Conference Time!

If you haven’t picked up on this yet, I love math education. And while I love connecting with folks on Twitter and through blogs, conferences are the absolutely best. Hands down, no contest. I’m pretty pumped for this week. Here’s a few reasons why: NCTM in CA! I get to attend the biggest math conference in the land—in my home state! Desmos Happy Hour and …

Coin Combinations

Consider: What do you notice? My first observations included, “Hey! Sodas cost $1.50.” What do you wonder? The first thing I wondered was, “How many coin combos are possible?” And immediately after that, “Are pennies allowed?” (Check the picture for the answer.) And with my teacher hat on… “What strategies would other students and teachers use to answer the “how many combos” question? Sequel …

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Tesla Model 3

I’m fascinated by the pre-order hype surrounding Tesla’s latest car, the Model 3. Model 3 design sketches pic.twitter.com/P5ucOBRUZ7 — Elon Musk (@elonmusk) April 3, 2016 With a little help from Skitch, let’s turn this scenario into a math problem. Throw that image on the screen and ask students: How many orders in 24 hours? What info would help you figure that out? Ideally, after making some predictions (and …

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Cue Rockstar Math Edition

Last February I attended and presented at the CUE Rockstar event in Petaluma, CA. It was a blast. The only way it could have been any better was if it was 100% focused on math. (No offense other disciplines. Math is just my first love when it comes to teaching.) Well lo and behold, guess what’s coming up on May 14-15?! An all-math CUE Rockstar! And check out …

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Points, Lines, and (Maybe Not) Inequalities

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

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 …

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The famously difficult green-eyed logic puzzle

Last Monday I wrote about a riddle involving a bridge, some folks of various bridge-crossing abilities, and a horde of slow-but-blood-thirsty zombies. Well, Alex Gendler, I’m hooked. I love a good logic problem, and the presentation of these riddles—specifically, the animation and narration—is simply outstanding. And since I’m hooked, I thought I’d share another in case you’re in (or want to be in) the same …

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Can you solve the bridge riddle? (Zombies!)

Last weekend I was at the Interface conference in Osage Beach, MO. While attending a session on Saturday morning, a fellow participant shared this lovely problem with me. (WARNING: The video poses the problem and solves it. Be sure to stop in the middle so you can give it a try for yourself. It’s way more fun that way. I promise.) It took me a little …

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How Many Solutions?

I’ve been thinking about systems of linear equations for the past couple of days. Most of my focus has been on systems of two equations, but this morning I wrote a question about a system of three linear equations that might spark some interesting and revealing classroom conversations: And now I’m wondering… How many solutions does that system have? Drop your thoughts in the comments, would you? …

Resource Countdown • December 24, 2015

For a tiny bit of background, check out last week’s inaugural “resource” post. Now, on to the countdown! 3… Tweets What's more exciting than Math on a Stick? Hearing @maxmathforum + @mfannie recount how it all began. #nctmregionals https://t.co/G67QXVLk8Q — The Math Forum (@themathforum) December 21, 2015 Look what my principal got me for the holidays! #GotMePegged #MTBoS cc: @Gelada @alexbellos …