Math Links for Week Ending Aug. 27th, 2021

Featured Links

If you haven't looked at the dynamic stuff that @TimBrzezinski does with both @Geogebra and @Desmos then you are missing out. Put him on your follow list. Here is some stuff with radian measure. 
Curriculum Tags: MHF4U
https://twitter.com/TimBrzezinski/status/1430917072003821570
https://twitter.com/TimBrzezinski/status/1430842069342380032

Constructing angles given radian measure: Quick formative assessment with conceptual insight: https://t.co/sLZLjaLSMF & https://t.co/EFWuzMSOQ2 @geogebra #MTBoS #ITeachMath #math #geometry pic.twitter.com/lnrRB1dPK9

— Tim Brzezinski (@TimBrzezinski) August 26, 2021

Coffee ☕️ + @Desmos 🙂 this AM = https://t.co/gPEoUdMagc. Also added to https://t.co/14l4ROTQpn. @AlgebraDesmos @madewithDesmos #algebra #trig #math #mathchat pic.twitter.com/YvXfcypruk

— Tim Brzezinski (@TimBrzezinski) August 26, 2021

Resource Links
Do you want some resources for the new Ontario Gr9 Math course. This resource might be the thing for you. So much to choose from from many strands and many modes.

Curriculum Tags: MTH1W

https://docs.google.com/document/d/1OEYPyvOhatVwzFsFIWygVH3nYzia8uCU8IDHJHGBSbo/edit

Proud to share the #MTH1W resources from @HPEschools summer writing project. Includes:

** SPIRALLED PLAN
** DESMOS ACTIVITIES
** CODING ACTIVITIES
** FINANCIAL LITERACY UNIT

HUGE thanks to the 20 secondary teachers who put this together! #onted #MTBoShttps://t.co/amXUr9EhaW

— Rob Garden (@garden_rob) August 23, 2021

Article Links

An older article about logarithms from @StevenStrogatz but still good 
Curriculum Tags: MHF4U
https://opinionator.blogs.nytimes.com/2010/03/28/power-tools/

'Logarithms? You Understood Those?' For my companion article to this little joke, and for more about logarithms and other functions, see: https://t.co/y8F8mMrivQ https://t.co/hIqKSjFKkw

— Steven Strogatz (@stevenstrogatz) August 21, 2021

Video Links

I love a good infinite proof video. I think students of all ages should see something like this
Curriculum Tags: All
https://twitter.com/howie_hua/status/1431045772972150784

New TikTok video: Proving there are an infinite amount of prime numbers pic.twitter.com/AZPYsUjvnk

— Howie Hua (@howie_hua) August 27, 2021

Image Links

Are you doing any sort of number pattern work with numbers? Then this is a neat question.
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/howie_hua/status/1430722198201769985

Our first mathematical task is using patterns to solve problems. This is my favorite pattern to talk about. Where will 1,000 be in this grid?

(Source: Tony Cotton's "Teaching for Mathematical Understanding") pic.twitter.com/zqrooAm4Ii

— Howie Hua (@howie_hua) August 26, 2021

Math Links for Week Ending Aug. 20th, 2021

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Lots of stuff this week to support the newly released Grade 9 Math curriculum. Firstly a new (to me) resource BHNMath that has all sorts of resources for Ontario secondary school students, parents and teachers. For example, there are a lot of references to story telling in the new grade 9 curriculum and so here is a resource for topic ideas for those expectations. Thanks to @RobinMath3 for pointing this resource out. 
Curriculum Tags:All
https://www.bhnmath.ca/teachers/courses/mth1w1/tell-a-story/

I've begun creating a list of some "Tell a Story" topic ideas for #MTH1W. I'll keep adding topics as I think of them. Suggestions are very welcome! The more cultures/contexts, the better!https://t.co/161ZQOPOtn pic.twitter.com/gEmnXIOIci

