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 the same time, but students will hopefully not forget about the division and subtraction.

Sarah designed the Grouping Symbols poster. I thought it’d be nice to have my order of operations posters match her style.


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 reflect on how they went, before they make it to the blog.

Anyway, for today, another poster set: Inequality Symbols!

I guess equals is there too. But I thought “Inequality Symbols (and equals is there too)” wasn’t a very succinct title, so there you go.

I was very tempted to redo these bigger, with a single symbol to a page. If you think that would look better, you have my blessing to change it. 🙂

The prime numbers next to it are courtesy of my wife. In this case, I didn’t even need to print and laminate them myself. Sarah came into my room with an extra set she made for a reason she can’t remember. They’re designed to be one long column, but I thought I’d better at least contribute a little creativity to them in my room.

As always, downloads are PDF and the original editable format. Font is Marvel.

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 in acres and rainfall in points and inches. But aside from that, I just know metric.

So this poster set is for me, more than the kids, if I’m perfectly honest. Or it is for them, when Mr. Carter is silly enough to give them all their measurements in millimeters.


Fonts are ChunkFive and Patrick Hand.

* I also had to fix this word after typing “learnt” just now. It’s going to take a while to break some of these habits.

Classroom Rules Posters

This tweet basically summarizes what the last week has been like in our house:

The latest contribution for my walls are my classroom rules:

These basically are a slightly revised version of my rules from last year. You can download the posters here:

The fonts are Archistico and Coming Soon.

Algebra 2 Units and Skills

New standards means new plans. Except I’ve only just moved to Oklahoma, so I’m teaching Algebra 2 for the first time anyway. Good timing, I guess?

Anyway, I’ll be using SBG this year. Here you’ll find my complete list of units, containing the relevant OK math standards and ‘Critical Gaps’, along with my SBG skills lists.


I’ve already shared my Geometry units and SBG skills list for this year.

Planning Geometry Notes

I’ll be teaching Geometry for the first time this year. Actually, everything is for the first time this year, as I’ve never taught discrete high school math subjects before*. It feels like I’m starting from scratch with my planning.

I’ve already posted my list of Geometry units and skills, mapped to the new math standards that Oklahoma is introducing. (I’ve done my Algebra 2 units too. I really need to get around to posting those.) Recently, I’ve been working on filling out a bit more of the details of what I’ll be teaching. I don’t plan on making too much use of the textbook, but I still want a list of the definitions, postulates and theorems written out. So, that meant making the list myself.


To be clear, this is not a document I’m giving to my students. This is for me, to make sure that my students are getting all the background knowledge they need as we progress through the course. There are still the day-to-day decisions about how I’m going to introduce these concepts in class, and how we will take INB notes each definition and theorem. I am very keen, though, to have students proven many, if not most, of these theorems themselves.

I’m considering this a first draft. I tried my hardest to make sure that everything that needs to be there is, but I’m not guaranteeing it. I would love feedback about anything, whether something could be worded a little more clearly, or there’s a giant hole of content that I’ve missed completely. I know I’ll be revising this document throughout the year.

* You could read this post and change every ‘UK’ or ‘Britain’ to ‘Australia’ and get a pretty good idea of what I’m used to.

Perfect Cubes Images

You may have seen Sarah’s recent post about making posters of perfect square and cube numbers. She was talking to me about how she would go making the cubes. I thought about it for a bit, and thought there must be some way to do it in Geogebra. Turns out, there is!

Drag that slider, and you can change the number of cubes from 1³ to 20³.

This took a little bit of messing around to get right, mostly because I’ve never used the spreadsheet view in Geogebra before. Once I worked out that spreadsheet cells can contain graphical elements that get displayed, it was just a matter of plugging in the right formulas to generate all the lines.

Anyway, if you’d find this useful, you can download the file here:

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! 😀
  • 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 bother me that much, because we all had to roam when I was in Australia.) But people got shifted around, and it turned out there was a room free.
  • My teaching certification for Oklahoma finally came through last week!

The result of all that is that I’m teaching Geometry and Algebra 2 next year, and I have an empty classroom with no posters. Well, had an empty classroom. I’m working on that. 🙂

Here’s my set of Geometry Symbols posters. Sorry about the glare. I’ve never taught “Geometry” as a single subject before. In Australia, maths is still integrated through high school, so there’s just a little bit of geometry each year. So I found it very useful going through the units I have planned, figuring out what specialized symbols students will need to learn to take Geometry as a class. And putting them onto posters helps add a bit more color to my room.

Downloads are here:

Font is Arvo.























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 for completing all the ideas for this project. But given the work I’d already put into it, I thought it would be worth sharing what I’ve got anyway.

You can find it here: http://www.primefactorisation.com/areaapprox/

I might come back to this at some point. Let me know if you’ve got any suggestions, or any functions you’d really like me to add to it.

I’ve also done this concept as an activity involving cutting and pasting.