Math Links for Week Ending Apr. 12th, 2019

Featured Links
Seriously, ths Desmos sketch is awesome. Click on the link in the Tweet if you want to see the inner workings
Curriculum Tags:MHF4U, MCV4U
https://twitter.com/SweenWSweens/status/1116443315749179397

Dandelion in the Breeze - Some Desmos graph art to celebrate Spring! https://t.co/MUl8uzZrrh #Mathart #desmos pic.twitter.com/eLhKYT0ZCq

— Sean Sweeney (@SweenWSweens) April 11, 2019

Resource Links
Looking for some resources on Rich Tasks? The @MathforLove has your back. He's got a lot of new resources on his new site on the importance of rich tasks. There are videos and free lessons. Take a look.
Curriculum Tags: All
https://mathspathway.com/media-library/

Opinion Links
A reminder that much of what we do in school does not relate to real life.
Curriculum Tags: All
https://twitter.com/robertkaplinsky/status/1115710613689257984

Here's my 3 sentence blog post:

1) Word problems do not exist in real life outside of school.

2) We teach students strategies for solving word problems like Three reads and CUBES.

3) Students will never use strategies like Three reads or CUBES in real life outside of school.

— Robert Kaplinsky (@robertkaplinsky) April 9, 2019

Article Links
I think this is a good article from @FiveThirtyEight about how they treat probabilities. A good read for any senior class.
Curriculum Tags: MDM4U
https://fivethirtyeight.com/features/when-we-say-70-percent-it-really-means-70-percent/?ex_cid=story-twitter

Video Links
A new one from @mathisvisual on visualizing solving one step equations. Follow the link to get the descriptions of all the steps.
Curriculum Tags: Gr7
http://mathisvisual.com/one-step-equations/

Last week I was in San Diego for NCTM and while there I got around the city riding these electric scooters that were literally sprinkled all over the city. Well @MrOrr_Geek and @mathletepearce made a little mini 3 act task dealing with them
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P
https://twitter.com/MrOrr_geek/status/1116386313345884160

While at #NCTMSD2019 @MathletePearce and I were obsessed with scooters from @lyft so we made a 3 Act Task. WDYN? WDYW? #mtbos #iTeachmath Some liberties were taken in creation @MatthewOldridge @MrsNewell22 @kathyhen_ @jocedage @drrajshah @gfletchy @davidpetro314 @robertkaplinsky pic.twitter.com/gXDK6jS0A0

— Jon Orr (@MrOrr_geek) April 11, 2019

Image Links
A super fun Venn Diagram for you
Curriculum Tags: All
https://twitter.com/simongerman600/status/1036368175305244675

Straight from reddit comes his hilarious Venn diagram. pic.twitter.com/PBCFM5J6Up

— Simon Kuestenmacher (@simongerman600) September 2, 2018

A new one from @GHSMaths
Curriculum Tags:All
https://twitter.com/GHSMaths/status/1115375666218831872

Three-armed spiral tessellations, based on the work of @RobFathauerArt (https://t.co/aGo85NisDS).https://t.co/UgXXcYn8X0#mathart pic.twitter.com/QbJOSNwwE2

— Martin Holtham (@GHSMaths) April 8, 2019

A couple of new ones from @MonaChalabi on the effect of skin colour on school suspensions
Curriculum Tags: MDM4U
https://www.instagram.com/p/BwCtC4znI6K/

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Do you know what colorism is? It’s the kitchen staff who are darker than the people out front waiting tables. It’s my family members hoping their kids will be light-skinned. And it’s here, in the US school system. Using data from The National Longitudinal Survey of Youth, US sociologists found a clear correlation between how dark a student’s skin is and the probability that they would be suspended. I found this part of the study important: “The disadvantage for darker-skinned young men derives from their link to a disfavored group (criminals) in an analogous way that the disadvantage for young women does (unfeminine and unattractive).” The researchers note that there’s a lot of discretion when it comes to how the school system punishes small offenses (like talking loudly) and darker skinned pupils suffer disproportionately. They note that future research should look at Hispanic communities too (I would add all poc communities to that list!) Source: Lance Hannon et al, Race and Social Problems, 2013 The Guardian has a special series all this week on colorism edited by Dream McClinton that I highly recommend!