— Adam Gesjorskyj (@AGesjorskyj) August 18, 2021

Resource Links

It seems that @HTheijsmeijer has been working hard coming up with resources for specific expectations for the new Grade 9 course connecting to the cultural context and she's sharing them and asking for feedback to make them better. Check them out here
Curriculum Tags: MTH1W
Golden Ratio: https://docs.google.com/document/d/1WoAlTL-c2UZmAV_wID1S4e8oP4N5rYkNiZOKoMULh24/edit
Right Angled Triangles: https://docs.google.com/document/d/1o-XrQIBcwlSpBUORoB-AtEKy7LSGljv36wrdH6TO6vg/edit
Number Systems: https://docs.google.com/document/d/1Ja6uzkfJFhb8N34BdA0YYn_k1kHiFWLFmo7Eh2Fgq9k/edit

Another teacher resource for #MTH1W - this time for the Golden Ratio in various cultures, which could fit well with B1.3 (use patterns and number relationships to explain density/infinity/limit...)

Again, suggestions/additions more than welcome!https://t.co/FReaIEgEDW

— Heather Theijsmeijer (@HTheijsmeijer) August 19, 2021

Put this together this afternoon as a #MTH1W resource. Suggestions/additions welcome!

Right triangle side relationship resources (alternative backgrounds to the "Pythagorean Theorem"):https://t.co/8b494MCoof

— Heather Theijsmeijer (@HTheijsmeijer) August 18, 2021

One more #MTH1W resource, this one for B1.1 (...number concept to tell a story about its development and use in a specific culture...).

I definitely need help filling this one out - suggestions/additions welcome!

Counting Systems from Around the World:https://t.co/JwEhdfPLS4

— Heather Theijsmeijer (@HTheijsmeijer) August 20, 2021

I've mentioned this coding resource specific to Grade 9 Math before. Now all the weekly challenges are there. So check them out. 
Curriculum Tags: MTH1W
https://sites.google.com/apps.hpedsb.on.ca/codingchallenge/home

The 8th (and final) #mth1wCodingChallenge is posted. This week's focus is creating animations in Scratch to tell stories. Great for the SEL and story telling expectations.

Thanks to all those who joined. All the best with #mth1w!
https://t.co/4a6JMoHdOf

— Dave Lanovaz (@DaveLanovaz) August 16, 2021

Here's a great @OpenMiddle interactive for sum of angles in a triangle
Curriculum Tags: Gr8, MTH1W

https://twitter.com/TimBrzezinski/status/1427639764119924742

Wondering if this @openmiddle problem by @aa_henderson can help Ss discover the relationship FIRST vs. being a problem to work through afterwards. 🤔 With 192 unique solutions, I’m hoping “yes”. 🙂 https://t.co/N6KQgOSR0u @geogebra @robertkaplinsky #MTBoS #ITeachMath #mathchat pic.twitter.com/eUyHhOz4Z5

— Tim Brzezinski (@TimBrzezinski) August 17, 2021

And speaking of @OpenMiddle, here's another for graphing. 
Curriculum Tags: Gr7, Gr8

https://twitter.com/robertkaplinsky/status/1428147213247684609

Looking to challenge your students who are learning about the coordinate plane? Try this @openmiddle problem with them. https://t.co/DF2YVKmcue #iteachmath pic.twitter.com/T22Z2Na8hy

— Robert Kaplinsky (@robertkaplinsky) August 19, 2021

And @NatBanting says that creating interactive resources using @Mathigon isn't terrible. Check this one out for beginning probability. 
Curriculum Tags: Gr7, Gr8
https://mathigon.org/task/ace-in-the-hole

This Summer I tried my hand at building a @MathigonOrg task for their library.https://t.co/8YxoTG14WW

Builder was quick to pick up and @davidporas was there when I needed it!#MTBoS #iteachmath

— Nat Banting (@NatBanting) August 16, 2021

Video/Audio Links

And some more for the new Grade 9 math curriculum it's @Jason_To talking about destreaming and anti-racism.
Curriculum Tags: MTH1W
https://www.cbc.ca/listen/live-radio/1-100-ottawa-morning/clip/15861138-teachers-grade-9-math-curriculum

Thanks to @OttawaMorning and Jodie Hudgin for the bright-and-early convo about destreaming and anti-racism in math learning.

