First, we played Quadratic Headbanz, which I have blogged about here.

Given that 64 people had signed up for my session I had to make a second set of headbanz. As my original set featured equations I decided to make the second set with graphs which you can get here. As it turned out these ramped up the difficulty level for both the person wearing it and the person answering questions. This is a great activity with students and teachers, alike. It was especially good given that my session was right after lunch! It is fun, but gets at the vocabulary and skills you want students to know and each interaction can help struggling students get better at asking and answering questions. This is what it looked like:

Next I talked about warm-ups. This took a long time because there is so much good stuff out there to work with! I have blogged about warm-ups here and with my files, here.

I chose about a dozen or so people to do a counting circle. We started at 49 and counted down by 7. We talked strategy along the way and stopped so that they could figure out what we would be at 7 people along the circle and again shared strategies. I noted that you can do these with fractions and expressions, etc. They definitely help set the culture in my classroom where it's okay to make mistakes and we value each other's ideas.

I showed off Andrew Stadels' Estimation 180 site a little and I had participants estimate his height with reasoning. We also looked at this one together:

On to Visual Patterns. I love visual patterns. We do them every Wednesday and they take longer than some of the other warm-ups, but that is because there is so much rich math that can be drawn out of them. We did this one together:

We looked at the pattern in the number of black squares first, then looked at the number of white squares. I did not take a picture of what we came up with, so my challenge to you is to try to see how the white squares are growing in at least three different ways. You can check out my post here to see what I did with my students.

Next up: Always-Sometime-Never. Here is the one we did, which I showed without the "answer" first.

I really like how these push you to think further as you need to consider many cases.

We then talked about Math Talks and how good they are at helping students develop their number sense.

I then showed off the Solve Me site, which has lots of balance bender type questions.

I am working with my grade 10 applied students to have them solve these puzzles and then write down the algebraic equivalent. They need to make the connection and see that they are doing the algebra already, just in their head.

I also briefly mentioned and showed the Daily Desmos site which is filled with graphs that students need to try to recreate. The latest ones are all a little crazy, but if you search you can find simpler linear, quadratic and other more curriculum-aligned ones.

Then we got to have a little more fun with Which One Doesn't Belong?

I showed the logo you see above and asked which one didn't belong. Different people came up with a reason for each of the four not belonging, which is how all the sets on the WODB? site and designed. We then worked on the following incomplete set:

It was great to see groups trying to come up with a fourth graph that made this a solid WODB? set. There were several answers that groups created and the ones they found that turned out to not work generated some of the best conversations.

I think the vast majority of math teachers in Ontario have heard of and love Desmos. I wanted to highlight the fantastic activities that they have created. These go from linear to rational functions and truly engage students in meaningful mathematics.

I then provided "play time". Teachers could try one of the Desmos activities (I had codes for them to try four of the activities) or do any combination of the following activities. I will briefly describe each or provide links to blog posts. I feel that reading a blog post about the activity will give you more insight into what to expect if you choose to use the activity yourself.

**Speedy Squares**

Students first figured out how long it would take to build a 26 by 26 square out of linking cubes. They then used their times to figure out the relationship between number of blocks and time. They designed a simple house and calculated how long it would take to build it out of blocks, with a little help from the Lego My House app.

I blogged about it here and here.

**Barbie Bungee**

Let's give Barbie a thrilling bungee jump without letting her get hurt! Students develop a model and use it to determine the number of rubber bands needed for a particular height.

I blogged about it here and the handout is here.

**Matching: Linear & Quadratic**

This activity has students matching up word descriptions, algebraic expressions, tables of values and area models. I love this one - it comes from Shell Centre for Mathematical Education and is available here.

A brief blog post about it is here.

**Matching: Combined Functions**

This is an old OAME activity - I believe it starts on page 57 of this document. It is great for getting students thinking about combining functions in MHF4U.

**Cup Stacking:**

Students, using only 10 Styrofoam cups, determine the number of cups needed to reach their teacher's height. They can then find other relationships based on how they stack the cups and the types of cups used. They can solve systems of linear equations if you start one stack of cups higher than the other. Lots of good stuff in this one.

I blogged about it over several days starting here.

**Marble Roll:**

This is how I start my MPM2D course. Students have to find the relationship between the height of a ramp and how far a marble will roll from the base of the ramp. I haven't blogged about this one (!) so here is the handout.

**Tying Knots:**

Students first determine the relationship between the length of rope and the number of knots, then figure out how they can have the same number of knots in two ropes to produce the same length.

Since I don't seem to have blogged about this (yet), here is a link to Alex Overwijk's post and my handout (that needs work).

**Smarties:**

I started by looking at cost vs. mass for various sized boxes of Smarties, then cost per Smartie. On day 2, I explored the amount of air in a box of Smarties and have students construct their own box that will minimize the air (or maximize the Smarties, depending on how you look at it).

I blogged about it here and here.

**Intro to Calculus with Desmos:**

This was my day 1 challenge to my Calculus & Vectors classes. I blogged about it here.

**Log War:**

I don't have any recollection of whether I made these myself (they look like I did). I'm pretty sure I stole the idea from someone else - sorry I can't properly give credit. Here are the cards as pdf and doc.

It was fun to present to and work with such an enthusiastic group of math teachers. I hope you found something that will help you rethink your math class.

Thanks! What an incredible collection.

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