In place value error and #unitchat news...

Had our Grade 5/6 lunch club fair this morning. Some clubs drew crowds with food. The Math Art table drew crowds with play : ) #MathArt

Launch day 🚀 We’ve just released @chartlecc.bsky.social - a daily chart game! Your job is to guess which country is represented by the red line in today's chart. You get 5 tries, no other clues! Play today, come back tomorrow for a different chart with new data and share with your chart friends 📈

Got to see both the women's doubles finals on Sunday and the men's doubles quarter finals on Friday at the Queen's (HSBC) Championships in London last week. #MathPhoto2025 #even

Bernar Venet's 17 Acute Unequal Angles (2016) at London's Frieze Sculpture 2017. #MathPhoto2025 #Angles.

Alicja Kwade's WeltenLinie (2017) at the Venice Biennale and the Hayward Gallery in London. It brings to mind #symmetry, but isn't quite symmetrical at all. #MathArt25

Two very different James Turrell pieces (Deer Shelter Skyspace at the Yorkshire Sculpture Park in 2009 and Leading at Friends Seminary in 2025) #MathPhoto25 #square

#HandsOff London, April 2025

Dishonest charts are coming from all directions, and they're only going to hit harder. Unless we push back. So, an interactive guide: Defense Against Dishonest Charts flowingdata.com/projects/dis...

The fifth year of our MS Math Art Lunch Club is off to a gentle start. Fewer kids than previous years, but still the same amount of joy. Today was the first time in all these years that we explored the Fold and Cut Theorem. Lots of exploration, trial and error, and imagination! #MathArt

Pretty amazing #dataviz of super-wealth. mkorostoff.github.io/1-pixel-weal... So hard to get the scale. #socialjusticemath

Shared this video with my kiddos today and they loved it! I also learned that the un-cancelled cancelled Leap Day happened in 2000. I had no idea back then. thekidshouldseethis.com/post/how-doe...

The Math Art Lunch Club kiddos had so much fun with the small spirograph sets I cut from scrap acrylic...they even started making little spirograph monsters! It was 30 mins of play and joy. What's not to love? I dream of cutting a large spirograph that will work with chalk outdoors.

So, apparently in Switzerland, you can regularly buy eggs in boxes of 4, 6, 10 or 15, and also, there are brightly colored eggs year round! #unitchat #eggchat @triangleman.bsky.social

Hat tile contest winners are in! www.nytimes.com/2023/12/10/s...

The Math Art Lunch Club that I run for Grade 5-8 kiddos once every fortnight is just the loveliest. Even on a busy week, there is lots of joy.