David K Butler
@davidkbutler.bsky.social
Maths Learning Support lecturer at Adelaide Uni (my views here). Grad Dip Ed & PhD Finite Geom. Love maths and helping people learn. he/him
Pinned
David K Butler
@davidkbutler.bsky.social
· Oct 20
Hello those drifing through BlueSky.
I mostly post about these:
* My experiences with students in the Maths Learning Centre
* Maths and maths teaching thoughts I have, including live problem-solving
* Books I read (mainly childrens fiction)
* Observations and photos of things I see in the world
I mostly post about these:
* My experiences with students in the Maths Learning Centre
* Maths and maths teaching thoughts I have, including live problem-solving
* Books I read (mainly childrens fiction)
* Observations and photos of things I see in the world
Reposted by David K Butler
A single yellow banana sits snugly in the corner at the bottom of the train door.
February 11, 2026 at 7:47 AM
A single yellow banana sits snugly in the corner at the bottom of the train door.
Reposted by David K Butler
A white bucket sits by a driveway with a large bouquet of wooden slats from an IKEA children’s bed arranged in it.
February 10, 2026 at 9:55 PM
A white bucket sits by a driveway with a large bouquet of wooden slats from an IKEA children’s bed arranged in it.
Reposted by David K Butler
A young man stands on the corner and looks down the road, leaning comically far forward and holding his arm comically high to shield his eyes with one hand.
February 10, 2026 at 9:53 PM
A young man stands on the corner and looks down the road, leaning comically far forward and holding his arm comically high to shield his eyes with one hand.
Reposted by David K Butler
February 11, 2026 at 6:45 AM
Reposted by David K Butler
February 11, 2026 at 6:42 AM
A doodle of a slug goat I made today.
February 11, 2026 at 4:34 AM
A doodle of a slug goat I made today.
A doodle of a bee I drew this week.
February 11, 2026 at 3:23 AM
A doodle of a bee I drew this week.
Reposted by David K Butler
Friends from Minneapolis reporting to me that things are at the point where folks are being hidden in other people's houses and we are in the "again" part of "never again" which the "never" was supposed to preclude
February 10, 2026 at 10:54 PM
Friends from Minneapolis reporting to me that things are at the point where folks are being hidden in other people's houses and we are in the "again" part of "never again" which the "never" was supposed to preclude
Reposted by David K Butler
Reposted by David K Butler
One a these days I will turn this into a blog post for better accessibility, but for now, here's a pdf I wrote about the various different notations for derivatives, since that's a weird and confusing thing for students first seeing all these magic symbols
rhinopotamus.github.io/pdf/derivati...
rhinopotamus.github.io/pdf/derivati...
rhinopotamus.github.io
February 10, 2026 at 6:50 PM
One a these days I will turn this into a blog post for better accessibility, but for now, here's a pdf I wrote about the various different notations for derivatives, since that's a weird and confusing thing for students first seeing all these magic symbols
rhinopotamus.github.io/pdf/derivati...
rhinopotamus.github.io/pdf/derivati...
Reposted by David K Butler
Students not quite wrapping their heads around radian measure? Let's take a look at a remedy for that.
open.substack.com/pub/vmnalex/...
open.substack.com/pub/vmnalex/...
February 10, 2026 at 9:18 PM
Students not quite wrapping their heads around radian measure? Let's take a look at a remedy for that.
open.substack.com/pub/vmnalex/...
open.substack.com/pub/vmnalex/...
Look, web microsoft office, you can tell me as many times as you like that you save as you go, but I'm still going to hit ctrl+s every time I stop. You're just going to have to deal with it.
February 10, 2026 at 8:49 PM
Look, web microsoft office, you can tell me as many times as you like that you save as you go, but I'm still going to hit ctrl+s every time I stop. You're just going to have to deal with it.
Reposted by David K Butler
And, in the very room in which he sat, there were books that could take you anywhere, and things to invent, and make, and build, and break, and all the puzzle and excitement of everything he didn't know—music to play, songs to sing, and worlds to imagine and then someday make real.
February 10, 2026 at 8:02 PM
And, in the very room in which he sat, there were books that could take you anywhere, and things to invent, and make, and build, and break, and all the puzzle and excitement of everything he didn't know—music to play, songs to sing, and worlds to imagine and then someday make real.