A post shared by Mona Chalabi (@monachalabi) on Apr 9, 2019 at 9:55am PDT

And the other one on the effect of skin colour on average hourly wages.
Curriculum Tags: MDM4U
https://www.instagram.com/p/BwKROlsHaN_/

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Colorism affects how much money you earn... Economics professors studied the wages of men aged 19–65 who were working, not self-employed, and earning less than $100k per year. They found that those with lighter skin earned more. Source: Arthur H. Goldsmith et al, The Journal of Human Resources 42(4), 2007

A post shared by Mona Chalabi (@monachalabi) on Apr 12, 2019 at 8:26am PDT

Math Links for Week Ending Apr. 5th, 2019

Featured Links
I am at NCTM this week in San Diego so I think just about everything will be NCTM-centric and so that's why this is a day late. First up, I presented a session called "Data Looks Pretty Good" which was all about interesting data sets that you can look at and/or analyze (using Desmos or CODAP). The slideshow is full to the brim with data sets and extra links enough to keep anyone busy.
Curriculum Tags: MDM4U, MBF3C, MAP4C
http://bit.ly/nctm2019petro

Resource Links
Two brand new Desmos features for Activity Builder. First, now you can upload live pictures of student work (eg. that they are doing at their desk on paper) and upload it to your teacher dashboard. Basically what happens is that while  you are in Snapshots you can click a button to email you a special link that will let you upload photos from your phone. Secondly, we can finally organize our favourite activities by creating a Collection. You can create as many collections as you want and add any activity to more than one collection.
Curriculum Tags: All

Finally a way to organize your @Desmos Activities. Use Collections. Just launched this morning. Try it out at https://t.co/yVt0MvZWJy #mtbos #MathChat #ITeachMath #NCTMSD2019 pic.twitter.com/BhOkKDDVjx

— David Petro (@davidpetro314) April 3, 2019

There was a lot of sessions discussing ideas around equity and one that I saw was from @LBmathemagician. She spoke about (de)tracking students and I think her talk can be best summed up by @RobertKaplinski's tweet.
Curriculum Tags: All
http://bit.ly/DetrackingLNB

"I don't think we've achieved equity for all. We achieved equity for more, and we have a lot more work to do." - @LBmathemagician. I am blown away by by her presentation! Absolutely fantastic speaker and meaningful #NCTMSD2019

— Robert Kaplinsky (@robertkaplinsky) April 4, 2019

I didn't get to this session from @IanKerr_math, @McCormick_Math, and @rweychert but thanks to @Approx_Normal I found out about it. Check out her Twitter thread. Just the hearing about the new (to me) sports stats sites was good enough (Swish 2.0, Spotrac & Statsbomb - plus one that I recently found out about and mentioned in my above talk, Baseball Savant). Make sure you follow the whole thread.
Curriculum Tags: MBF3C, MAP4C, MDM4U
https://twitter.com/approx_normal/status/1113847412651462657

Sports analytics with @IanKerr_math @McCormick_Math @rweychert #NCTMSD2019 pic.twitter.com/26w61vSyKk

— ~Hedge~ (@approx_normal) April 4, 2019

So I have always admired @Dandersod's  http://dailydesmos.com/ site from afar thinking that I couldn't do those things but I went to his session and low and behold, it's not that hard. You can try the Desmos activity here and see for yourself and check the link below for all the other resources.
Curriculum Tags: All
http://bit.ly/makingmathart




I saw @mathgarden's session about his and @cbrownLmath new book Math Recess. It's their view that we have to do more playing with math and the book is full of examples how. And as an added bonus, I got a mention in the book because I like to use the word "tinker" with math. Check it out.
Curriculum Tags: All
https://www.amazon.ca/Math-Recess-Playful-Learning-Disruption/dp/1948334100/ref=sr_1_fkmrnull_1?crid=2E5IC34F7EFBT&keywords=math+recess+singh&qid=1554605826&s=gateway&sprefix=math+recess%2Caps%2C187&sr=8-1-fkmrnull


Video Links
I was just blown away by the short session by Stephen Clower (who is blind) and @shapeoperator about how Desmos is helping the visually impaired. Watch and listen to the video below to see how.
Curriculum Tags: All
https://twitter.com/davidpetro314/status/1113960382056488960

