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