Desmos: Dot Capture Game


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I created a silly little game for my Algebra 1 students several weeks ago. The motivation? Five-fold! We’re a little weak with graphing lines. Some open-ended, Desmos-driven, instant-feedback style practice may help. Domain and range? Yeah, not so much. Inequalities? Haven’t done them justice. Yet. (Growth mindset, baby!) Vertex form for quadratics? Still struggling. We tried Des-man a few days before this game …


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All Mistakes Are Created Equal?


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Preamble I’m a big fan of Michael Pershan’s project Math Mistakes. If you’ve never checked it out, it’s worth exploring. And while I’m meddling with your life, here’s a tip for your entire department: Start each meeting by spending five minutes exploring one of the mistakes posted on Michael’s site. On a rotating basis, have one member of the department share a “provocative” math mistake from the …

Desmos Hack: One-Variable Inequalities


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I was typing out solutions to an Algebra 2 assessment the other day. Question 3 on the assessment asks students to solve an equation involving absolute value. I began my solution with this… …and then launched into an algebraic confirmation of that solution. Now on the one hand, throwing a Desmos-generated graph into a “detailed solutions” handout is a great move because, well, just look at it. It’s beautiful. …


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Quadratics Matching Activity, Take 2

Visitors and Commenters? Woohoo! I’m amazed anyone reads this blog, and even more blown away that people have posted so many thoughtful comments. Shortly after my long-winded sky-is-falling post, I added a quick note about launching an activity with as few words as possible. There were a few great comments on this shorter post about how to improve one particular …