Iva Sallay
@findthefactors.bsky.social
Wife, Mom, Grandma, Recreational Mathematician, High School math specialist, creator of the Find the Factors puzzles. I IGNORE ALL DMs.
On the third anniversary of me starting to create Maths Sheep Play Sheep, a blog post about its creation, and the meaning and decisions behind every sheep. davidkbutler.xyz/2026/08/23/m... #MathSky
Maths Sheep Play Sheep
It’s Children’s Book Week in Australia, and so it’s a good time to write a little something about a project I did in honour of Book Week in 2023: a picture book called “Math…
davidkbutler.xyz
As an academic, I have decided to pre-empt AI taking my job, so I am going to take ITS job! I am going to start hallucinating, lying to my students, and drinking 700,000 litres of water
How many ways can 5 couples sit in a row given that each person needs to sit next to their partner?
Some things on @transum.bsky.social just do the job so well. Loved using this Venn paint task with my 10s today-- set notation went the best it has with this. #MathsToday
Happy Birthday to M. C. Escher born on June 17, 1898. It's also World Tessellation Day in honor of Escher's iconic tiling and morphing art. 🧶 Celebrate with knitting patterns inspired by Escher's artwork like these on my tessellation knitting post intheloopknitting.com/escher-knitt...
Here are a few more curved origami pieces I made. Technically, I made them so the crease lies in the same plane. But if I make the strips narrow enough relative to the object's size, you can get the over-and-under behavior to work pretty well. I could have made all of these except the 5₁ knot
Today I was reading about and playing with curved origami. Here's what I designed and made. It is cool how folding along the curve changes the shape of the object (like the M → ❤️).
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is 0. #mathsky #iTeachMath
Rough Desmos graph trying to illustrate how the integral of (sin(nx))^2 from -pi to pi is pi. www.desmos.com/calculator/y...
Desmos | Graphing Calculator
desmos.com
What are your FAVORITE math tasks? What are CLASSIC math tasks? What is one math task EVERYONE should do in their lifetime? (any level, short, long - what math should us math teachers be engaging in?)
Pengu Pudgy with Telescope
ALT: Pengu Pudgy with Telescope
static.klipy.com
Agree or disagree? Arguments for more 'real-life' maths often overlook its lack of relevance/applicability to teenage life. Pupils are more likely to be intellectually engaged by challenge and unfamiliar ideas than by simulations of adult life. #UKMathsChat #MathsToday #iTeachMath
Ice cream sales and drowning incidents both rise in summer. Does eating ice cream cause drowning? Of course not — but this is exactly the sort of trap statistics can set. hemelprivatetuition.blogspot.com/2026/05/why-... #ALevelMaths #Statistics #MathsEducation #ExamRevision
Not what I was expecting to see when I graphed the situation. www.desmos.com/calculator/r... Need to get pencil and paper to investigate fully 😀 #ALevelMaths #MathsToday
1977 puzzle
desmos.com
Problem for 30th April, 2026 from the @dailyepsilon.bsky.social calendar #Math #MathSky #MathToday #Mathematics
A new little blog post called "Too many presents". davidkbutler.xyz/2026/04/07/t...
Too many presents
Once upon a time when my daughter was very young, she was given a lot of presents – it was a birthday or Christmas but I can’t remember which. What I do remember is that she played with just …
davidkbutler.xyz
One of my favourite fraction facts is that (a+b)/(c+d) is between a/c and b/d. So I am certain that 2/7 is between 1/4 and 1/3.
Howie Hua@howiehua.bsky.social · 7mo agoIt's Mental Math Monday with guest Riccardo from Italy. Can you think of a fraction between 1/4 and 1/3 where the denominator is less than 10?
Want to merge math and art? Check out Daily Desmos. People submit Desmos graphs and students' goal is to replicate it. dailydesmos.com/
This is the second in a series of videos exploring popular #mathshacks or #mathstricks and the understanding behind why they work. In this hack I explore the trick that allows you to square numbers close to 100 mentally. Watch the full video here: youtu.be/ZkXl7aaYKaw
Understanding Maths Hacks: Squaring numbers close to 100.
YouTube video by Peter Mattock
youtu.be
Saving this to show the next student who comes to lesson without a pen 🤣
Tomorrow is #PiDay, the perfect excuse to celebrate the most famous number in Maths! If you're looking for a quick classroom starter, puzzle or activity for 14 March, take a look at my Pi Day page: www.transum.org/Intro/Starte... #Maths #MathChat #Teachers #PiDay2026
I hate how math is forced to continuously justify itself by its uses and it can't just be allowed to stand on its own. Humans have done art for thousands of years because that's what humans do. It's the same with math. Humans reason about pretend things that don't matter, and that's okay.
