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jrlarsen

@room51.co.uk
141 followers 472 following 159 posts

Author of React Hooks in Action and Get Programming with JavaScript. Learner of Japanese and teacher of maths, computing and English. Exploring web components for mathematics education. 5minutemfl.com

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Reposted by jrlarsen
Jonathan Hall @studymaths.bsky.social · 24/09/2026
Update: I tidied up the Example-Problem pair tool a bit today. My favourite feature is the ability to compare any two objectives side by side - making use of variation. Here's a simple example for the volume of a sphere. mathsbot.com/unitExample?...
Two problems side-by-side where you are asked to find the volume of a sphere. One where the radius is given, the other with the diameter given.
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Manuel Matuzović @matuzo.at · 23/09/2026
Tomorrow at 6 am CEST I'm sharing 19.5 things you didn’t know about accessibility in HTML and CSS online at @inclusivedesign24.bsky.social Join us for a full day of great talks on accessibility! inclusivedesign24.org/2026/schedule/
inclusivedesign24.org
Inclusive Design 24 (#id24)
A free 24-hour online community event on accessibility and inclusion
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jrlarsen @room51.co.uk · 20/09/2026
It’s not finished yet but could this be useful for any #MFL teachers? 5minutemfl.com #LanguageLearning #EduSky #MFLBluesky #langchat
5minutemfl.com
5 Minute MFL
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Burton Smith @stuffbreaker.bsky.social · 21/09/2026
Lately, I've been exploring CSS-only custom elements. They're pretty rad! #html #css #webcomponents dev.to/stuffbreaker...
dev.to
CSS-Only Custom Elements
Build real, composable web components using markup and CSS, with no JavaScript
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jrlarsen @room51.co.uk · 20/09/2026
It’s not finished yet but could this be useful for any #MFL teachers? 5minutemfl.com #LanguageLearning #EduSky #MFLBluesky #langchat
5minutemfl.com
5 Minute MFL
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zeldman @zeldman.bsky.social · 18/09/2026
“Let me make it clear: without people at the top of their game sharing their experience and knowledge—regardless of whatever ‘game changing’ technology is in place—we are pulling up the ladders and committing our industry to stagnation and death.” bell.bz/youll-miss-p...
bell.bz
You’ll miss publishers when they’re gone
Ever since Piccalilli started to get traction, I’ve always seen CSS-Tricks, Smashing Magazine and A List Apart (among others) as peers. We all help each other behind the scenes and importantly, back…
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Jonathan Hall @studymaths.bsky.social · 19/09/2026
I've rolled this out to some of the other manipulatives now. - Cuisenaire rods - Dienes Blocks - Place Value Counters - Prime Factor Tiles - Fraction Wall mathsbot.com/manipulative... #MathsbotToday
mathsbot.com
Manipulatives - MathsBot.com
A huge collection of virtual manipulatives. Algebra Tiles, Dienes Blocks, Cuisenaire Rods, Geoboards, Counters, and much more.
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Complete Mathematics @lasalleed.bsky.social · 16/09/2026
Do you have a passion for maths and love sharing ideas? We're looking for workshop presenters for #MathsConf42 📍 Trinity Academy, Barnsley (S70 6FP) 📅 14th November 2026 Submit your workshop proposal by emailing Events@completemaths.com or complete the form here: completemaths.com/community
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Jonathan Robinson @mr-mathematics.bsky.social · 14/09/2026
I’m looking for my next Head of Maths role in the South East. Experienced Head of Maths, currently teaching, with a strong interest in curriculum development, and improving departmental consistency. I also run Mr Mathematics. If you know of a suitable opportunity, please get in touch.
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Big MathsJam @bigmathsjam.bsky.social · 10/09/2026
There’s only two months to go until this year’s Big MathsJam UK Gathering - if you haven’t already booked your tickets, head to mathsjam.com/gatheri... to find out all the details and grab your spot. Previous events have fully sold out, so make sure you don’t miss your chance!
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Piccalilli @piccalil.li · 11/09/2026
Just a quick reminder, we're offering a huge 35% discount on all courses if you use the coupon code PRICEFALL at checkout. piccalil.li/courses/
Autumn sale, September 8th until September 22nd. 

35% off all courses. 