Check out Stephen Clower (& @shapeoperator )letting us listen to accessibility features for the visually impaired on @Desmos check out their talk notes at https://t.co/rks8whvoyB and listen on your own below #mathchat #mtbos #lteachmath #NCTMSD2019 pic.twitter.com/UfORJnTPnf

— David Petro (@davidpetro314) April 5, 2019

I really loved @MathButler and @MrsNewell22's session on Desmos geometry. Lots of great ideas and simple tweaks to what you're already doing.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P
http://bit.ly/nctm19-geometry

There was this and more in @MathButler and @MrsNewell22 's session on Geometry at #NCTMSD2019 . Get this visual trapezoid area proof and other geometry goodness herehttps://t.co/eLasrnfgqF#mathchat #MTBoS #IteachMath pic.twitter.com/LMpJisxFEH

— David Petro (@davidpetro314) April 5, 2019

Image Links
Some great ideas from @saravdwerf
Curriculum Tags: All
https://saravanderwerf.com/


I realize this is just a picture but I hope you can get the gist of it. To practice dilations you just need two rubber bands.
Curriculum Tags: Gr7, Gr8
https://twitter.com/davidpetro314/status/1114189338697273344

Love this way to have kids draw dilations from @MrVaudrey & @VbergMath use 2 rubber bands tied with a knot. Hold one end with your finger and the other with the pencil. Stretch them out and use the knot to trace out your original image. #nctmSD2019 #mathchat #MTBoS #iteachmath pic.twitter.com/VfyZ4mEYIZ

— David Petro (@davidpetro314) April 5, 2019

Check out these two slides from @mathematize4all about students with dyslexia and dyscalculia. The stories from @dylanmlynn and @gelada of how they overcame their LD issues to become awesome mathematicians were great.
Curriculum Tags: All
https://twitter.com/davidpetro314/status/1114292678319939584

Worried about LDs? Check out the strengths of those with #dyslexia and #dyscalculia and how they support mathematical thinking via @mathematize4all & @Gelada at #nctmSD2019 #mathchat #MTBoS #iteachMath pic.twitter.com/b1Lhq7iQKN

— David Petro (@davidpetro314) April 5, 2019

Here's a great strategy from @Mr_Stadel to help get kids talking
Curriculum Tags: All
https://twitter.com/davidpetro314/status/1114570269543108608

Get students talking to each other using the Campfire strategy. @mr_stadel says give them these prompts and let them discuss at #nctmsd2019 #mathchat #mtbos #iTeachMath pic.twitter.com/d4FcaJl0aR

— David Petro (@davidpetro314) April 6, 2019

It was great to meet @MrsNewell22 and hear about her #MathGals shirts. You should totally get one (or four). The proceeds are all donated so it's totally worthwhile
Curriculum Tags: All
https://twitter.com/MrsNewell22/status/1114155915815469062

If you need a #MathGals shirt in your life, find one here! (Bonus: 15% off now until April 9th!) https://t.co/GmnrQRSrfd

— Chrissy Newell (@MrsNewell22) April 5, 2019

Some math related pictures I took while at NCTM:
Curriculum Tags: Gr7, Gr8
https://www.instagram.com/p/Bv4UnACHqFF/
https://www.instagram.com/p/Bv5LoitHP6v/
https://www.instagram.com/p/Bv7CvGBH_ii/

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What do you notice ? What do you #wonder ?

A post shared by David Petro (@lookimyourfather) on Apr 5, 2019 at 9:09am PDT

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#circular lights

A post shared by David Petro (@lookimyourfather) on Apr 5, 2019 at 5:10pm PDT

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Is this a #disco #tessellation ?

A post shared by David Petro (@lookimyourfather) on Apr 6, 2019 at 10:30am PDT

Math Links for Week Ending Mar. 29th, 2019

Featured Links
So this just fascinated me that such a simple looking sinusoid related equation can have a graph that looks like this
Curriculum Tags: All
https://twitter.com/LukeSelfwalker/status/1110640257404407813

Go to https://t.co/oQe1YNrDFq

1) Create a slider a=1.
2) Plot cos(ax+y)≤sin(x-ay)#RandomActsOfDesmos pic.twitter.com/VekNTVssBU