Here's the recording for those that were still in bed: https://t.co/d4Yj9EveE0 https://t.co/lcqDYNaMnN

— Jason To (@Jason_To) August 18, 2021

Need a visual on the sum of a series?  How about this one from @TedG on sums of powers of 3s?
Curriculum Tags: MCR3U
https://www.youtube.com/watch?v=9IAm75UY2U8

And it seems that @Howie_Hua continues to give us great short videos on math topics. This time it's the Birthday Problem. 
Curriculum Tags: MDM4U
https://twitter.com/howie_hua/status/1427798204305743876

New TikTok video: The Birthday Paradox pic.twitter.com/kQcnaGYFRL

— Howie Hua (@howie_hua) August 18, 2021

Image Links

Got some kids who need a mental challenge? Ask them to explain this one dealing with imaginary numbers and everyone's favourite math theorem
Curriculum Tags: MCR3U, MHF4U
https://twitter.com/pickover/status/1428504250867494913

Mathematics.

A Pythagorean triangle visits us from the Twilight Zone, and we shiver in ecstasy. (a² + b² = c²) pic.twitter.com/6Yf5hykeiY

— Cliff Pickover (@pickover) August 19, 2021

Math Links for Week Ending Aug. 13th, 2021

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I have mentioned GraspableMath before but it's come up in my feed from a few different places so I thought I would mention it again. If it's new to you then check it out, you'll love this dynamic algebra system. If you already know about it then you know what I'm talking about. 
Curriculum Tags: All
https://graspablemath.com/

If you've used Graspable Math for a bit, you probably agree that working with signs could get quite annoying. But no longer! We're so excited to finally introduce dragging of signs 🎉 pic.twitter.com/J1ILccmHGA

— Graspable Math (@GraspableMath) August 12, 2021

Resource Links

Though I think this was meant for math teacher, I think many of the suggestions here could be for any subject area. New or old, I think any teacher could make use of some of these suggestions. 
Curriculum Tags: All
https://www.fawnnguyen.com/teach/dear-new-teachers

Good morning! I wrote a new post: Dear New Teachers https://t.co/VjixKqXhpE

— Fawn Nguyen (@fawnpnguyen) August 8, 2021

Video Links

Nice, @3Blue1Brown interviews @StevenStrogatz
Curriculum Tags:All
https://www.youtube.com/watch?v=SUMLKweFAYk

Some great dynamic geometry animations here:
Curriculum Tags: All
https://twitter.com/MagicPi2/status/1424063460166537223

Area of a Triangle#mtbos #iteachmath #math #Maths pic.twitter.com/iGAgHKh021

— Idan Tal (@MagicPi2) August 7, 2021

https://twitter.com/panlepan/status/1425014879501574161

You might like this hinged dissection I made for the 3:4 pic.twitter.com/APXwYm23FU

— Vincent Pantal🍩ni (@panlepan) August 10, 2021

Image Links

It's the last week of #MathPhoto21. So have fun
Curriculum Tags: All
https://twitter.com/DianeDevine18/status/1425811428066406400

Week 10 starts today with a theme of Math at Play(#mathplay). Thanks, Erik, for asking me to host! #Mathphoto21 pic.twitter.com/UMgNlv4oDN

— Diane Devine (@DianeDevine18) August 12, 2021

    

Math Links for Week Ending Aug. 6th, 2021

Featured Links

Last week I shared a video where @DavidPoras hinted at some new 3D geometry tools and now @Mathigon has released them. They are pretty easy to use (here I made an incomplete and complete net and it was easy)
Curriculum Tags: All
https://mathigon.org/polypad/

