## Friday, June 23, 2017

### Math Links for Week Ending June 23rd, 2017

So last week there was a viral tweet that went out with a sign at a deli that forbade talking about mathematics. Here's the story behind that sign.
Curriculum Tags: All
Apparently last week it was World Tessellation Day. So I reposted a dynamic sketch that I've had for a while. Go ahead try it out to make your own Escher sketch.
Curriculum Tags: Gr7, Gr8
http://mail.wecdsb.on.ca/~david_petro/WebSketches/Tessellation/index.html

Combine this Which One Doesn't Belong with @MrVaudrey's Mullet Ratio Activity and you have a winner.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P
http://mrvaudrey.com/2012/05/03/the-only-lesson-theyll-remember/

I love showing this video to students to remind them that we are all doing complex math all the time. That is, every time we catch a ball, our brain is doing complex mathematics to figure out where to put our hands to catch it. In this clip, Willy Mays see's the ball hit and immediately turns around and sprints to where he thinks the ball will land. The problem that most students have is putting those calculations on paper.
Curriculum Tags: MPM2P, MFM2D, MCF3M, MBF3C, MCR3U

Last week we were at the last RMS session of the year and there were a lot of math related pics going around.
Curriculum Tags: Gr7, Gr8
Some data about the new Wonder Woman movie via @DataIsBeautiful
Curriculum Tags: MDM4U

## Friday, June 16, 2017

### Math Links for Week Ending June 16th, 2017

As @ddmeyer points out, this XKCD image has been out for a while and he has suggested it be used for introducing the topic of the coordinate plane before but now he and his crew have Desmosified it into a really fun and dynamic way to introduce the concepts of the coordinate plane (or even help fill the gaps in for those who still struggle with graphing points). The premiss is pretty simple: given various fruits, decide where it fits on a linear tasty/untasty scale and a perpendicular linear Easy/Difficult (to eat) scale.
Curriculum Tags: Gr7, Gr8
http://blog.mrmeyer.com/2017/pomegraphit-how-desmos-designs-activities/
Here's a nice twist on a standard concept from @dpscher. We've all seen 10x10 multiplication grids before (both static and dynamic) where students have to look for multiples of what ever number. But now that 10x10 grid itself is dynamic. That is, it's dimensions. So you can have your kids explore how the patterns change as the grid changes. This may seem really elementary but students who have good number sense will have an easier time when performing other math tasks. So students at any grade can practice with this to hone their skills.
Curriculum Tags: All
http://www.sineofthetimes.org/exploring-multiples-on-a-dynamic-number-grid/

I love this lesson from @Wheeler_Laura where she takes advantage of her student winning Gold at OFSAA in the 1500m championship (pretty fast - almost cracked 4min in grade 9). She turns that into a 3Act task where she has her students wonder how much of a head start they would need so if they were walking and he was running, they would end up at the finish line at the same time. And like any good 3Act task there is a great reveal. In this case, she has her students actually do the experiment. Check out the link for the entire lesson.
Curriculum Tags: MPM1D, MFM2P

I remember a time (more than 15 years ago) when I was just getting into the groove of having students investigate mathematics as a matter of habit when one student asked "sir, when are you going to teach us". Heavy sigh. None the less, I am always happy when others share thoughts on this same mater. In this case from @K8Nowak with the title "So When do I teach?" where that is being asked by a teacher.
Curriculum Tags: All
http://function-of-time.blogspot.ca/2017/06/faq-so-when-do-i-teach.html

"Math requires altruism, hard work and fact-checking. " - That's what @mathbabedotorg says in her article sighting that not all mathematicians are geniuses. And for every "genius" there's a hundred people that helped create them along the way.
Curriculum Tags: All
https://www.bloomberg.com/view/articles/2017-06-07/a-mathematician-s-secret-we-re-not-all-geniuses

"Forget speed: why the tortoise will always prevail in mathematics" that is, forget speed when it comes to math. If you want to go deep then slow down. Read more here from @fjmubeen. Thanks to @matthewoldridge for pointing out this one
Curriculum Tags: All
https://mystudentvoices.com/forget-speed-why-the-tortoise-will-always-prevail-in-mathematics-a472737d94df

I totally love this new video and activity from @MrOrr_Geek. Just watch the video below and tell me you are not right in there ready to solve. Of course there is a whole lesson that goes along with this so make sure you go to the link below to get it all.
Curriculum Tags: MPM1D, MFM1P
http://mrorr-isageek.com/polygon-pile-up/

This one showed up all over Twitter this week. There is a story here for sure.
Curriculum Tags:All