— Luke Walsh (@LukeSelfwalker) March 26, 2019

Resourse Links
Some mathematical ties from @MrNiksMathClass. A nice visualization of families of functions. You might extend this to sinusoidal functions or polynomial functions too. Click on the link to get the solution.
Curriculum Tags: MCR3U, MHF4U
https://twitter.com/MrNiksMathClass/status/1109795357683261440




Also from @MrNiksMathClass is this deep thinking calculus problem idea where you take away the vertical axis for students to do their analysis with. Click on the link to get the solution
Curriculum Tags: MCV4U
https://twitter.com/MrNiksMathClass/status/1110130693101752322







Did you know that if you have your music stored in an iTunes library, that it's loaded with data just waiting for you (and your students) to analyze? Yup, it turns out that there is metadata associated with each song and you can get that data to analyze. Check out the link for all the ways.
Curriculum Tags: MDM4U
http://found-data.blogspot.com/2019/03/mining-meta-data-in-your-itunes-library.html

Opinion Links
Focussing on visual learning and mental math is the theme of this post from @HTheijsmeijer where she talks about her experience with these things in a grade 8 & 10 class. Some good tips including choosing your representations ahead of time and practicing your annotations in advance. Read on below
Curriculum Tags: All
http://modelthelearning.blogspot.com/2019/03/when-drawing-is-not-just-drawing.html

Video Links
Nothing like some math fun with this animated birthday cake from @von_oy
Curriculum Tags: All
https://twitter.com/von_Oy/status/1109251178230153216

A @Desmos birthday cake!https://t.co/zhZiK4QSjf#MTBoS #iteachmath #mathart pic.twitter.com/5j7ah42jFg

— Suzanne von Oy (@von_Oy) March 23, 2019

Here, @SumDumThum continues to create these animated tessellation patterns
Curriculum Tags: All
https://twitter.com/SumDumThum/status/1109229911141552128

https://t.co/mdygcW79z8 pic.twitter.com/fPmn7r7i5D

— Andrew Osborne (@SumDumThum) March 22, 2019

It seems these dynamic data visualizations of top 10 lists continue. Since baseballs season has started, here's one about players with the most walks over the last 100 years or so.
Curriculum Tags: MDM4U
https://twitter.com/darenw/status/1108512230532886529

Top 10 all time @MLB walks by year starting in 1900. 🚶🚶🚶 pic.twitter.com/3PCgqfsPI0

— Daren Willman (@darenw) March 20, 2019

And here's another one. This time its largest cities over the last 500 years. Thank to @KMarkPet for this one.
Curriculum Tags: MDM4U
https://www.youtube.com/watch?v=k2uoqJmJaGo

Image Links
Yup, it's a problem
Curriculum Tags: All
https://twitter.com/MrsNewell22/status/1110960377762705409

Dear @Walmart,
This shirt, which is marked as "hilarious girls' shirt" on your website, is offensive, inappropriate, & contributing to negative stereotypes about girls. As a mom & educator, I ask you to remove this product immediately. #MTBoS #MathGals
PLEASE RETWEET! pic.twitter.com/NpRkZa8HtF

— Chrissy Newell (@MrsNewell22) March 27, 2019

Yup, Units matter
Curriculum Tags: Gr7, Gr8, MBF3C, MAP4C
https://twitter.com/robertkaplinsky/status/1110212353574858752

Have you heard of the "world's littlest skyscraper" in TX? They got funding in 1919 saying it would be 480 tall. Investors assumed they meant 480 feet but it was labeled 480 inches in the blueprints. The investors sued and lost: https://t.co/6ozW4MVaAh #unitchat #mp6 pic.twitter.com/uIQTUR1ul2

— Robert Kaplinsky (@robertkaplinsky) March 25, 2019

Check out the comments for all the interesting solutions.
Curriculum Tags: MCR3U
https://twitter.com/Cshearer41/status/1110638446861799424

The right-angled triangle covers ¼ of the square. What fraction does the isosceles triangle cover? pic.twitter.com/idbNgdFNnW

— Catriona Shearer (@Cshearer41) March 26, 2019

Math Links for Week Ending Mar. 22nd, 2019

Featured Links
It's always good to hear that the folks at @ONmathies continue to refine and update their apps. The latest is a fresh version of the pattern block app. So now, not only do you have an infinite amount of pattern blocks to use but you have more than the standard blocks (with more to come) but you can now save your work and upload it later. Here is the saved file from this image if you want to try out uploading into your own Patter Block app.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P
https://mathies.ca/learningTools.php#Pp0