Big news: Polypad now supports 3D geometry! 🎉⚽️🎁 Use one of our built-in solids, or create your own net using polygon tiles. Then click “fold” and watch the magic happen… pic.twitter.com/lMeBZbvGSo

— Mathigon (@MathigonOrg) August 2, 2021

Resource Links

I always like hands on activities and especially if it's for statistics. 
Curriculum Tags: MTH1W, MDM4U
https://mathequalslove.net/candy-grab-lab-for-linear-regression/

This Candy Grab Lab is my favorite way to introduce linear regression to my students. Students use their regression equation to determine how many starbursts that various school staff members should be able to pick up. #mtbos #iteachmath #statchathttps://t.co/ikYv9EhFfY pic.twitter.com/GXYjemFddO

— Sarah Carter (@mathequalslove) July 30, 2021

@MathEqualsLove has really been on fire lately with new blog posts
Curriculum Tags: All
https://mathequalslove.net/five-arrows-puzzle/

I can't wait to try this five arrows puzzle with students next week! https://t.co/VhL3hIkbEf #mtbos #iteachmath #puzzlingclassroom pic.twitter.com/OtfN2zgSHZ

— Sarah Carter (@mathequalslove) August 5, 2021

And although this is an old post from her, this is a fun matching activity for your kids
Curriculum Tags: All

https://mathequalslove.net/math-joke-of-the-week-posters/

Oh my goodness. How cute is this bulletin board that @tracy_zalud made with my math joke of the week posters?!?

I love how the answers to the jokes are off the the side in a random order. Brilliant! https://t.co/yD5w2ZmkCP #mtbos #iteachmath pic.twitter.com/emqjxt4Ufw

— Sarah Carter (@mathequalslove) August 6, 2021

Even if you don't directly participate in the #MatchMyCL challenge, you may still want to follow the hashtag to get some good beginning of the year goodies. 
Curriculum Tags: All
https://twitter.com/mrchowmath/status/1422590841286107136

👋love @Desmos ? This #MatchMyCL is for everyone!

It's the start of a new school year! This month, to honor your time and still get some resources shared around, let's share something that's already been created. Share a beginning-of-the-year activity that you enjoy. pic.twitter.com/UnZbiHU03p

— Jay Chow (@mrchowmath) August 3, 2021

Video Links

Some topical probability discussion here
Curriculum Tags: MDM4U
https://twitter.com/howie_hua/status/1421502809862664197

New TikTok video: Doing my part in helping people understand the difference between P(vacc|infected) and P(infected|vacc) pic.twitter.com/WpOTQk87WB

— Howie Hua (@howie_hua) July 31, 2021

Image Links

The second to last week for #MathPhoto21 has the theme of #Compliments
Curriculum Tags: All
https://twitter.com/maths_kath/status/1423226076856082434

#mathphoto21 The theme for Week 9 - which I am so happy to host - is #complement pic.twitter.com/Rh9bJiuSD6

— Dr Katherine Seaton (@maths_kath) August 5, 2021  

Math Links for Week Ending Jul. 30th, 2022

Featured Links

If this wasn't already the case when we started the year last year (because of our end of the previous year lockdown), it's probably more the case now. That is, the idea with @DDMeyer's post on advice on how to handle the fact that students may be coming into our classes this year on the deficient side. So I appreciate the analogy to "Previously on..." TV shows. 
Curriculum Tags: All
https://danmeyer.substack.com/p/surviving-this-next-school-year-with

I'm convinced teachers will have a much easier upcoming year if they understand math as a good TV show and understand students as having missed a couple of episodes. More here. 👇 https://t.co/8Dq7IC7nbR pic.twitter.com/utwNAhvzqr

— Dan Meyer (@ddmeyer) July 29, 2021

Resource Links

Just a reminder that there are now 15 pentagons that will tile the plane. And check out the reminder from @DavidPoras in the comments with a reminder that they all exist in Polypad
Curriculum Tags: Gr7, Gr8
https://twitter.com/panlepan/status/1420846181081563136

