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Sudeep @sudeepgkr.bsky.social · 11/04/2026

I imagine the typical SUV weighs less than twice the typical non-SUV car, so this seemed implausible. But it turns out that road damage is proportional to (axle weight)^4, so an SUV weighing 50% more than another car would indeed cause 5 times the damage.

Extract from linked article saying the following:

Prof Anna Goodman, of the London School of Hygiene and Tropical Medicine, said: "The typical SUV exerts around five times more force on the road than the typical passenger car. The dramatic shift to SUVs in the past 20 years - from 3% of cars on the road in England to over 30% - is expected to have played some role in increasing wear and tear damage."

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Sudeep @sudeepgkr.bsky.social · 23/03/2026

Guess how much this calculator cost in 1971 (in USD) and then watch the advert to see how close you are. www.youtube.com/watch?v=dPrR...

A screengrab from the linked YouTube video showing the calculator being held in hand to illustrate its bulkiness.

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Sudeep @sudeepgkr.bsky.social · 10/01/2026

Caught my eye on the District Line tonight 👀

Picture of a “Poem on the underground” featuring WH Auden’s Epitaph on a Tyrant

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Sudeep @sudeepgkr.bsky.social · 04/12/2025

A "premature approximation" error outside of the maths classroom! (Some comments on Root's batting average in Australia being comparable to Ponting's in England, from a thread at www.bbc.co.uk/sport/cricke...)

Post 1 states that "Root's average in Aus is only 3 less thasn Ponting's in England."
Post 2 supports this by comparing the figures: 38.33 for Root vs 41.79 for Ponting i.e. a difference of 3.46
Post 3 claims the difference is 4 if you round the figures in post 2 to 38 and 42.

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Association for Mathematics in Education @amiemathematics.bsky.social · 01/12/2025

📣 We’re excited to welcome you to the newly formed Association for Mathematics in Education! After bringing together five long-standing associations, we’re proud to unite our communities, expertise, and energy under our new association. Watch our welcome video: www.youtube.com/watch?v=1uLL...

youtube.com

Welcome to AMiE

YouTube video by Association for Mathematics in Education (AMiE)

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David K Butler @davidkbutler.bsky.social · 30/09/2025

This came up in the staff meeting today: how the ordinary English meaning of the word “independent” does not describe at all how a Venn diagram looks, and what to do to fix that. #MathSky www.adelaide.edu.au/mathslearnin...

A collection of nine diagrams. Each is a ten-by-ten grid with a four-by-five rectangle in its bottom left corner shaded with wavy lines. Each also has a five-by-six rectangle shaded in grey, overlapping with the wavy-shaded rectangle by a different amount in each diagram. They each have a label underneath too.
In the first diagram, the grey rectangle covers the wavy-shaded rectangle completely and the label says “Not independent”.
In the second diagram, the two rectangles overlap on 15 squares and the label says “Not independent”.
In the third diagram, the two rectangles overlap on 12 squares and the label says “Not independent”.
In the fourth diagram, the two rectangles overlap on 8 squares and the label says “Not independent”.
In the fifth diagram, the two rectangles overlap on 6 squares and the label says “Independent!” in capital letters.
In the sixth diagram, the two rectangles overlap on 4 squares and the label says “Not independent”.
In the seventh diagram, the two rectangles overlap on 2 squares and the label says “Not independent”.
In the eighth diagram, the two rectangles overlap on 1 squares and the label says “Not independent”.
In the ninth diagram, the two rectangles do not overlap and the label says “Not independent”.

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Sudeep @sudeepgkr.bsky.social · 24/05/2025

Nest box watching earlier today #birds

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Sudeep @sudeepgkr.bsky.social · 07/04/2025

My goodness the wooden interiors on old tube carriages made them look so warm and inviting.

Interior of London Underground 1938 stock carriage

Scalloped lighting fixture from interior of London Underground 1938 stock carriage

Another wooden interior from an old London Underground carriage

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Sudeep @sudeepgkr.bsky.social · 05/03/2025

Striking to see watch Queen Elizabeth's 1991 address to Congress today. She spoke about "the spirit of democracy", the Soviet Union, the EC, NATO, "continental insularity", and the "maintenance of international order". www.youtube.com/watch?v=egpy... (Excerpts of the speech follow below 🧵) 1/8

youtube.com

Queen Elizabeth II Address to Congress (1991)

YouTube video by C-SPAN

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Sudeep @sudeepgkr.bsky.social · 14/02/2025

The underappreciated iridescence of crow feathers. #birds

A crow holding a peanut. Its iridescent feathers are noticeable.

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Sudeep @sudeepgkr.bsky.social · 07/02/2025

A cornucopia of Peruvian orchids at Kew Gardens. Well worth a visit if you’re nearby! www.kew.org/kew-gardens/...

Orchids amongst a panoply of plants in a large glasshouse

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CantabKitty @cantabkitty.bsky.social · 14/01/2025

#mathstoday starting off Y12 conditional probability with one of my favourite worksheets featuring the Asteroid Creatures! Not sure if @davidkbutler.bsky.social has posted about it here where the sky is blue but here's the post on the other place and link drive.google.com/file/d/1dwtG...

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Sudeep @sudeepgkr.bsky.social · 13/01/2025

I previously blogged about why I like getting students to compare how tricky they might find two similar-looking Qs (bossmaths.com/which-is-eas...) Here's a new pair that I hope might generate an "aha" moment for students.

