## Friday, March 31, 2017

### Math Links for Week Ending Mar. 31st, 2017

I love this site (that is new to me) called Graph of the Week. Kathy Turner has been showing her kids a graph of the week for years but now has some of her collection on this site for the rest of us. Each graph (or set of graphs) comes with some possible questions for prompts for students. Thanks to Janet Jacques for this one
Curriculum Tags: Gr7, Gr8, MBF3C, MDM4U, MAP4C
http://www.turnersgraphoftheweek.com/

This is a common application of Pythagorean Theorem to compare sizes of TVs, but it is always good to see practical applications of math. In this case it's linked specifically to phone screen sizes. Thanks to @MatthewOldridge for pointing this one out.
Curriculum Tags: Gr8, MPM1D, MFM1P, MFM2P
http://www.theverge.com/tldr/2017/3/30/15120824/screen-aspect-ratio-mathematics-galaxy-s8-lg-g6

Many of you may have done Barbie Bungee with your kids. It's so fun. If so you might like to try Barbie Zipline from @jStevens009 Curriculum Tags: MPM1D, MFM1P
http://www.fishing4tech.com/fishin-solo-blog/back-to-school-barbie-zipline-30

If you have seen Hidden Figures then you know that one of the stars of the movie is math. On this post they explore some of the math concepts.
Curriculum Tags: All
https://www.insidescience.org/news/exploring-math-hidden-figures

Need to have your kids practice graphing points? Why not give them this Desmos Marbleslides where they play "golf" by plotting points.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P
http://blog.desmos.com/post/158788745322/friday-fave-for-march-24

The first time I heard of Sophie Germain was in the movie Proof. You can read about how she lead the way for female mathematicians here
Curriculum Tags: All
https://www.brainpickings.org/2017/02/22/sophie-germain-gauss/

Another one from @standupmaths with bricks. This time it's that classic physics problem of stacking bricks so that the overhang of the last brick is beyond the first. Though the premiss of this is based on centre of mass, you can do some mathematical modelling with the result. See this Desmos sketch to see how.
Curriclum Tags: MBF3C, MCR3U, MAP4C, MCT4C

Building a thinking classroom is a great idea. And @Wheeler_Laura has some great sketch notes to help you along. I showed some a few weeks ago, they are at this link and more along with a lot of other ways to change over to a thinking classroom.
Curriculum Tags: All
https://mslwheeler.wordpress.com/2017/03/15/building-thinkingclassrooms/

Need a bad graph? Thanks to @Trianglemancsd for pointing out this one
Curriculum Tags: Gr7, Gr8, MBF3C, MDM4U
https://christopherdanielson.wordpress.com/2017/03/06/turd-pizza/

I love this picture from @MarkChubb3 for fraction connections. It's visual and the instructions are easy to implement in your class
Curriculum Tags: Gr7, Gr8

Here is a neat geometry problem with some Sketchpad interactives from @dpscher. "The five triangles below are all isosceles. The quadrilaterals are all rhombi. The shaded quadrilateral is a square. What is the area of the square?"
Curriculum Tags: Gr7, Gr8
http://www.sineofthetimes.org/a-geometry-challenge-from-japan/

Hand drawn colouring book shows the beauty of the Golden Ratio. See many of them at the link below.
Curriculum Tags: All
http://www.boredpanda.com/architect-reveals-the-secret-of-natures-beautiful-designs-in-a-hand-drawn-coloring-book/

## Friday, March 24, 2017

### Math Links for Week Ending Mar. 24th, 2017

I'm getting caught up on a lot of blog posts lately and the Desmos crew have been busy. Some neat little activities have been released over the last few weeks. You can practice working with angles in this laser/mirror simulation. Practice with linear functions (kind of like Central Park) by starting with estimation. Do some exponential decay by bouncing balls. And more linear expressions with this interactive border problem.
Curriculum Tags: MPM1D, MFM1P, Gr7, Gr8, MCR3U, MAP4C
http://blog.desmos.com/post/157371596612/friday-fave-for-february-17
http://blog.desmos.com/post/157668916512/friday-fave-for-february-24
http://blog.desmos.com/post/158244468172/friday-fave-for-march-10
http://blog.desmos.com/post/158522882937/friday-fave-for-march-17