Currently, and forever it's 15, not 14. Thanks to M. RAO in 2017.https://t.co/VaNSgnVcQQ pic.twitter.com/vV6lvH8C9o

— Vincent Pantal🍩ni (@panlepan) July 29, 2021

Here's a neat little hack for the Desmos Graphing calculator for scientific notation
Curriculum tags: All
https://twitter.com/fnoschese/status/1418968332884193289

Although Desmos doesn't accept E notation as a shortcut for scientific notation, I found a silly workaround by defining a function E(x)=10^x. #iteachphysics pic.twitter.com/D7GGWnuEEo

— Frank Noschese (@fnoschese) July 24, 2021

Some hands on activities for coterminal angles from @MathEqualsLove
Curriculum Tags: MCR3U, MHF4U

https://mathequalslove.net/odd-one-out-coterminal-angles-activity/

Odd One Out Coterminal Angles Activity https://t.co/YMMY77rrl7 #mtbos #iteachmath #iteachtrig #precalchat #precalcchat pic.twitter.com/4XLuDVXrfn

— Sarah Carter (@mathequalslove) July 28, 2021

Article Links

Mathematicians, they are everywhere. Even winning gold at the Olympics
Curriculum Tags: All
https://www.cyclingnews.com/features/anna-kiesenhofer-mathematician-amateur-cyclist-olympic-champion/

Video Links

I love all the geometry that can be done on Polypad. In this webinar from @DavidPoras, you can see how to use them including a preview of some of the new, very cool, 3D features at around the 32 minute mark. So excited about the dynamic 3D nets.
Curriculum Tags: All
https://www.youtube.com/watch?v=rQKK18qa1OI

There is definitely some math happening in and around the Olympics
Curriculum Tags: All
https://twitter.com/panlepan/status/1418988744544329729

The hidden geometry behind the @Tokyo2020 logo for the paralympics. Start with a regular dodecagon...@geogebra applet and #MathGIF : https://t.co/OJ3Wjbc4UQ pic.twitter.com/kX0rISBiKK

— Vincent Pantal🍩ni (@panlepan) July 24, 2021

Image Links

This week for #MathPhoto21 it's #conics. Take your pictures and post them with the proper hashtags
Curriculum Tags: All
https://twitter.com/MrsTangmath/status/1420712020748513284

New week, new topic for #mathphoto21. Looking for examples of conic sections as they exist outside of textbooks and weirdly stacked ancient Greek cones. pic.twitter.com/sgi3sSMmUQ

— Mrs Tang (@MrsTangmath) July 29, 2021

I think this would be good for data management (maybe about making a better representation) but I also think it would be good for talking about orders of magnitude
Curriculum Tags: Gr7, Gr8, MDM4U
https://twitter.com/simongerman600/status/1420828985978667017

Animals That Kill The Most Humans. Source: https://t.co/Z2IiEmYD5C pic.twitter.com/k5FEuY3gdV

— Simon Kuestenmacher (@simongerman600) July 29, 2021

I think I would like to have the actual data for this and have kids play with shifting things around. 
Curriculum Tags: Gr7, Gr8, MDM4U
https://twitter.com/MarkChubb3/status/1419002380696309764

Olympic Records by sport and age:

What do you notice?
What do you wonder?#PairedVisuals #mtbos #Olympics #Olympics2021 pic.twitter.com/leoSlI8LNI

— Mark Chubb (@MarkChubb3) July 24, 2021

Of course there is data in Legos
Curriculum Tags: Gr7, Gr8, MDM4U    
https://www.reddit.com/r/dataisbeautiful/comments/oqhkv2/oc_distribution_of_lego_colours/