Save over £80 with code “PRICEFALL”
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mrmunro.bsky.social @mrmunro.bsky.social · 02/09/2026
This year we are launching A Level statistics. Reaching out to anyone who has delivered this already? #AlevelStats Appreciate a retweet to reach more people 🙏🏽
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Tom Button @tombutton.bsky.social · 11/09/2026
Any other #ALevelMaths teachers also teach #ALevelStats?
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Alex J-W @alexjw.bsky.social · 10/09/2026
teaching-vacancies.service.gov.uk/jobs/teacher... anyone fancy a nice part time job in south man with me!
teaching-vacancies.service.gov.uk
Teacher of Mathematics - Parrs Wood High School
Teacher of Mathematics job from Parrs Wood High School. Apply by 14 Sep 2026.
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Jonathan Hall @studymaths.bsky.social · 10/09/2026
This is one of my favourite things I’ve made. Here’s the link if you’ve not seen it before. mathsbot.com/puzzles/prim...
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jrlarsen @room51.co.uk · 09/09/2026
Sub 2000
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Web Awesome @webawesome.com · 09/09/2026
Web Awesome styles your words, not just your components. Wrap your blog post, docs, or changelog in one class & every heading, list, blockquote, & code block lands on your theme's scale. A 3xs–5xl type scale handles the rest, + CSS @scope stops leaks. blog.fontawesome.com/web-awesome-...
blog.fontawesome.com
Your Design System Should Style Your Words, Too
News and information from Font Awesome – the internet’s favorite icon set; mixed with musings and nerdery from the team behind it.
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Jo Morgan @mathsjem.bsky.social · 09/09/2026
New podcast episode! This is from our new series of podcasts where Craig Barton and I discuss some of the issues that have been raised on hodspace.com. podcast.mrbartonmaths.com/230-hod-spac...
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Jonathan Hall @studymaths.bsky.social · 09/09/2026
First #MathsToday of the new term! Y10 were decomposing algebraic expressions into their individual factors using Prime Factor Tiles. This then led into multiplying and dividing expressions.
Prime Factor Tiles showing the algebraic decomposition of 30x²y³.
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Jon Fant @fantasticmaths.bsky.social · 07/09/2026
A summary of some of #rED26 although there’s more to come. fantasticmaths.substack.com/p/nobody-imp...
fantasticmaths.substack.com
Nobody Improves in One Saturday
My third researchED National, my first as a speaker, and what actually sticks afterwards?
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Alison Kiddle @alisonkiddle.bsky.social · 07/09/2026
There are some lovely activities in here that could be used for getting to know new classes, or for that maths club your senior leadership has been on at you to start...
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Complete Mathematics @lasalleed.bsky.social · 07/09/2026
🚨 Double announcement! 🚨 The next two MC events are confirmed: 🔥 MC42📍 Trinity Academy, Barnsley 📅 14 November 2026 🔥 MC43 📍 Penrice Academy, St Austell 📅 20 March 2027 🎟️ Tickets for MC42 are on sale now, with MC43 tickets coming soon. completemaths.com/community
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Nathan Day @nathanday.bsky.social · 07/09/2026
And Year 13 did some complex numbers questions from @tlmaths.bsky.social and @danihosford.bsky.social's excellent Core Pure Part 2 book: sites.google.com/view/tlmaths... It has really lovely questions, and nicely brings in ideas from other topics in clearly labelled questions. I highly recommend.
sites.google.com
TLMaths - A-Level Further Maths Core Pure Part 2 Textbook
Home > A-Level Further Maths Core Pure Part 2 Textbook
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Atul Rana @atulrana.bsky.social · 07/09/2026
My reflections from #MathsConf41 and a great day of CPD and friendships. www.atulranatutors.co.uk/mathsconf41-...
atulranatutors.co.uk
MathsConf41 Liverpool - With a Little Help From My Maths Friends
My MathsConf41 Liverpool review: five workshops on GCSE maths, connected revision, probability, mathematical surprises, tutoring and AI.
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Gareth Shadick @garethshadick.bsky.social · 05/09/2026
There was lots of food for thought in this session from @mrmattock.bsky.social at #MathsConf41 : probability as a measure; introducing theoretical and experimental probability alongside each other; connecting different representations
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Liza Johns @ljohns6.bsky.social · 05/09/2026
Thank you, Liverpool, for a fantastic #MathsConf41! 🌟 What a brilliant day talking all things maths and sharing practical ideas for revision. Read my full reflection below 👇
linkedin.com
#mathsconf41 #mathsconf43 #mathseducation #mathsteachers #gcsemaths #professionaldevelopment | Liza Johns
