I wrote about how @hpicciotto.bsky.social makes such wonderful (and useful) mathematical activities. substack.com/home/post/p-...
How Henri Picciotto Designs Great Lessons
Learning from one of the best to ever do it.
substack.com
Last week in Phoenix, a teacher filled in "school math is ___" with one word: required. New post about this deadpan truth. fawnnguyen.substack.com/p/the-anti-s...
What do mathematicians do? How do they make new mathematical discoveries? Why does that matter for K-12 math education? If you are a math teacher and you are curious about these questions, join in on "21st century mathematics" in July! Free, online, and flexible. www.youtube.com/watch?v=5UIx...
"21st century mathematics" returns in July 2026!
YouTube video by Justin Lanier
youtube.com
What do mathematicians do? How do they make new mathematical discoveries? Why does that matter for K-12 math education? If you are a math teacher and you are curious about these questions, join in on "21st century mathematics" in July! Free, online, and flexible. www.youtube.com/watch?v=5UIx...
"21st century mathematics" returns in July 2026!
YouTube video by Justin Lanier
youtube.com
Hi! In July I'm once again running a free online program for K-12 math teachers called "21st century mathematics". Its goal is to help teachers to connect math they teach with some math that has been discovered in the 21st century. Pass it along! Info+register: justinlanier.org/21st-century...
Hi! In July I'm once again running a free online program for K-12 math teachers called "21st century mathematics". Its goal is to help teachers to connect math they teach with some math that has been discovered in the 21st century. Pass it along! Info+register: justinlanier.org/21st-century...
@nhoskee.bsky.social @triangleman.bsky.social Hi! I haven't run across any Summer of Math announcements for this summer. Any updates for this or future summers at this time? Thanks!
We were invited to read from our books, which I did of course. But first I had some opening words, which I thought I'd share with you here. I'll share video too, once that's available.
Stenhouse Publishers@stenhousepub.bsky.social · 6mo ago🎉 🎉 Congratulations to How Did You Count? and author Christopher Danielson 📚📚 on winning the 2026 Mathical Book Prize. We're thrilled for the math joy that How Did You Count? brings to children, teachers, and caregivers. ❤️ www.mathicalbooks.org/2026/02/2026...
TIL that Fibonacci dedicated his famous book “Liber Abaci” to one Michael Scott. 😂
a man in a suit and tie is making a funny face
Alt: “The Office” character Michael Scott in a suit and tie looking surprised and happy.
media.tenor.com
Really nice piece on math and democracy here. (gift link) www.nytimes.com/2025/11/03/s...
Moon Duchin on the ‘Mathematical Quagmire’ of Gerrymandering
nytimes.com
If you teach Year 6 maths in the UK and you'd be willing to Zoom chat briefly with a pre-service teacher in the US for a class project, let me know? Thanks!
I presented on this problem today! You can find the slides here: docs.google.com/presentation... I don't use speaker notes (just vibes) but I think a recorded version exists and I'll try to link to it if/when I can. cc #iTeachMath ♾️ bcc #MathSky 🧮
21st Century Math [2025] Explorations from Fibonacci Nim
Explorations from Fibonacci Nim Ideas, Wonders, and Unresolved Problems Inspired by the 21st Century Mathematics 2025 Program Benjamin Dickman, Ph.D. || K-12 Mathematics Chair & Teacher Department of ...
docs.google.com
benjamin dickman@benjamindickman.bsky.social · last yr.in keeping w this program, a problem on my 🧠: A and B alternate turns. A can take any number of items, but not all, from a single pile. After that, each can take at most 3 times as many as their opponent's previous move. Whoever can't go loses; other wins. ➡️ Winning strategy for pile of 10? of N?