[OC] Distribution of Lego colours https://t.co/wLUkNNNpLW #dataviz

— r/DataIsBeautiful (@DataIsBeautiful) July 24, 2021

Math Links for Week Ending Jul. 23rd, 2021

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Last week we found out that there was some language removed from the new Grade 9 Ontario Math curriculum about being culturally responsive and dealing with equity. Check out last week's post for more. This week, here are the responses from the OAME and the OMCA. And again, if you are not OK with this, contact your local MPP. 
Curriculum Tags: All 
https://twitter.com/OAMEcounts/status/1417486089321914368
https://twitter.com/OMCAmath/status/1416431553522114563

Regarding the recent changes to the Grade 9 Math Curriculum pic.twitter.com/PSBPYYF37l

— OAME/AOEM (@OAMEcounts) July 20, 2021

Please read this statement from the OMCA executive regarding the unilaterally imposed changes upon the new Grade 9 de-streamed Math course. pic.twitter.com/0YnNofEoks

— OMCA (@OMCAmath) July 17, 2021

Resource Links

I have said it many times that I am a fan of matching activities. This one comes from @MathEqualsLove, someone who is no stranger to matching activities. In this case it's a twist on a worksheet with complex exponent simplification questions. Here students have 20 expressions to simplify to match up with one of 4 simplified expressions. Read on for more info and the downloads. 
Curriculum Tags: MTH1W, MPM2D
https://mathequalslove.net/exponent-rules-match-up-activity/


Speaking of equity, the folks at Desmos are very committed to their equity principals. And if you have ever use their activities in Anonymize mode, you know that students' then get renamed as a current or historical mathematician. Well they have just updated their list to be more inclusive than it already was and you can read about their thought process (and see the entire list) here.
Curriculum Tags: All

https://blog.desmos.com/articles/new-mathematicians-list/

As many of us will be transitioning from online learning back to face to face, @MrValencia24 has some ideas of how he will continue to use what he's learned online in his face to face classes. 
Curriculum Tags:All

https://blog.savvas.com/4-practices-math-teachers-should-keep-from-hybrid-learning/

As we look forward to more in-person learning in the fall, math teacher Libardo Valencia shares practices from hybrid learning he plans to keep up. Read about it on the blog: https://t.co/CxP1GSNLv9 #edtech #iteachmath #mathchat

— Savvas Learning (@SavvasLearning) July 22, 2021

Article Links

A new study exploring cognitive ability and math anxiety
Curriculum Tags: All
https://twitter.com/maanow/status/1417635587490828292

Have you ever experienced math anxiety? Check out this article on a new psychological study that looks at the phenomenon and uncovers its possible cognitive precursors: https://t.co/VW1vhVsJcP

— MAA (@maanow) July 21, 2021

Video Links

Currently there is some concern about breakthrough cases of C19 but I like this explainer in this thread of Tweets that shows that comparing the right things is important. Be sure to look at the whole thread
Curriculum Tags: MDM4U
https://twitter.com/LucyStats/status/1417276625146851340

Denominators matter, a thread 🧵👇 https://t.co/DU0Tn3hf1Y pic.twitter.com/01sqEUzUfV

— Lucy D’Agostino McGowan (@LucyStats) July 20, 2021

You can count on @JamesTanton to give us examples of beautiful math. In this video from 5 years ago, he shows us how making things visual can make things more visual with this problem that starts with an array of dots. 
Curriculum Tags: All
https://www.youtube.com/watch?v=80mINNY_zps

They keep adding more features to Polypad. This time, here's some info on creating systems of equations with balance beams.
Curriculum Tags: MPM2D
https://twitter.com/davidporas/status/1416391248462729218

With new "y" algebra tiles on Polypad at @MathigonOrg, Ts can easily create systems of equations for Ss to explore. Here's one approach to a solution. The Polypad is at this link: https://t.co/lR5tX0Gzym. See the next Tweet for how to create a system like this. #iteachmath #mtbos pic.twitter.com/oPnrIpQaNT

— David Poras (@davidporas) July 17, 2021

Dynamic Tessellation.
Curriculum Tags: Gr7
https://twitter.com/nicolasdnl/status/1416123666585239552