Thank you, Liverpool, for a fantastic #MathsConf41 and thank you to everyone who attended my workshop, Revision Reimagined: Core Concepts, Connected Maths, Better Outcomes. I had such a fantastic da...
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Jo Austen @joausten.bsky.social · 04/09/2026
⭐⭐ 4️⃣ ➕⭐⭐ 4+ in GCSE maths is a big deal! However, the tallest bar is the 153,255 who got a Grade 3 this year. Can you help me find them? 💻 9x free webinars, every Monday at 5pm 👨‍💻 Small online lessons (max 6 students) @ £15 a session More info & sign up: grade3to4bynovember.carrd.co
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Jo Morgan @mathsjem.bsky.social · 05/09/2026
We're approaching 400 members on hodspace.com which was only launched one month ago. People are using it to ask for advice, chat about maths teaching, share resources etc. I’m loving it! If you join in September you get four whole weeks for free!
Advert for hodspace.com
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Liza Johns @ljohns6.bsky.social · 05/09/2026
All set for #MathsConf41! ➗📐 I’m so excited for today and looking forward to attending some brilliant workshops, meeting fellow maths enthusiasts and gathering lots of new ideas. Notebook ready. Maths geek mode fully activated! 🤓😂 Time to get our maths on! 🧮 #MathsCPD #ProfessionalDevelopment
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ppk 🇪🇺 @quirksmode.org · 02/09/2026
Fifteen years ago I helped popularise the meta viewport width=device-width,initial-scale=1. Today I found out the second bit is no longer necessary. A retrospective. quirksmode.org/quirksblog/2...
quirksmode.org
initial-scale no longer needed
Fifteen years ago I helped popularise the meta viewport width=device-width,initial-scale=1. Today I found out the second bit is no longer necessary. A retrospective.
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Vale @vale.rocks · 02/09/2026
Respected friends and acquaintances, initial-scale is dead! We are freed of its tyranny. You no longer need to include it in your HTML head. It is an obsolete part of your head's meta viewport declaration. The details: vale.rocks/micros/20260... #WebDev #HTML
vale.rocks
You Don't Need Initial-Scale In Your HTML - 2 Sept 2026 13:50 UTC
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Complete Mathematics @lasalleed.bsky.social · 02/09/2026
A big thank you to our Events Innovation Partner, AQA Maths, and to all our exhibitors: Cambridge OCR, English Bridge Education and Development, Maths Advance, MathsWatch, MEI Maths, ScienceStudio, Seneca, Pearson, Third Space Learning, and White Rose Education. 🎟️ completemaths.com/community
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Nathan Day @nathanday.bsky.social · 31/08/2026
*New* Mathematician of the Week Posters Here's something I've been working on over the summer. A growing set of posters of mathematicians doing cool things with maths. Each comes in black/white or colour, with a quote and a link to read more. Check them out at: interwovenmaths.com/mathematicians
Collage of 25 posters of mathematicians.Screenshot of week 1, showing a poster, a quote and a link.Screenshot of week 14, showing a poster, a quote and a link.Screenshot of week 12, showing a poster, a quote and a link.
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Liza Johns @ljohns6.bsky.social · 31/08/2026
My #MathsConf41 workshop choices: 1 - Greg Thomas & Tom Brown 2 - Liza Johns (Tis me!! 😁) 3 - Joanne Stanistreet 4 - Jack Campbell 5 - Paul Coffey & Natalie Thompson Join me with @lasalleed.bsky.social, get your ticket here: completemaths.com/community/mathsconf41 What's yours?
completemaths.com
Complete Mathematics - MathsConf41
Mathematics tuition for primary, secondary and FE. Home schooling. Math improvement.
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Michelle @michelleroy78.bsky.social · 30/08/2026
A much-needed break from anything serious. 🥰
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Official Commodore® @commodoreofficial.bsky.social · 30/08/2026
Commodile #gamescom2026 #retrogaming
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Complete Mathematics @lasalleed.bsky.social · 30/08/2026
6 days. Hundreds of maths teachers. Unlimited inspiration. #MathsConf41 is just around the corner! From expert sessions to networking, we’ve got everything you need to level up your classroom game. Grab your ticket before the doors close! 🎟️ completemaths.com/community
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Peter Mattock FCCT CMgr FCMI @mrmattock.bsky.social · 27/08/2026
My #MathsConf41 workshop choices: 1 - Greg Thomas & Tom Brown 2 - Vicky Wood 3 - Peter Mattock 4 - Zoe Griffiths 5 - Paul Coffey & Natalie Thompson Join me with @lasalleed.bsky.social, get your ticket here: completemaths.com/community/mathsconf41
completemaths.com
Complete Mathematics - MathsConf41
Mathematics tuition for primary, secondary and FE. Home schooling. Math improvement.
