Nous sommes un jour puissance
27 = 3³
9 = 3²
25 = 5²
2025 = 45²
27/09/2025 → 27092025=(5205)²
09/27/2025 → 9272025=(3045)²

Trouvé par @talljerome.bsky.social

Watch these numbers do-si-do🎶

Full equations in PDF document here drive.google.com/file/d/1OP3c...

Pac-Man animation created with ONE equation line (+ one additional line for slider) in @desmos.com by my student Maddy. I chipped in with the disappearing dots. www.desmos.com/calculator/v...

Simple puzzle in @geogebra.org, slide discs to opposite sides of the track www.geogebra.org/m/yqbqjafv

Wow, and "persistent links" so "each time you press Save, the link will stay the same" 😍 Not sure why this and better file management took so terribly long to address, but I'll just be grateful it finally happened!

When a good Math problem yields a surprisingly tidy solution, that can be fun. But sometimes I really appreciate it when the problem refuses to spit out those tired old tidy numbers you've seen n→∞ times before. @geogebra.org www.geogebra.org/m/yfdjuqta #calculus #optimization

Two identical cylinders bump into each other at a corner... www.geogebra.org/m/ennzeuek @geogebra.org #calculus

Surface area of a sphere, intuitive approach with @geogebra.org ? #calculus
www.geogebra.org/m/eb3ndfur

Totally illegal "cancelling" of fractions that still yields the correct result 😱

Mardi Gras today, so time for the once-a-year shearing

My solution to the puzzle: When does this flawed application of the zero-product property still yield correct solutions? www.dropbox.com/s/m8zyey3we4...

I believe misunderstanding of needing a zero, for my students at least. Or beyond “misunderstanding,” often no compulsion to understand why it works in the first place. Curious how that might vary across schools.

And this post elsewhere from user @potetoichiro

Wow, down another rabbit hole, and there are more of those than I thought! Along the way I saw another post attributing this one to James Tanton: 12345679/98765432 = 1/8

Great question for advanced students: Under what conditions does this flawed application of the zero-product property produce correct results? (Of course, ask with caution, at risk of creating more confusion🫠)

I wish I didn't have to ever see this again! Too often having to remind that the ZERO product property actually requires a zero on one side of equation. But at least here's one contrived case where the incorrect algebra yields a correct solution 😜

Every December a math meme makes the rounds in which an equation is algebraically rearranged to yield "merry = x-mas." Not really trying to be grinchy, but in the interest of providing an alternate viewpoint:

Same for hs→undergrad. Maybe Math teachers are more inclined to consider that only 1 in 20 are top 5%, but others may rank half their students as top 5%. And does my assessment of top 10% look unfavorable to another teacher's top 5%, even though our populations might be totally different?