🔺➿ pic.twitter.com/WWn3KeANMd

— Nicolas Daniel (@nicolasdnl) July 16, 2021

Some deep thinking here about Godel's Incompleteness Theorem
Curriculum Tags: All

https://www.youtube.com/watch?v=I4pQbo5MQOs

Image Links

My personal favourite would be za-BO-ba fak-TOH-ah
Curriculum Tags:All
https://xkcd.com/2492/

#Sportsmath is the latest theme for #MathPhoto21
Curriculum Tags:All
https://twitter.com/mrscoxey/status/1418321103257100289

I am hosting #MathPhoto21 this week in honor of the Olympics. Lets’s see what you got! Tweet a photo of math in sports and #MathPhoto21 and #SportsMath pic.twitter.com/ILreitHiXr

— Jennifer Cox (@mrscoxey) July 22, 2021

Math Links for Week Ending Jul. 16th, 2021

Featured Links

If you follow Ontario math at all this week then you know that a bomb dropped in the area of equity and culturally responsive curriculum. That is, somehow, some of the language about these things that was in the front matter of the new grade 9 curriculum was quietly stripped out. However, people noticed. You can see exactly what the changes were in this Tweet and the associated comments (some of the comments further down the list as well). And even though this directly affects the current Gr 9 curriculum, this really affects all future curriculums. Let your local MPP know that you are not OK with this. 
Curriculum Tags: All
https://twitter.com/realJ_Mitchell/status/1415285871415373831

This entire section of the front matter to the grade nine math curriculum appears to have been removed.
Why?
Because some far right politicians got upset.
Why are they driving #OntEd curriculum?

YOU should care about this deletion, even if you don’t teach math. pic.twitter.com/xtZTMy6d9y

— Jamie Mitchell (@realJ_Mitchell) July 14, 2021

Looking at a side-by-side comparison of the original #OntEd destreamed math front matter and the edits that were released yesterday.
The edits are evil.
Dive into the thread if you are interested.

— Jamie Mitchell (@realJ_Mitchell) July 14, 2021

Resource Links

It's always nice to have a list of "go to" sites for resources. This list was curated by @JRappaport27. You an also see my list on this blog in the Best of the Web tab. 
Curriculum Tags: All
https://twitter.com/JRappaport27/status/1415702732124590081

I took a group of educators through a resource share this morning. All are linked and included in each slide is an overview and types of tasks found in each. Please share with anyone who might find this useful. #mtbos #iteachmath @fawnpnguyen @OAMElearns https://t.co/x2THNyjZhm pic.twitter.com/reU3esKlTH

— Jordan Rappaport (@JRappaport27) July 15, 2021

I like these two from @MathTechCoach on probability. This first one on randomness
Curriculum Tags: Gr7, Gr8, MDM4U
https://twitter.com/MathTechCoach/status/1413970469334798337

If you were unable to attend my session on Intuition, Simulation, Calculation: Teaching About Randomness, Variability, and Probability, here is a link to the recording.https://t.co/GMZEN9moV6
and the activity in Desmos https://t.co/8Ty6BRKKyq and GeoGebra https://t.co/MUWLsf0GCz

— Steve Phelps (@MathTechCoach) July 10, 2021

And I really like this one that is dealing with the idea of informal language with probability. It would be a great activity to use when just starting out.
Curriculum Tags: Gr7, Gr8, MDM4U
https://twitter.com/MathTechCoach/status/1414294401380241416

Thanks to the more than 100 folks who gave this a try.