Yesterday I spent a fascinating morning talking maths with a group of GPs. All professions require some level of numeracy, but doctors face particular challenges when communicating mathematical ideas. I've written up a short blog: robeastaway.com/blog/gp-maths
Applications are now open for our International Visitor Program, open to #mathematicians to visit Aus 🐨 between July '26-'June 27, or March '26-June -27 (Aus/NZ citizens) 📅 Apply by Aug 1, info: mathematical-research-institute.sydney.edu.au/internationa... Please share with your networks 🔁 #MathSky
International Visitor Program - Sydney Mathematical Research Institute
IVP August 2023 applications are due 8 August 2023, for July 2024–June 2025 visits (general applicants) & March 2024–June 2025 for Australian citizens/PR & NZ citizens.
mathematical-research-institute.sydney.edu.au
“21st century mathematics”: a free month-long online enrichment program for math teachers. Info + register: bit.ly/21math2025 Video part 1:
TIL that we narrowly missing lugging around not only the monikers "imaginary", "negative", "complex", and "irrational" for numbers, but also "fictitious limits". Real glad for that. 😅 from MacTutor's "The real numbers: Stevin to Hilbert"
We are two weeks out from the start of "21st century mathematics", a program I run for K-12 math teachers. (Register now!) The program helps teachers connect the math they teach with some math that has been discovered in the 21st century. The program is flexible, free, & online.
"While everyone is glad to have a much-deserved break from the routine of early mornings and late evenings, as teachers we often end the school year thinking about the things we 'just didn’t have time to cover'." Read NCTM President @latrendak.bsky.social's full message here: nctm.link/a3H7t
Have you followed along with Math On-A-Stick and wondered what it would take to make this kind of joyful, creative math happen in your locality? Well, let's gooooooooooooooo www.mathhappens.org/math-at-the-...
Math at the Fair - MathHappens
Math at the Fair MathHappens Foundation is inviting applications for teams to participate in Math at the Fair, a project that aims to build playful and creative math experiences at fairs and similar e...
mathhappens.org
Ten squares. The first example has perimeter 14. The second one has perimeter 22. Can anyone find ones with smaller or bigger perimeters? Or other examples that match these? Intrigued? Check out "21st century mathematics", an enrichment program for teachers: justinlanier.org/21st-century...
Ten squares. The first example has perimeter 14. The second one has perimeter 22. Can anyone find ones with smaller or bigger perimeters? Or other examples that match these? Intrigued? Check out "21st century mathematics", an enrichment program for teachers: justinlanier.org/21st-century...
Are you a mathematics teacher? Would you like a taste of 21st century mathematics? See the link below to join a program for teachers run by Justin Lanier @jlanier.bsky.social —stay for as long as you like, explore with friends, & get your own insights into accessible, deep questions in math
Justin Lanier@jlanier.bsky.social · last yr.“21st century mathematics”: a free month-long online enrichment program for math teachers. Info + register: bit.ly/21math2025 Video part 1:
“21st century mathematics”: a free month-long online enrichment program for math teachers. Info + register: bit.ly/21math2025 Video part 1:
Hi! In July I'm once again running a program for K-12 math teachers called "21st century mathematics". Its goal is to help teachers to connect math they teach with some math that has been discovered in the 21st century. Pass it along! Info+register: justinlanier.org/21st-century...
21st century mathematics – 2025
An online learning experience for math teachers Registration for the 2025 program is now open! Here is the registration form. Registration will continue through the start of the program in July. Al…
justinlanier.org
Hi! In July I'm once again running a program for K-12 math teachers called "21st century mathematics". Its goal is to help teachers to connect math they teach with some math that has been discovered in the 21st century. Pass it along! Info+register: justinlanier.org/21st-century...
21st century mathematics – 2025
An online learning experience for math teachers Registration for the 2025 program is now open! Here is the registration form. Registration will continue through the start of the program in July. Al…
justinlanier.org
"𝘉𝘳𝘪𝘯𝘨 𝘐𝘵 𝘖𝘯: 𝘐𝘯 𝘐𝘵 𝘵𝘰 𝘞𝘪𝘯 and 𝘞𝘦𝘴𝘵 𝘚𝘪𝘥𝘦 𝘚𝘵𝘰𝘳𝘺 are basically the same movie. They're romeomorphic."
Find the derivative of f(x) = sin²(x) + cos²(x) in two different ways.