## Saturday, June 10, 2017

### Math Links for Week Ending June 9th, 2017

If you haven't seen @MrOrr_Geek's Math Before Bed then shame on you. The good news is that you're in luck. He just launched the companion site https://mathbeforebed.com/ . One of my favourite things about Math Before Bed is that you might get the impression that it's a book just for younger kids and that is probably who it's aimed for. But there are great questions that are framed in a way that a younger kid could do but touch on much bigger topics. And just about any of these could be used as a math starter or discussion piece in just about any class. And if you like this then you might want to get your own copy for your kids.
Curriculum Tags: All
https://mathbeforebed.com/

I have been neglecting my Found Data site for months now. I have many unfinished posts so I thought I would start to clean that up. One of first ones I had to get out was this Github site from Five Thirty Eight. Of course Five Thirty Eight are all about data and, as it turns out, there are a bunch of their stories that they have made the data sets available. And some of these sets are huge. Like this one about Classic Rock that has over 37000 pieces of data. So if you are looking for some interesting sets of data (especially categorical data) then check this out.
Curriculum Tags: MDM4U
http://found-data.blogspot.ca/2017/06/five-thirty-eights-pile-of-data.html

The other thing I did this week was start to generate some dynamic 3D sketches for the vector unit of MCV4U using Geogebra. These will probably only be useful to you if you are using the McGraw Hill Calculus and Vectors textbook as they are just dynamic versions of the chapter 7 examples (chapter 8 is to come).
Curriculum Tags: MCV4U

In May our school board celebrated Canada 150 by asking students to come up with math questions that were about Canada that had an answer of 150. You can see some of the results here on Twitter. @Mathletepearce is also getting into the Canada 150 spirit by having students at his board complete some Canada 150 challenges. Here's a great proportional reasoning 3Act task dealing with a large rubber duck and the CN Tower.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P
https://tapintoteenminds.com/3act-math/giant-rubber-duck/

I have seen this dynamic sketch for Geometer's Sketchpad but someone has done the math and created it for Desmos. Approximating Pi by the Method of Exhaustion is super cool and interesting that it has been done for centuries with little technology. Thanks to @Esping_Math for pointing out this one.
Curriculum Tags: All
https://www.desmos.com/calculator/dqb20fhld3

Tired of hearing about fidget spinners? Turn it into a math problem about how fast the spinner is going.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P

This is a neat site that is set up for people when they are out of school to brush up on their math skills. But there is a lot of stuff you could use in classes too.
Curriculum Tags: All
https://www.citizenmaths.com/

Well said. Thanks to @kmarkpet for this one:
Curriculum Tags: All

So simple but it could yield so much discussion. And check out @mathforlove's comment with a slight tweak.
Curriculum Tags: All

## Friday, June 2, 2017

### Math Links for Week Ending June 2nd, 2017

I like the idea of students working on intuitive thinking. And it seems so does @markchubb3. That is what his OAME 2017 talk was about. He breaks it down slide by slide in this post.
Curriculum Tags: All
https://buildingmathematicians.wordpress.com/2017/05/25/building-our-students-mathematical-intuition/
I have not seen this type of activity before. It's called a spider puzzle. In this case they are for mean, median and mode. Here there is a set of numbers in the middle with a missing value and then various scenarios around that have to be solved by choosing the correct value. I also like the idea of using dry erase pockets to work on these sheets without actually using them.
Curriculum Tags: Gr7, Gr8
http://mathequalslove.blogspot.ca/2017/05/mean-median-mode-and-range-spider.html

I love the theorem that if you take any quadrilateral, take the midpoints of each side and connect them and no matter what you will always create a parallelogram. Apparently this is called Varignon's theorem and thanks to @dpscher we now have a dynamic sketch to play around with it
http://www.sineofthetimes.org/digging-deep-into-varignons-theorem/

I like this little activity from the folks at @desmos. It's relatively simple but does a good job in visualizing proportional reasoning and direct variation
Curriculum Tags: MPM1D, MFM1P
http://blog.desmos.com/post/161108227092/friday-fave-for-may-26

This is old but if you are looking for a video demonstrating projectile motion ......
Curriculum Tags: MPM2D, MFM2P, MCR3U, MCF3M, MBF3C

If you haven't been to the Would You Rather Math site. Check it out. Here's the latest
Curriculum Tags: All
http://www.wouldyourathermath.com/depreciation/