Resource Links
I have long been an advocate of coupling proving trig identities algebraically with verifying them graphically. Now @LukeSelfWalker has had the same idea and taken it to the next level with @Desmos Activity Builder. Check it out.
Curriculum Tags: MCR3U, MHF4U
https://twitter.com/LukeSelfwalker/status/1107974858745491456

Using the Desmos table feature as a structure in proving trig identities. Then students see graphs of all of their steps as a way to check to their work. There is a lot of opportunity here to use snapshots in showcasing different paths for a proof. https://t.co/xEGe76HCNX pic.twitter.com/sLaNYrTyHl

— Luke Walsh (@LukeSelfwalker) March 19, 2019

Do you want to have your students practice their fundamental skills in an engaging way? Then you might want to use @GFletchy's subitizing multiplication cards. This is an update to his original cardset and includes over 100 cards including some to focus on students moving away from counting.
Curriculum Tags: Gr7, Gr8, MAT1L, MAT2L
https://gfletchy.com/2019/03/17/multiplication-subitizing-cards/

Here's a neat idea, @MrNiksMathClass has developed what he calls Elastic Band Puzzles where the purpose is to find the sets of values that have the same characteristic. In these three examples it's the zero principal, fractions adding to 1 and factorable trinomials.
Curriculum Tags: Gr7, MPM1D, MFM1P, MPM2D, MFM2P
https://twitter.com/MrNiksMathClass/status/1106497179127025664

These are examples of my "Three Elastic Bands Puzzles" (simple to make, use with any concept, packed with thinking). Pick a theme and create 3 groupings. Then, challenge your kids to identify the groups by drawing non-overlapping elastic bands around each. #tvdsbmath #iteachmath pic.twitter.com/ZdBqLunna7

— Math with P. Nik (@MrNiksMathClass) March 15, 2019

This data originally came out in 2014 but has recently been updated with 75 new artists. It shows the hip hop artists who have the highest number of words used in their first 35000 lyrics. The data is interactive on the original post and I have pulled out the raw data so that your students can actually use it for some single variable analysis.
Curriculum Tags: MDM4U, MBF3C
https://found-data.blogspot.com/2019/03/hip-hop-vocabulary.html

Video Links
Here's a nice video display of some data about the proportion of highest paid artists who are female from @MonaChalabi. It's a simple representation but the animation makes it look so elegant.
Curriculum Tags: MDM4U
https://www.instagram.com/p/BugsC0Jlu9Z/?utm_source=ig_web_button_share_sheet

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Art never seemed like a career that could give me financial security (and good god I want financial security). The fact is, women's art is just valued less than men's art. At best, 7 of the 100 highest paid artists in the world have been women, at worst, just 1. Biiiiiig thank you to @tate and @womeninthearts for commissioning me to do this! Source: Magnus.net (2007-2017)

A post shared by Mona Chalabi (@monachalabi) on Mar 2, 2019 at 7:29am PST

Some interesting looking patterns.
Curriculum Tags: Gr7, Gr8
https://twitter.com/solvemymaths/status/1106868124090011648

1 + 2 = 3

4 + 5 + 6 = 7 + 8

9 + 10 + 11 + 12 = 13 + 14 + 15

16 + 17 + 18 + 19 + 20 = 21 + 22 + 23 + 24

n²+(n² +1)+...+(n²+n)=(n²+n+1)+...+(n²+2n) pic.twitter.com/GMbeh5BpPO

— Ed Southall (@solvemymaths) March 16, 2019

Image Links
I love this visualization from @MonaChalabi where she looks at the preferred age of date from dating site data. It's pretty interesting how this is split by gender.
Curriculum Tags: MDM4U
https://www.instagram.com/p/BvPK8-hHFnx/?utm_source=ig_web_button_share_sheet

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Preparing my slides for a talk tonight @nytimes about why I don’t date older men. See second photo 🤮. Source: Data from OKCupid's users, 2014 (tens of millions of preferences were analysed by the site's founder Christian Rudder. I also copied his data visualisation technique here because it works so well). I'm really sorry that there isn't good data on same-sex attraction - will keep hunting!

A post shared by Mona Chalabi (@monachalabi) on Mar 20, 2019 at 9:36am PDT