Parabolator: A quadratic sketching tool

Yesterday was the last day of our school year, so it's finally time to relax! And by relax, I mean write code. I was thinking about the tasks I want to set for next year, and wanted to find a tool to help create sketches of graphs. Not plots of…


I invented a new game for factoring quadratic trinomials over the summer break. After waiting to get to quadratics, I'm excited that this week I was finally able to play it with my Algebra 2 classes. As I was planning, I was thinking about how to motivate teaching factoring. In…

Building Equations... Again

I'm teaching again! There's so much that I can share about the start of my new job, but for now I just really want to blog about lesson ideas. So let's do that. In Geometry we're going through our introductory review unit. I wanted to see what my students' algebraic…

Order of Operations Posters

Next up in the back-to-school posterpalooza, it's the order of operations. I've heard different people have different opinions between GEMA and GEMDAS. I like the idea of arranging the letters like this as a compromise between the two. It emphasizes that multiplication/division and addition/subtraction occur in pairs, at…

Inequality Symbols Posters

Okay, before I go any further, I feel I should clarify: I have not just been working on posters for the last week, despite them completely taking over my blog. I have been working on lesson ideas, too. I just want actually try them out in class, so I can…

Converting Units Posters

I'm a Geometry teacher who doesn't know how to measure anything. Okay, I can measure stuff. But, like most of the world except the nation I now live in, I learned* to measure everything in metric. Mostly. I grew up on a farm, so I'm very used to measuring area…

Parent Functions Posters

New posters today for Algebra 2: Parent Functions! I actually put these up a couple of weeks ago, but unfortunately didn't have any photos of them. Then the floors of the school hallways got waxed and we weren't allowed in. Until today! Here's them next to my Geometry Symbols Posters.…

Geometry Symbols Posters

Firstly, my recent exciting news that I don't think I've blogged about yet: I have a job at the same school as my wife! :D I have my own classroom! This was in doubt for a while, as it seemed I might need to be a roaming teacher (which didn't…

Approximating Areas Interactive

Another coding project to share today: an online interactive for demonstrating the areas under a curve for a Riemann sum. I started work on this a couple of months ago, then forgot about it. I'm probably not teaching Calculus in the near future, so I lost some of my enthusiasm…

Geometry Units and Skills

First, the good news. I have a teaching job lined up for this August! While I can't go into details about it quite yet (partly because I'm not sure of some of the details myself), I'm pretty certain I'll be teaching Geometry some of the time. Having to start planning…


Shaun used to be maths, IT and ocassional physics teacher at a small P-12 school (primary and secondary) in rural Victoria, Australia. He is currently in the process of starting his career again in the United States.

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My journey from Australia to the United States:

Dropping the S

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Sarah is also a math teacher, and she's much better at this blogging thing than I am:

Math Equals Love

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