## Saturday, May 27, 2017

### Math Links for Week Ending May 26th, 2017

I love the idea that @ddmeyer has to make people new to Twitter feel welcomed. He commissioned a Chrome extension that scrapes Twitter and looks for certain criteria then pushes those Tweets his way where he can respond. I this case he gives them a "hello" from the Twittervers (specifically the MTBoS). Try it out
Curriculum Tags: All
http://blog.mrmeyer.com/2017/how-i-welcome-newcomers-to-online-teacher-professional-development-aka-the-mtbos-and-how-you-can-too/
This is a fun little activity that connects angles with fractions and proportional reasoning. It starts in that way that is becoming familiar in the Desmos world. That is, guessing followed by something structured followed by something algebraic. You could probably do the first few slides with younger students but the algebraic stuff would be more suitable with gr9 or above.
Curriculum Tags: MPM1D, MFM1P
http://blog.desmos.com/post/160846021437/friday-fave-for-may-19

With all the math wars (back to basics or let them investigate). Of course it really needs to be a balance. But how to make that work? That's the hard part. Some insights from @HTheijsmeijer on the topic.
Curriculum Tags: All
http://byodasap.blogspot.ca/2017/05/finding-balance-in-math.html

At the helm at Critical Math was @Roosloan sharing her curated list of research about that thing called math.
Curriculum Tags: All
https://criticalmath.ca/2017/05/11/a-collection-of-research-articles-curated-by-roosloan/

I have always suspected that stickynote glue was stronger than you think. The trick, apparently, is the way that you apply the force. Check out the video and then the 3Act math task that @mathletepearce put together around it.
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P
https://tapintoteenminds.com/3act-math/sticky-note-challenge/

A couple of image related puzzles on Five Thirty Eight's Riddler column. For example this one about trying to cut this figure into three pieces that can then create a square.
Curriculum Tags: All
https://fivethirtyeight.com/features/can-you-do-math-without-numbers/

The geometry of fruit
Curriculum Tags: Gr7, Gr8
http://geometrymatters.tumblr.com/post/160508152074/geometrymatters-geometry-of-fruits-and

Some fun animations. Click on the link to see them all
Curriculum Tags: All

## Friday, May 19, 2017

### Math Links for Week Ending May 19th, 2017

This site is so slick. The premiss is trying to measure the repetitiveness in songs by seeing how compressible the lyrics are. That itself might not be so exciting but the way that they present the data is very neat. Just scroll down the page and see it presented to you in a dynamic way. There are interactive graphs so you can test out your own theories. Even if all you do is look at the normal distribution it's still pretty cool. I only wish all the data was available for download.  Thanks to @Esping_math for this one.
Curriculum Tags: MDM4U
https://pudding.cool/2017/05/song-repetition/index.html

Need an Ontario Math resource. Look no further than ontariomathedresources.ca Of course you can just go to the Edugains site but this new (or at least new to me) site is a bit nicer looking and simplified. A one stop shopping for some of the more popular topics. Thanks to Gisele Jobin for pointing this one out.
Curriculum Tags: All
http://ontariomathedresources.ca/

Some links are still coming in from OAME 2017. This time @rossisen takes a problem seen in one of @tomsteinke 's session and turns it into a dynamic web sketch. Click through on the blog to get to the dynamic sketch and explore.
Curriculum Tags: All

A pile of educators were at the RMS Symposium this week and @Pi_lab showed us this problem about a student's conjecture about area and perimeter. In this post @Rossisen extends the problem with some neat insights.
Curriculum Tags: All
http://mathfest.blogspot.ca/2017/05/exploring-area-and-perimeter.html

A few weeks ago I was looking for some good resources on representing dividing fractions and settled on using a "jump along" model. Eventually I'm probably going to make a websketch to model it but in the mean time @MsbJacobs has some insight into using concrete representations when dividing fractions.
Curriculum Tags: Gr7, Gr8
http://themathguy.blogspot.ca/2017/05/a-concrete-diagrammatic-symbolic.html

Here @mathgarden talks about the idea of resilience in students.
Curriculum Tags: All
https://medium.com/@sunilsingh_42118/mathematical-resilience-must-be-an-experience-before-it-can-be-an-expectation-6540e4412c06

@MrOrr_Geek did his Ignite session at OAME 2017 on why he is picky. He wants you to be too. Watch below and then go to the link for all the play by play.
Curriculum Tags: All
http://mrorr-isageek.com/being-picky-ignite-session-oame-2017/
Being Picky- OAME 2017 from Jon Orr on Vimeo.

I heard about @PaiMath's Ignite at OAME 2017 from other people and I am glad he's posted his video so we can all hear his poem "Be You"
Curriculum Tags: All

I love this reminder from @AlexOverwijk that manipulatives are OK in an assessment setting .
Curriculum Tags: All

I love this connection between Google searches in and around the Kentucky Derby
Curriculum Tags: MDM4U