Reposted by David K Butler
Yeah I piqued in high school. I was like “oh that looks interesting” and then I was like “tell me more about that”
February 9, 2026 at 4:47 PM
Yeah I piqued in high school. I was like “oh that looks interesting” and then I was like “tell me more about that”
Actually molluscs in general are just fabulous.
Snails are awesome. I like snails.
February 10, 2026 at 7:46 PM
Actually molluscs in general are just fabulous.
Snails are awesome. I like snails.
February 10, 2026 at 7:11 PM
Snails are awesome. I like snails.
Reposted by David K Butler
Guys I'm just here to remind you this is the random thoughts of a comedian and not a rigorous scientific study
February 4, 2026 at 3:39 PM
Guys I'm just here to remind you this is the random thoughts of a comedian and not a rigorous scientific study
Reposted by David K Butler
Sure, I go to the library for books, but also sometimes I go just to exist in a space that's welcoming, organized, comfortable, judgement-free, and run by knowledgeable, helpful, passionate people, because that energy is straight up medicinal
February 10, 2026 at 6:25 PM
Sure, I go to the library for books, but also sometimes I go just to exist in a space that's welcoming, organized, comfortable, judgement-free, and run by knowledgeable, helpful, passionate people, because that energy is straight up medicinal
Reposted by David K Butler
Reposted by David K Butler
Illustrations for Lewis Carroll's 'Alice in Wonderland', 1959 edition, by Finnish artist and Moomins creator Tove Jansson #WomensArt
February 10, 2026 at 6:02 AM
Illustrations for Lewis Carroll's 'Alice in Wonderland', 1959 edition, by Finnish artist and Moomins creator Tove Jansson #WomensArt
Reposted by David K Butler
Hunderfossen Adventure Park in Norway (Rauraggen)
February 10, 2026 at 4:25 AM
Hunderfossen Adventure Park in Norway (Rauraggen)
Reposted by David K Butler
![Comic. [2x2 chart. Top left quadrant: seem like dinosaurs x are dinosaurs. Silhouettes of dinosaurs stegosaurus, triceratops, tyrannosaurus, velociraptor, and long-neck dinosaur. Top right quadrant: seem like dinosaurs x are not dinosaurs. Silhouettes of mosasaur, quetzalcoatlus, dimetrodon, plesiosaur, and pteranodon. Bottom left quadrant: don’t seem like dinosaurs x are dinosaurs. Silhouettes of penguin, egret, ostrich, pigeon, falcon. Bottom right: don’t seem like dinosaurs x are not dinosaurs. Silhouettes of squirrel, stapler, plant, person, and bicycle.]](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:cz73r7iyiqn26upot4jtjdhk/bafkreihcxd5wcrrf5nxz3g4riglsrccbucmdns6kxrtmtj6gjgwqibp3fi@jpeg)
February 9, 2026 at 9:10 PM
Fellow Australians: Am I doing something wrong? I don’t seem to be able to find specific Olympic events on 9Now. Only daily 15-minute highlights.
February 9, 2026 at 8:59 PM
Fellow Australians: Am I doing something wrong? I don’t seem to be able to find specific Olympic events on 9Now. Only daily 15-minute highlights.
Reposted by David K Butler
"Kind is very different from nice. Be kind, and don’t worry about nice."
Today’s advice from your Goth Auntie
-Stop slouching, drink some water, take your meds.
-Kind is very different from nice. Be kind, and don’t worry about nice.
-The Thing in the Walls offered to make handkerchiefs for me out of cat fur. I declined, but thanked it for the idea.
❤️ Auntie Jilli
-Stop slouching, drink some water, take your meds.
-Kind is very different from nice. Be kind, and don’t worry about nice.
-The Thing in the Walls offered to make handkerchiefs for me out of cat fur. I declined, but thanked it for the idea.
❤️ Auntie Jilli
February 9, 2026 at 7:42 PM
"Kind is very different from nice. Be kind, and don’t worry about nice."
Reposted by David K Butler
A little blog post about one of my favourite facts about triangle perimeter and area, and one of my favourite proofs. davidkbutler.xyz/2026/02/09/w... #MathSky #iTeachMath
When perimeter is equal to area
Some triangles have the same perimeter (in cm) as area (in cm²). For example, the 6-8-10 right-angled triangle: What properties of the triangle might signal that this sort of alignment of perimeter…
davidkbutler.xyz
February 8, 2026 at 10:25 PM
A little blog post about one of my favourite facts about triangle perimeter and area, and one of my favourite proofs. davidkbutler.xyz/2026/02/09/w... #MathSky #iTeachMath