Math Links for Week Ending Oct 10th, 2025

Featured Links

I know that there have been many secondary teachers waiting for this set of problems. Here's a sample
Curriculum Tags: All
https://x.com/pgliljedahl/status/1976088834212515884

Here's a sneak peek to Task 30: Graphing Linear Equations! https://t.co/gJhlhhJwnb

— Peter Liljedahl (@pgliljedahl) October 9, 2025

Resource Links

The Visual Patterns website has been around for a while but 500 patterns is still impressive
Curriculum Tags: All
https://x.com/fawnpnguyen/status/1975287062980141411

We now officially have 500 visual patterns! 🎉

Christophe from France just shared SIX wonderful building-brick patterns he discovered while playing with his daughter. 💕

Check out visual patterns #495-500: https://t.co/hobByX78Su pic.twitter.com/drwRrFh7Ki

— Fawn Nguyen (@fawnpnguyen) October 6, 2025

Video Links

If your students are learning about squares of numbers, this might be the kernel for an interesting activity about creating any odd number with the difference of squares
Curriculum Tags: Gr8, MTH1W
https://x.com/howie_hua/status/1975570637109518668

Fun mental math trick: All odd numbers can be written as the difference of two consecutive square numbers. Here's how we can do this mentally. pic.twitter.com/MDeJ5vnbxj

— Howie Hua (@howie_hua) October 7, 2025

Is he right? Have your students test it out
Curriculum Tags: MDM4U
https://x.com/howie_hua/status/1976032229643141302

Don't roast me if I am wrong but I THINK I found a new way of finding the harmonic mean???

I couldn't find any source explaining it like this, but even if it isn't new, I think it's a good way of explaining what the harmonic mean wants. pic.twitter.com/K2kMWGbirg

— Howie Hua (@howie_hua) October 8, 2025

Image Links

Math is everywhere
Curriculum Tags: MCV4U
https://x.com/pickover/status/1973775091617153511

Mathematics. Tattoos. (Image circulating widely on the Web.) pic.twitter.com/qmDHStoy6I

— Cliff Pickover (@pickover) October 2, 2025

I have always liked this fallacy based on dividing by zero
Curriculum Tags: All
https://x.com/pickover/status/1976105777799770232

Mathematics.

At bottom, we conclude that "2 = 1". pic.twitter.com/aEEkKWL8Hw

— Cliff Pickover (@pickover) October 9, 2025