A slide asking students to compare which is easier of the following two questions:
Work out the number the is 17/33 of the way between 20/29 and 53/29
and
Work out the number is 2/3 of the way between 3/4 and 4/5

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Sudeep @sudeepgkr.bsky.social · 06/01/2025

I like mentioning #etymology links between key words from across the curriculum e.g. "vector" and "convection". Here's a topical one for today👇 (I personally don't present slides like this in class; I tend to prefer them as corridor display material.)

A poster showing that Epiphany and phenotype both come from the Greek word phainein, meaning "to appear"

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MrLevMaths @mrlevmaths.bsky.social · 06/01/2025

Had a great discussion in our department CPD about the link between student oracy, mathematical communication and understanding. How do you ensure students know which expression you mean when you are explaining? How do you explicitly teach them to talk about their maths? #MathsToday #iteachmaths

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Sudeep @sudeepgkr.bsky.social · 06/01/2025

Ages ago I used this (non-calc) Q with my KS3 & KS4 groups. None saw the answer immediately; they all tried finding Alice’s and Bob’s numbers en route to answering the Q. Used it again with selective school-bound primary Ss. Surprised none saw the answer straight away either #edusky #Mathstoday

Alice works out 748 + 525.
Bob works out 748 – 527.
What number is halfway between Alice’s answer and Bob’s answer?

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Tom Riley @riley-ed.bsky.social · 04/01/2025

First post on here, so thought I'd share something I wrote a while back. A workbook for constructions and loci. It aims to solve a few common problems:

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Jo Morgan @mathsjem.bsky.social · 02/01/2025

New! My 184th gems post. Ideas, updates and resources for maths teachers. 💎 www.resourceaholic.com/2025/01/5-ma... #UKMathsChat #MathsToday

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Sudeep @sudeepgkr.bsky.social · 23/12/2024

Given that 45 is the ninth triangular number, this must mean that 2025 = 1³+2³+3³+4³+5³+6³+7³+8³+9³ Unless someone does a Futurama, none of us will be around for the sum of the first ten cubes.

media.tenor.com

a cartoon character is holding a can of iced tea in front of a city skyline

Alt: A GIF of a cryogenically frozen cartoon character (Fry from Futurama)

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Andrew Stacey @mathforge.org · 14/12/2024

Things I have learnt from the quadratic formula. A 🧵 #ITeachMaths #UKMathsChat

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Ed Southall @edsouthall.bsky.social · 15/11/2024

I'm a bit obsessed with old textbooks for children in mathematics. Particularly from the 50s/60s both from a graphic design perspective (some are so pretty!) and a content perspective.

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Jo Morgan @mathsjem.bsky.social · 22/09/2024

New! My 181st gems post. Ideas, resources and updates for maths teachers. 💎 www.resourceaholic.com/2024/09/5-ma... #ukmathschat

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The Maths Bazaar @themathsbazaar.bsky.social · 22/09/2024

Today is September Equinox, ie Point Of Inflection Day I have made a powerpoint to show students tomorrow, especially those studying second order derivatives and concavity www.dropbox.com/scl/fi/96oxq...

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Jack Brown @tlmaths.bsky.social · 04/09/2024

The proof copy of the TLMaths A-Level Maths Textbook has arrived for us to check! Really proud of this! #ALevelMaths @danihosford.bsky.social

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Sudeep @sudeepgkr.bsky.social · 02/09/2024

Delighted to see that a new Series of Uncharted with Hannah Fry is on the way 🙂

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Peter Mattock FCCT CMgr FCMI @mrmattock.bsky.social · 31/08/2024

Finally managed to get the websites www.frayer-model.co.uk and www.more-same-less.co.uk up and running again. For any maths teachers that haven't seen them in the past (or have and found them useful!) check them out. #UKMathsChat

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Emily Rae @ecrmaths.bsky.social · 23/08/2024

In #CoreMaths I like to start the year with a lesson on using news articles to do some estimation or data calculations, to get the students talking and thinking about "real world" maths. Here are some recent news stories that I'm planning on using this year:

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Jamie Wood @jamiewoodmaths.bsky.social · 19/08/2024

Currently writing some resources for AP Calc (US qualification) and it has some amazing multiple choice questions (and longer Qs too, but the multichoice are my favourite) which would be great to use in the classroom for teaching A level. Here are a few of my favs 🧵

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Jo Morgan @mathsjem.bsky.social · 18/08/2024

New! A post that summarises some of the developments, trends and resources for maths teachers from the past year. Kind of like a mega-gems-catch-up post to make sure everyone is up-to-date. 💎 www.resourceaholic.com/2024/08/late... #ukmathschat

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Andrew Stacey @mathforge.org · 13/08/2024

Let's see if we have enough #UKMathsChat and particularly A level teachers here now! I'm going to write a short guide for incoming Y12s starting A level Maths (&FM). Much will be setting specific, but does anyone have any top tips for making a good start that I can include?

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Sudeep @sudeepgkr.bsky.social · 13/08/2024

This app at the moment feels like the start of breakfast time on the Traitors, with everyone excited to see who's going to arrive next 😅

media.tenor.com

a picture of a door with the words nickaplease88 at the bottom

Alt: A Traitors contestant entering the door to breakfast

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Ed Southall @edsouthall.bsky.social · 13/08/2024

Sadly mine have mostly gone but I do love etymology www.yesbutwhy.co.uk/blog/maths-e...

yesbutwhy.co.uk

Maths etymology (1,2,3) — yes but why?

The history and etymological connections in 1, 2 and 3.

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