Here is the teacher link for those interested: https://t.co/RSIkZA6ogl https://t.co/DYHOR5gD9k pic.twitter.com/Uaag3i5sf6

— Steve Phelps (@MathTechCoach) July 11, 2021

Opinion Links

And I would have been shocked if @MathGarden wouldn't have weighed in on this week's curriculum shenanigans. Given the title: "White Supremacist Ideology Influences Ontario Math Curriculum: Outcome is Inferior Mathematics." he clearly lets the people in power have it. Too bad they likely won't see this.
Curriculum Tags: All
https://sunilsingh-42118.medium.com/white-supremacist-ideology-influences-ontario-math-curriculum-outcome-is-inferior-mathematics-39ab900ed91d

Video Links

A nice video and interactive from @TimBrzezinski on the area of a Trapezoid
Curriculum Tags: Gr7, Gr8
https://twitter.com/TimBrzezinski/status/1413662639830482947

Following in the spirit of today’s Twitter convo inspired by @Sneffleupagus , here’s one for the area of a trapezoid: https://t.co/a2UqqyJclq @geogebra #MTBoS #ITeachMath #math #geometry #MathChat #geomchat pic.twitter.com/lhcXOgYWKu

— Tim Brzezinski (@TimBrzezinski) July 10, 2021

And this time one for the area of a triangle
Curriculum Tags: Gr7, Gr8
https://twitter.com/TimBrzezinski/status/1413307284369854464

Inspired by @Sneffleupagus : Another @geogebra resource through which Ss can explore areas of triangles: https://t.co/8rtitlwZyd #MTBoS #ITeachMath #geometry #math #maths pic.twitter.com/gllzYk4Ppg

— Tim Brzezinski (@TimBrzezinski) July 9, 2021

And here is another triangle area video and interactive
Curriculum Tags: Gr7, Gr8
https://twitter.com/dment37/status/1414124122687381506

Puzzle for the area of the triangle (acute or obtuse)@geogebra
https://t.co/s8R8SUoBzg#geogebra #MTBoS #ITeachMath #math #maths #mathgif #MathEd @PerHenrikChris1
@Bancoche #geogebrart pic.twitter.com/N3SyJdla8x

— Daniel Mentrard (@dment37) July 11, 2021

One of the expectations in the new Ontario Gr9 curriculum is about circle properties. So this video and interactive would be perfect. 
Curriculum Tags: MTH1W
https://twitter.com/TimBrzezinski/status/1415121531374538758

Enjoy this inscribed angle dance made in @Desmos!

Still have a couple of items to fix, but I’m happy with the way it works so far: https://t.co/COHT8E7814 @AlgebraDesmos @eluberoff #MTBoS #ITeachMath #math #geometry #MathChat pic.twitter.com/DePLEbuwjb

— Tim Brzezinski (@TimBrzezinski) July 14, 2021

Image Links

Given that we had an equity issue here in Ontario this week, the week 6 theme of #MathPhoto21 seems particularly on point
Curriculum Tags: All
https://twitter.com/hashtag/MathPhoto21?src=hashtag_click&f=live

Week 6 of #MathPhoto21 starts today with #EthnoMath. Thanks to @NadineMcSpadden @nikkilineham @EduBirkett for your help getting the prompt together😊 pic.twitter.com/lk5KFBdYch

— Jess Kyle (@jesannwa) July 15, 2021

A nice tessellation 
Curriculum Tags: Gr7
https://twitter.com/PolygoniaDsgns/status/1413496457164955654

Silver, purple, blue Metallic ink, 1mm. Designed with the #upcoming nested "triads" #free tool. #math #art #vector #design #pattern #comingsoon #svg #plotter #plottertwitter #gold #geometric #geometricart #geometricjuly #plotparty pic.twitter.com/BPlkvQl61o

— Polygonia Designs (@PolygoniaDsgns) July 9, 2021

Here's a nice problem dealing with the area of circles. 
Curriculum Tags: Gr7, Gr8
https://twitter.com/fermatslibrary/status/1413119456532959233

The bull's eye illusion. At first sight the inner disk in the center may appear larger in area than the outer ring, but the two have the same area: (5²−4²)π=3²π pic.twitter.com/so9pFfMIxE

— Fermat's Library (@fermatslibrary) July 8, 2021