Hi! In July I'm once again running an 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: https://justinlanier.org/21st-century-mathematics-2026/
A Teacher’s 12-year Journey: Marcus Elbel shares how curriculum and ideas from www.mathed.page helped improve his students’ engagement and learning.
Reaching Consensus on curricular and pedagogical matters can improve the effectiveness of a math department and improve student learning. I suggest a pathway in this post.
And a couple from Cecil Hunt's My Favourite Howlers (1951) https://archive.org/details/myfavouritehowle0000ceci/page/44/mode/2up?q=polygon
'A polygon is a man with more than one wife, preferably living'
'A polygon with seven sides is called a hooligan'
A couple of mathematical howlers from Just My Typo compiled by Drummond Moir (2012):
'A triangle which has an angle of 135 degrees is called an obscene angle.'
'A polygon is a man who has many wives.'
And a misprint misled a couple into thinking that they won the lottery https://eu.theledger.com/story/news/2010/05/21/woman-sues-lottery-in-battle-over-scratch-off-ticket/26272066007/ Apparently they lost their lawsuit https://www.the-sun.com/news/8623798/lottery-ticket-misprint-lawsuit-florida-anna-maria-curcio/
Mathematics Teaching 300 now available online https://atm.org.uk/Mathematics-Teaching-Journal-Archive/177735
A special edition celebrating 300 issues with a self-referential cover, like MT 150 (https://en.wikipedia.org/wiki/Droste_effect)
Design by me
Five free articles for non-members:
Understanding geometry proof what do students say to AI feedback? https://atm.org.uk/write/MediaUploads/Journals/MT300/06.pdf
Yuqian (Linda) Wang and Hanmin Song explore whether personalised AI feedback can support students’ understanding of geometry proof tasks.
An appreciation of Alison Parish (1951–2026) https://atm.org.uk/write/MediaUploads/Journals/MT300/07.pdf
Can pedagogy for problem solving promote equity in the classroom? https://atm.org.uk/write/MediaUploads/Journals/MT300/10.pdf
Laura King reflects on pedagogies to support equity in primary mathematics when teaching problem solving
Number a disinformation timeline https://atm.org.uk/write/MediaUploads/Journals/MT300/16.pdf
Micheál Ó Dúill traces history and cultures to argue for teaching zero to nine instead of one to ten.
If it hadn’t been for Dave… https://atm.org.uk/write/MediaUploads/Journals/MT300/18.pdf
Barbara Binns reflects on Dave Wilson (1947–2026) with contributions from Geoff Faux and Tony Brown.
#MathematicsTeaching #iTeachMath #MathEd #MathsEd #Math #Mathematics #teaching #pedagogy #didactics #education #design #GraphicDesign #AMiE #MT #MT300 #recursion #DrosteEffect #number
Want to earn continuing education credits and gain techniques in teaching #datascience to students attend our Data Science Training! Secure your spot here: http://go.osu.edu/datasciencetraining or here for teachers in Texas: https://docs.google.com/forms/d/e/1FAIpQLSfGzzp_CyNeiOwBH-f_WMKvz9Wy3QvO2xjy13a9Heh2kh1oGg/viewform
We look forward to seeing you there! #Iteachmath #Iteachphysics
Justin Lanier
Henri
STEMcoding Project
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