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Andy Clarke @allthatmalarkey.bsky.social · 27/08/2026
I love making podcasts, my own, and talking with others. Of all the podcasts I’ve recorded, this is the one I am most proud of. It’s deeply personal and profound. Thanks @bradfrost.com share.transistor.fm/s/1c6e0740
share.transistor.fm
Nostalgia, Legacy, and Finding What’s Next with Andy Clarke | Wake Up Excited!
Andy Clarke shares what excites him lately, sparking memories of his early photography career and frequent trips to Schaffhausen. His pivot from art school and darkroom work into technical sales, and ...
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Official Commodore® @commodoreofficial.bsky.social · 25/08/2026
In Night City, every connection comes with a price. Every file. Every function. Every moment watched. Pre-order yours before the corpos notice: commodore.net/store/commod... #gamescom2026 #openingnightlive @cyberpunk.net
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Den Odell @denodell.bsky.social · 24/08/2026
Deal of the Day August 24: Save 45% on my book Fast by Default and other selected titles @manning.com : hubs.la/Q03-d27Y0
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Complete Mathematics @lasalleed.bsky.social · 22/08/2026
🚨 #MathsConf41 is LIVE! 🚨 The full workshop programme is now available, and workshop selection is OPEN! 🎯 Explore the sessions, choose your favourites and secure your place before they fill up. 👉 completemaths.com/community #MathsConf41
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Stuart Robson @sturobson.com · 21/08/2026
🎉 new article 🎉 Web Components, Design Tokens, and CSS @layer. in another episode of some recent blog-and-response'ing Can we get there?? … almost(-ish). www.alwaystwisted.com/articles/desi…
alwaystwisted.com
Design Tokens, Web Components, and CSS @layer
Use design token metadata to generate :host defaults and :defined overrides for Shadow DOM web components.
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Bruce Lawson @brucel.bsky.social · 21/08/2026
Mastermind specialist subject: Transport for London moquettes (the patterned upholstery seen on London transport). And she's wearing a moquette-themed pullover. Hero!
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Jess Rose @jesslynnrose.bsky.social · 21/08/2026
Ok Bluesky, what impossibly specific topic are you like this about? 👀
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Ollie Williams @ollie-williams.bsky.social · 21/08/2026
olliewilliams.xyz/blog/opaquer...
olliewilliams.xyz
Highlighting a range of text inside an input or textarea
Using OpaqueRange and the Custom Highlight API
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Mat “Wilto” Marquis @wil.to · 20/08/2026
Been dragging my feet on posting this one outside Da JS4E Subscriber Z0ne* for fear of oversharing, but: I’m feeling really beat-down lately. Not to make it weird or anything, but the reason my laptop is still open and my hands are still moving is you. wil.to/js4e/newslet... *Nobody calls it that.
wil.to
Despite Everything
A behind-the-scenes look at my work on JavaScript for Everyone, from Piccalil.li.
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Mark McCourt @markmccourt.bsky.social · 17/08/2026
NEW BLOG: On Suicide www.emaths.co.uk/blog/persona...
Minimalist cream banner with the title “On Suicide” in dark serif text beside a delicate, muted botanical stem.
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Complete Mathematics @lasalleed.bsky.social · 18/08/2026
💻 Get started with Desmos Notebooks! Explore the new platform, see a notebook built live, and create your own in this hands-on workshop. Leave with practical experience and ideas ready for the classroom. 🎟️ completemaths.com/community #MathsConf41
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Sam Hartburn @samhartburn.bsky.social · 17/08/2026
Don't miss our one and only gig this year! Cracking new maths songs, old favourites, a set from the wonderful Helen Arney, and the chance to explore some of the MathsWorld exhibits! Monday 21st September at MathsWorld, London. Tickets at mathsworld.com/events/Pseud...
Poster with a photo of the band members of Pseudorandom Ensemble and a photo of Helen Arney. With the text MathsWorld Lates: London. The Pseudorandom Ensemble, featuring Colin Beveridge, Sam Holloway, Sam Hartburn and Gavan Fantom.

Monday 21st September

Music 18:45
Museum open 18:15-21:00
£8 per person
£5 annual pass holders

A musical journey through the highs, lows and medians of being a mathematician, with detours into the worlds of pentagonal tilings, squircles, square packing and more. Expect maths! Expect music! Expect significant amounts of exposition between the songs to make sure everyone's up to speed! With special guest Helen Arney - geek songstress, musical comedian and one third of Festival of the Spoken Nerd.

For more info or to book, head to www.mathsworld.com/events
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