A few weeks ago I posted Dan Finkel's TED talk about being a math teacher. It featured a really cool factor model. It turns out I missed this other factor model that @dpscher featured another cool model and added some interactives and a how to video to go along with it.
Curriculum Tags: Gr7, Gr8
http://www.sineofthetimes.org/creating-animated-factorization-diagrams/

Here's a really cool interactive from @EmathsUK on rates of change where you have to create your own custom flask and then guess what the filling profile will look like. It's different version of this classic question than Desmos' Waterline but still a great activity.
Curriculum Tags: MCV4U

I like this combination Google slides primer and how to develop thinking in a math classroom from @alicekeeler. I really like the idea of showing the thinking process including all of the mistakes. Take a look
Curriculum Tags: All

Some leftovers from PiDay. This one from @mathequalslove giving us this geometric puzzle
Curriculum Tags: All
http://mathequalslove.blogspot.ca/2017/03/square-pi-puzzle-for-pi-day.html

Another PiDay leftover from @rjallain. This time by using a random walk. He goes into all the detail with algorithms and the graphical analysis.
Curriculum Tags: All
https://www.wired.com/2017/03/hey-can-find-pi-random-walk-heres/

And the last leftover from PiDay comes from the Physics Girl and Veritasium. Here they calculate Pi by throwing darts at a target. Again, more randomness. Watch the video at the link below
Curriculum Tags: All
http://thekidshouldseethis.com/post/calculating-pi-%CF%80-with-darts

It all starts with counting. Before we can do any math we have to count. That is part of the premiss of the book "Numbers and the Making of Us: Counting and the Course of Human Cultures" from Caleb Everett. Here is an interview with the author about the topic.
Curriculum Tags: All
https://fivethirtyeight.com/features/why-do-we-count/

Here is a nice interview with @mathletepearce from @DerekRhodenizer on the current state of math teaching. I liked the bit about if you were in a home where your parents yelled, then likely you will be a yelling parent until you become mindful of how to break that pattern. For many of us that's what teaching is. We teach how we were taught until we see a better way
Curriculum Tags: All
http://voiced.ca/beyond-the-staffroom/

I like this visualization from @mathletepearce on visualizing x/6 = 2
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P

A new @numberphile video on Pascal's Triangle. Even though many of the patterns mentioned I knew of there were a few tidbits that I hadn't.
Curriculum Tags: All

And another one from @numberphile on the four colour theorem. I love the four colour theorem and especially because it's proof marked the beginning mathematical proofs via computer.
Curriculum Tags: All

A new TED talk from @JoeBoaler on mathematical mindsets
Curriculum Tags: All

An interview by @Anthony_Bonato with @JSEllenberg who wrote the book "How Not To Be Wrong: The Power of Mathematical Thinking" and if you want you can watch this talk from a couple of years ago
Curriculum Tags: All
https://anthonybonato.com/2017/03/22/interview-with-a-mathematician-jordan-ellenberg/

The Giant's Causway is a fabulous example of how nature has many strange secrets. So cool that these hexagonal rock formations were create naturally. Check out all the pictures at the link below.
Curriculum Tags: All
http://geometrymatters.tumblr.com/post/158582569164/the-giants-causeway-the-hexagonal-rock-columns

Who knew there were so many types of quadrilaterals
Curriculum Tags: Gr8

Here's a neat visualization of the top 100 websites currently
Curriculum Tags: MDM4U

Here's a few more images left over from Pi Day
Curriculum Tags: All

## Friday, March 17, 2017

### Math Links for Week Ending Mar. 17th, 2017

I have loved Desmos Activity builder since it came out. Over the last year or so I have taken a stab at creating a bunch of these. They run the gamut of some geometry stuff from grade 6 to Calculus and in between. Try them out and let me know if you see room for improvement.
Curriculum Tags: All
http://engaging-math.blogspot.ca/p/desmos-activities_10.html

I love when things are made visual (and interactive). This site does both, although some of the concepts go beyond elementary and secondary math, there is enough here that you can still find something to bring statistics to life for your kids. Thanks to @Sharon_Drummond for this one.
Curriculum Tags: Gr7, Gr8, MBF3C, MDM4U, MAP4C
http://students.brown.edu/seeing-theory/

