Erick Lee
@theericklee.bsky.social
High School Math Teacher | Desmos Fellow | Nova Scotia Math Teachers Assn President. #ITeachMath. I occasionally blog about math at https://pbbmath.weebly.com/
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
February 7, 2026 at 2:55 AM
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
February 6, 2026 at 1:15 AM
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
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
February 6, 2026 at 1:10 AM
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
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
February 1, 2026 at 9:28 PM
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
Pentel Kerry is my favourite mechanical pencil right now.
January 22, 2026 at 12:27 PM
Pentel Kerry is my favourite mechanical pencil right now.
My son is practicing Pythagorean Theorem at school so he is squaring lots of two digit numbers. Showed him the “close together method” I learned recently from Arthur Benjamin’s book The Magic of Math. I’ve been using this method lots now that I know why/when it works.
January 15, 2026 at 11:40 PM
My son is practicing Pythagorean Theorem at school so he is squaring lots of two digit numbers. Showed him the “close together method” I learned recently from Arthur Benjamin’s book The Magic of Math. I’ve been using this method lots now that I know why/when it works.
Had a wonderful evening at MoMath for the 2025 Rosenthal Prize presentation. It was great to meet everyone and to chat about the intersection of math, magic and music. @momath.bsky.social
January 15, 2026 at 4:09 AM
Had a wonderful evening at MoMath for the 2025 Rosenthal Prize presentation. It was great to meet everyone and to chat about the intersection of math, magic and music. @momath.bsky.social
Haven’t played Scrabble in years but my son has gotten in to it. I think Wordle has made me a better player. It’s really a math game disguised as a word game.
January 14, 2026 at 7:57 PM
Haven’t played Scrabble in years but my son has gotten in to it. I think Wordle has made me a better player. It’s really a math game disguised as a word game.
Did this problem with some students today during our lunch time math club. We checked our solution using a @desmos.com graph. www.desmos.com/calculator/i...
January 8, 2026 at 9:51 PM
Did this problem with some students today during our lunch time math club. We checked our solution using a @desmos.com graph. www.desmos.com/calculator/i...
I’ve reached the Dad era when I’m getting Lego for Christmas instead of just giving it. Built it this evening with a bit of help/supervision from my son.
January 5, 2026 at 2:36 AM
I’ve reached the Dad era when I’m getting Lego for Christmas instead of just giving it. Built it this evening with a bit of help/supervision from my son.
Playing one last game of Letters to Santa before putting it away until next December. I am loosing most egregiously.
January 3, 2026 at 1:31 AM
Playing one last game of Letters to Santa before putting it away until next December. I am loosing most egregiously.
"I've not seen such bravery"
December 30, 2025 at 8:52 PM
"I've not seen such bravery"
And the triakis icosahedron from 30 Sonobe units.
December 24, 2025 at 6:40 PM
And the triakis icosahedron from 30 Sonobe units.
And the Sonobe Octohedron. static1.squarespace.com/static/5754f...
December 22, 2025 at 4:29 PM
And the Sonobe Octohedron. static1.squarespace.com/static/5754f...
An origami cube from Sonobe units. Nice instructions from #mathscraftnz. #ITeachMath static1.squarespace.com/static/5754f...
December 22, 2025 at 4:12 PM
An origami cube from Sonobe units. Nice instructions from #mathscraftnz. #ITeachMath static1.squarespace.com/static/5754f...
Can anyone recommend a good book for high school on the mathematics of origami? #ITeachMath
December 19, 2025 at 8:42 PM
Can anyone recommend a good book for high school on the mathematics of origami? #ITeachMath
Folding and cutting stars from regular pentagons at the Citadel HS math club today. Students had fun with origami and made some decorations to take home. #ITeachMath #HRCEMath
December 18, 2025 at 9:02 PM
Folding and cutting stars from regular pentagons at the Citadel HS math club today. Students had fun with origami and made some decorations to take home. #ITeachMath #HRCEMath
Attended a session of NS Math Circles this evening at Dalhousie Univ. I was introduced to the Cops and Robbers vertex pursuit game. #ITeachMath anthonybonato.com/a-new-prehis...
December 18, 2025 at 2:21 AM
Attended a session of NS Math Circles this evening at Dalhousie Univ. I was introduced to the Cops and Robbers vertex pursuit game. #ITeachMath anthonybonato.com/a-new-prehis...
Folding mathy holiday origami ornaments this morning using patterns from @hitomezashibot.bsky.social.
December 14, 2025 at 1:35 PM
Folding mathy holiday origami ornaments this morning using patterns from @hitomezashibot.bsky.social.
Playing DroPolture with my son. It already had the jingle bells so we just had to swap out the ghost piece for Santa and we had a holiday version of the game. oinkgames.com/en/games/ana...
December 11, 2025 at 11:07 PM
Playing DroPolture with my son. It already had the jingle bells so we just had to swap out the ghost piece for Santa and we had a holiday version of the game. oinkgames.com/en/games/ana...
Had a fun day working with several groups of middle school students. We folded and cut pentagons and stars using instructions from @paulakrieg.bsky.social. Revealed the mathematical geometry in the folds and shapes. #ITeachMath bookzoompa.wordpress.com/2017/11/09/p...
December 10, 2025 at 8:47 PM
Had a fun day working with several groups of middle school students. We folded and cut pentagons and stars using instructions from @paulakrieg.bsky.social. Revealed the mathematical geometry in the folds and shapes. #ITeachMath bookzoompa.wordpress.com/2017/11/09/p...
Made a mathy origami snowflake using patterns from @hitomezashibot.bsky.social. #ITeachMath #ChristmasOrigami youtu.be/MbhlVfLtcaM?...
December 10, 2025 at 12:46 AM
Made a mathy origami snowflake using patterns from @hitomezashibot.bsky.social. #ITeachMath #ChristmasOrigami youtu.be/MbhlVfLtcaM?...
Thinking about geometry vocabulary and diameter vs diagonal. Students seem to be much more familiar with diameter of a circle than they are with the diagonal of a polygon. #SameDiffMath #ITeachMath
December 8, 2025 at 11:26 PM
Thinking about geometry vocabulary and diameter vs diagonal. Students seem to be much more familiar with diameter of a circle than they are with the diagonal of a polygon. #SameDiffMath #ITeachMath
Playing Schotten Totten with my son. Plays a bit different with a Gen Z when you start a run with 6, 7. We’re playing a different game each day for advent. #ITeachMath
December 7, 2025 at 3:13 AM
Playing Schotten Totten with my son. Plays a bit different with a Gen Z when you start a run with 6, 7. We’re playing a different game each day for advent. #ITeachMath
Folding a few origami 5 pointed stars using instructions from @paulakrieg.bsky.social and patterns from @randomtiling.bsky.social and @tilingbot.bsky.social. Some mathy holiday decorations! #ITeachMath
December 6, 2025 at 7:41 PM
Folding a few origami 5 pointed stars using instructions from @paulakrieg.bsky.social and patterns from @randomtiling.bsky.social and @tilingbot.bsky.social. Some mathy holiday decorations! #ITeachMath