social
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
A finished game of Inverse.
February 1, 2026 at 9:28 PM
Reposted by Erick Lee
davidpetro314.bsky.social
[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
February 1, 2026 at 5:42 PM
Reposted by Erick Lee
divbyzero.bsky.social
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...
3D prints of a hyperbolic paraboloid 3D prints of a elliptic paraboloid 3D prints of slices of a hyperbolic paraboloid
February 1, 2026 at 7:08 PM
Reposted by Erick Lee
oamelearns.bsky.social
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 1, 2026 at 5:38 PM
Reposted by Erick Lee
karencampe.bsky.social
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...
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…
karendcampe.wordpress.com
February 1, 2026 at 3:41 PM
Reposted by Erick Lee
johngolden.bsky.social
Yahtzee-like #mathgame for statistics, with some #geogebra support docs.google.com/document/d/1...
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...
docs.google.com
January 31, 2026 at 7:39 PM
Reposted by Erick Lee
ukmathstrust.bsky.social
📽️ View the Intermediate Mathematical Challenge 2026 Video Solutions

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

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

#mathstoday #UKMT
Introduction to IMC 2026.
YouTube video by UK Maths Trust
www.youtube.com
January 30, 2026 at 8:31 AM
Reposted by Erick Lee
steckl.es
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...
aperiodical.com
January 30, 2026 at 10:12 AM
Reposted by Erick Lee
samjshah.bsky.social
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
January 29, 2026 at 1:37 AM
Reposted by Erick Lee
nathanday.bsky.social
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...
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.
January 28, 2026 at 10:37 PM
Reposted by Erick Lee
jsandford.bsky.social
Here's a few of my favorite activities to engage middle school mathers. Check 'em out!

docs.google.com/presentation...

#iteachmath
January 27, 2026 at 4:31 PM
Reposted by Erick Lee
johngolden.bsky.social
via my favorite librarian www.dear-data.com/theproject pretty amazing #mathart #dataviz project
THE PROJECT — Dear Data
www.dear-data.com
January 19, 2026 at 7:07 PM
Reposted by Erick Lee
mikejacobs.bsky.social
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
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.
January 26, 2026 at 3:44 PM
Reposted by Erick Lee
howiehua.bsky.social
Be stronger with mental multiplication by thinking about a rectangle
January 25, 2026 at 6:37 PM
Reposted by Erick Lee
davidpetro314.bsky.social
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
January 25, 2026 at 4:55 PM
Reposted by Erick Lee
stevemaths.bsky.social
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
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.
January 23, 2026 at 10:59 AM
Reposted by Erick Lee
studymaths.bsky.social
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!
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.
January 23, 2026 at 8:00 AM
Reposted by Erick Lee
neechmaths.bsky.social
In #MathsToday #AlevelMaths perfected their differentiation skills which included dominoes, they are very much ready to move on to some applications next week.
Completed differentiation dominoes activity
January 21, 2026 at 8:47 PM
Reposted by Erick Lee
ukmathstrust.bsky.social
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
January 20, 2026 at 8:00 AM