Charge! – Activity Makeover Series

Background. I’ll share an activity. Offer some ideas on what’s wrong. Invite you to share your own diagnosis/treatment. Then (end of week) share an upgraded version of the activity. (More details about this series are available here.) Activity and Diagnosis A couple years ago, I sat against the wall in my sons’ bedroom, taking screenshots of my smartphone once every …

Parallel Lines v2 – Activity Makeover Series


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(For the background on this series, go here.) On Monday, I shared an activity addressing slopes of parallel lines. Here’s the diagnosis. Here’s the original activity. As a quick recap, this activity does a poor job with at least two principles from the Desmos Activity Building Code: #4 – Create problematic activities. #5 – Give students opportunities to be right and wrong in different, …

Transformative Principal Podcast Appearance

A few weeks ago I had a conversation about what’s new and exciting in the world of Desmos with Jethro Jones, the principal of Kodiak Middle School in Kodiak, Alaska. He recently posted our conversation (in two parts) on his podcast, Transformative Principal. If you’re into that sort of thing, you can listen in here: Part 1 and Part 2 Enjoy!

ZPC Podcast Appearance

Earlier this week I gave a talk at the AIMS Center on using Desmos to facilitate classroom discussion around digital activities. While on campus, I stopped by their podcast booth for a 20-minute conversation with Chris Brownell. Dr. Brownell is the Director of Mathematics and STEM Education Programs at Fresno Pacific University—home of the AIMS Center—and also the host of the podcast Zone of …


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Points, Lines, and (Maybe Not) Inequalities


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One of the things I love about Twitter is the opportunity it provides for feedback on creative work. And thinking about teaching and learning mathematics is some of the most creative work I know. I’m still amazed when folks I’ve never met in real life take time out of their day to help me improve. Here’s a case in that beautiful point. Points, …


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Sliders with a Purpose


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Back in August 2015, Desmos released its Activity Builder, a tool by which teachers (and Desmos folks like myself) can build custom Desmos activities. Over the past few months, I’ve seen a number of Activity Builder screens like this: In fact, I’ve created a number of Activity Builder screens like that. However, I’ve also seen quite a few screens like …

Desmos Marbleslides


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This week, Desmos released a new activity called Marbleslides. As you might have heard (or seen), it’s delightful: Dan Meyer wrote about the activity on his blog, and our resident wordsmith dropped a marbleslides post on the official Desmos blog. [Psst: If you haven’t played yet, and want to… Go here.] In reflecting on what I love about marbleslides, my thoughts go back to the session Katie Reneau and I co-presented at this year’s …


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Hello Again (and Histograms)

Hi there! So I haven’t exactly been pumping out record numbers of blog posts since I shifted from the classroom to my current gig at Desmos. This lack of posts is partially related to general busyness, but it’s also related to this question that I’ve been wrestling with for the past few months: I’m not in the classroom, so… what would I even blog about? Over the past …


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A New Adventure

Friday marked the last day of my school year. More significantly, it marked the last day of my tenure at Fresno Christian Schools. After 11 years in the classroom, next year promises to look quite a bit different. This August I’ll join the Desmos team as a teaching faculty member, where I’ll help their already-amazing crew design activities for teacher.desmos.com. I’ll miss …

Polar Graphing Sorting Activity


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After an introduction and exploration (which I wrote about here and here) to my polar graphing unit, I wanted to steer our attention in a more algebraic direction so we could establish some connections between polar and Cartesian forms. On top of that, I needed an activity that would work well with a sub. The intersection of those wants and needs? A …

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