How about a fun clock that requires you do do math (order of operations) to tell the time? Thanks to @kMarkPet for this one.
Curriculum Tags: All
http://nerdist.com/this-awesome-clock-makes-you-do-math-to-figure-out-the-time/

It was PiDay this week. You can see all of my Pi related links on my PiDay Pinterest board here. Here's a few more. This one from Science Friday.
Curriculum Tags: All
https://sciencefriday.com/spotlights/pi-day/

I made this video to explain how to make your own Desmos Marbleslides.
Curriculum Tags: All

My daughter pointed these out to me. They are a series of videos where they survey 100 people (usually they were made of demographically diverse groups) about various topics and ask them to choose yes or no by stepping into a circle. A lot of the questions are US centric (but not all). But you might be able to use them to talk about surveying and bias. Click on the link below for all of the videos in the first season.
Curriculum Tags: Gr7, Gr8, MBF3C, MDM4U, MAP4C

I love this video from @standupmaths where he approximates Pi by randomly rolling two 120 side dice 500 times and breaking them up into numbers that have cofactors and those that don't (and if you want here's the 2hrs of raw footage). You could easily repeat this in a class and wrap it around the idea of factors of numbers. So good.
Curriculum Tags: All

Here's a video for PiDay on why Pi is important. As if we need to know.
Curriculum Tags: All

And what is PiDay without a song
Curriculum Tags:All

Although they admitted to this being Photoshopped, it's still nicely done.
Curriculum Tags: All
If you wanted you cold have run a virtual 5km race on Pi Day. I guess that means you register and pledge to run 5km on PiDay and they send you a medal. At least the medal is very cool. Thanks @Robin_Grondin for this one.
Curriculum Tags: All
https://www.virtualpaceseries.com/portfolio-item/pi-day-3-14/

And finally a Pi related question with what has a surprising (at least to me) result. Thanks to @Esping_math for this one.
Curriculum Tags: Gr8

## Friday, March 10, 2017

### Math Links for Week Ending Mar. 10th, 2017

If you haven't been following @marybourassa's venture into a full thinking calculus classroom, she just posted her first full unit which was on derivative rules. Keep following her if you are looking to make your calculus class a thinking classroom too.
Curriculum Tags: MCV4U
http://marybourassa.blogspot.ca/2017/03/full-unit-in-thinking-classroom.html
This is kind of neat. This restaurant puts the calories, protein, fat and carbohydrates for exactly what you ate on your bill. You could do some fun proportional reasoning with this. Thanks to Janet Jacques for this one.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P, MAT1L
http://www.mediapost.com/publications/article/128527/burgerville-receipts-provide-orders-nutrition-inf.html?edition=

I just finished this Desmos activity on position-velocity-acceleration functions. The reason I did it this way was because I always felt that students often didn't get that this was motion in a straight line. So it was nice to be able to show the motion explicitly.
Curriculum Tags: MCV4U
https://teacher.desmos.com/activitybuilder/custom/572c3338d7cb120b107985d5

This past week we had International Women's Day. So it is appropriate to have at least one article to commemorate it.
Curriculum Tags: All
https://www.quantamagazine.org/20170308-women-math-physics/

I don't think we can have enough stories and essays about loving math. Here's one from @mathgarden
Curriculum Tags: All
https://medium.com/@sunilsingh_42118/teaching-mathematics-with-love-intimacy-and-storytelling-497ec8e61ccb#.32ht0gpro

We've just done some PD at our board about formative assessment and we used some of Damian Cooper's stuff. Here @MarkChubb3 talks about a lot of what Cooper says along with some @marian_small and @JoeBoaler too. I love the first analogy that he relays from cooper about what made the biggest difference for figure skaters at the Olympics, the coaches or the judges. I'll let you read on in his post to find out.
Curriculum Tags: All
https://buildingmathematicians.wordpress.com/2017/02/25/who-makes-the-biggest-difference/

The link above about the calories on the restaurant bill reminded me of this @mathalicious video from a few years back.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P