## Friday, 29 June 2018

### Desmos at Exeter 2018

I have had the pleasure of being part of the Exeter math conference again this year.

My slides for the CWiC session on "Getting the Most out of Desmos Activities"

Below are links to some of what we did in my two awesome classes.

Sunday
Intros with name tents - from Sara Van Der Werf; my modifications
Day 1 Activity Builder
Marbleslides Lines

Monday
Polygraph Lines
Parabola Slalom
Graphing Calculator scavenger hunt: original; beginner as AB
Geometry scavenger hunt
Marbleslides Challenges for the week

Tuesday
Domain & Range
Creating Desmos Activities - check out their videos here

Wednesday
Sean Sweeney's Marbleslides Activity & Google Doc Julie Reulbach's blog post on testing with Desmos
Jonathan Claydon's blog post on testing with Desmos

Thursday
Dynamic labels:

My activity for day 1 of Calculus

Friday

Our Google Doc of cool activities, including a bunch for geometry.

Thanks, everyone, for a great week!

## Thursday, 10 May 2018

### Teach Like Nat

At OAME 2018 I had the great pleasure of attending Nat Banting's session entitled "Teaching Mathematics with Open Tasks". The purpose of his presentation, in his own words, was to "build an understanding and appreciation of the interplay between constraints and freedom inherent in any task". Here is one of the tasks that he presented:

As we worked away and came up with our list Nat then said "Oh, I forgot to say that you can't use improper fractions." A few minutes later we were told that we couldn't use the same fraction twice, then later that we couldn't use equivalent fractions. Experiencing this as a student left me feeling like this:

But seeing Nat's teacher moves in action was remarkable. He looked at what each group had achieved and responded accordingly. His timing was perfect and he was a pro at not actually answering anyone's questions! I don't know who coined the term "facilitated chaos" but it is an apt description of the room during this type of task.

This was the kind of session that gets your brain going the more you think about it. And the more you think about it, the more connections you make which takes you deeper again. I'm not sure whether that makes any sense, but suffice it to say that it was great and has me excited to find way of incorporating this into my classroom on a regular basis. It didn't hurt that I was in a group with Sheri Walker, Fawn Nguyen and Jules Bonin-Ducharme and we laughed so much while having great mathematical discussions.

Nat's slides can be found here.

On the drive back to Ottawa, Sheri and I started brainstorming about how we could "teach like Nat". We are both currently teaching Calculus & Vectors so we came up with ideas that we could use in that course. Although we approached things differently - I had already taught cross product, whereas Sheri did this before teaching cross product - we both had very positive reactions.

Today was the day. My students sit in groups so I gave each group a whiteboard as their collaborative space. Here was the basic sequence I went through with my classes for the first challenge.

"Create two 3D vectors that are perpendicular to each other." I circulated and it was interesting to see their first responses. Most of them caused me to say "Oh, I forgot to tell you that you can't use 0." A few groans, but they carried on and came up with new vectors. Then I either said "Oh, you can't use the same number twice." or "Oh, you need to use integers." This eventually became "You must use integers from -9 to 9, but not 0, and they cannot be repeated." The next step was to make the sum of the magnitudes as large as possible. And each group genuinely felt like they could get the biggest magnitude. We had a list on the board of the current largest one. They were intensely engaged and oblivious to pretty much everything else going on. When things didn't work out, there was language used that was not appropriate but it was because they were so involved that they lost that filter. I overheard one student saying to a group mate "You're hella smart!" and another said "No, I won't let them win." No one was on their phone. No one was distracted. It was 100% engagement.

The second challenge (if they were willing to stop the first!) was to choose any two vectors and find a third vector that was perpendicular to both. I was astounded to see that some groups (of diligent, hard-working students) chose a hard path to figure this out because they actually didn't remember (know?) that this could be found simply using the cross product. (This was a good reminder for me - how often do they not learn what we teach?) They didn't even need me to restrict the constraints this time around - they did it themselves. Then I asked them to make the perpendicular vector have the largest magnitude possible. So far, I am winning this challenge, though I would not be surprised if someone comes in tomorrow with a bigger value.

Clearly, I loved this. But my students did too. When the bell rings and you hear "Why is class over?", you know it was a good class. So huge thank you to Nat and to Sheri. Speaking of Nat, he continues to inspire with tweets like this:

I want to do more of this! I would love to hear your ideas. We could get #teachlikeNat trending ;)

Oh - and you can all learn more from Nat in person at OAME 2019 in Ottawa. He is the latest addition to our list of Featured Speakers!

## Sunday, 6 May 2018

### TMC 2019!

We are looking for a host for next year's amazing Twitter Math Camp. Here is a little info about the conference from the tmathc.com website:

It all started in 2012 when 37 (?) brave teachers, who had never met except on Twitter, got together in St Louis to do math. I have had the good fortune to be part of TMC since 2013 and can't wait to see everyone in Cleveland this July!

This conference cannot happen without the generosity of the community. We need a location so if you want it to be near you (looking at you west coast folks!), then you need to help us out. Here are all the details.

### Strategies to Help Deepen Understanding in Senior Math - OAME 2018

Sheri Walker and I presented this session together on Thursday at OAME 2018. Just a note for non-Canadians reading this - we consider grades 9 & 10 as junior courses in secondary schools and grades 11 & 12 as senior courses in secondary school. So the focus of the session was on activities and questions that we would ask mostly in grade 11 Functions, grade 12 Advanced Functions and grade 12 Calculus & Vectors.

We started with this activity on domain and range using Desmos. It was originally created by Suzanne von Oy with subsequent edits by Cathy Yenca, Sheri and myself. We alluded to a list of other activities which are in the table below.

 To check for understanding / for review: To introduce a new topic: Which Form (quadratics) Sinusoidal Transformations (radians)

The second half of the session was centered around good questions that require our students to think and make connections. We created random groups of 3 and had each group work on the following two questions.

Question 1:

Extension: What if the last number must be a 9?

This came from Open Middle and was created by Kevin Rees.

Question 2:

Sheri came up with this question and we chose it because we loved the various ways that it could be started.

We also created a handout with a few more interesting questions. You can find that here.

There isn't a whole lot on them, but here are our slides. It was fantastic to have such great participation during the session - wish we could have kept going longer!

## Saturday, 5 May 2018

### Planting the Seeds of Change - OAME 2018

I was honoured to be invited to speak at OAME 2018 about how to move forward in your teaching practice. My talk was really an introduction to many of the great people in the #MTBoS whom I encourage you to get to know through Twitter or by reading their blogs.

Here is the link to my slides. The Marbleslides challenge is still open, if you want to give it a try. And here is a link to Sean Sweeney's blog post about his Marbleslide challenges.

Thanks so much to all those who came to my talk and participated. I hope you will all try one new thing and let us know how it goes!