A blog about teaching and learning in a maths classroom.

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Bingo: Trig Exact Values (Radians)

Friday, 26 June 2015 | 0 Comments

I've had Make bingo for trig exact with radians on my To Do list for a while.

Over on MathsStarters Bingo, I've added a Trigonometry Exact Values (Radians) game. The degrees version has been there for a while.

MathsStarters Bingo screenshot

Students really like Bingo, so it's nice to have a game for seniors.

If you're not familiar with this game, students draw a 3 × 3 grid and fill it with 9 answers from the first screen of the game, e.g. from this game…

…a student's grid might look like this:

Example bingo student grid

Teacher presses Start, and the first question appears.

MathsStarters Bingo screenshot showing the question cos (4pi/3).

Our example student can cross of -½ (only once). The teacher can decide on the rule to win (e.g. first to complete a row, a column all their whole grid).

As always, feedback is welcome.

Percentages Foldable

Thursday, 07 May 2015 | 0 Comments

Percentages FoldableI recently made a Percentages Foldable (common percentages and their fraction and decimal equivalences) to include in our school newsletter. The idea was to encourage students (or parents) to make the foldable and put it on the fridge, or somewhere else prominent, to encourage the remembering of some common percentage comversions.

The foldable is downloadable (ready to print) from a special web-page I've created with the address:

On the web-page, there is also a short video instruction showing how to construct the foldable.


Please, feel free to include the link above in your school newsletter (maybe with a short blurb) or link to it on your school web-site.

Learn the common percentages from the comfort of your fridge!
Make this foldable, put it on the fridge with a magnet and test yourself to convert from percentages to fractions and decimals each time you open the fridge door.

Stamping Feedback

Friday, 24 April 2015 | 0 Comments

I found the previous stamps I had made so helpful that I got a few more made.

Feedback Stamps

(As you can see, a couple have a bit of blotchiness. I think this is because I've used quite small text on a small stamp.)

I used Vistaprint, who sell a small (36 × 12 mm) self-inking rubber stamp. I got them for $7.99 ea (through one of the regular discounts they have) plus $3.99 ea for colour (red or blue).

Below are the image files I used for the stamps above and from the previous post.

Stamp Originals zip, 97 KB
This work is licensed under a Creative Commons License (?).

Relative Frequency - Investigation

Thursday, 23 April 2015 | 0 Comments

Probability is one of those topics where it's best to "see it".

In this activity, students with a 6-sided dice choose the 'winner'. Then, 10 rolls at a time, they tally rolls and then calculate the relative frequency as a fraction and a decimal.


Relative Frequency - worksheet

They do this for 50 rolls. On the reverse, students graph results for their chosen dice. The graph includes a line for the theoretical probability.

A nice result would be when the resulting line trends towards the theoretical probability, of course that is not always going to happen - a great discussion point.

In the Excel file, there are three different simulations:

  • 50 rolls randomly generated - this could be used to show that there are lot of different ways the results might look, however many of then trend towards the theoretical line.
  • 50 rolls , manual entry - this could be used to record one set of results with the class to demonstrate the calculations
  • 1000 rolls randomly generated - shows the trend towards the theoretical line, usually

Relative Frequency - excel worksheet

Download the files here:

Growth Mindset. Yes, but…

Thursday, 09 April 2015 | 0 Comments

As I've thought about "Growth Mindset", see also Jo Boaler, I am convinced but then I head into class and walk out unconvinced. That disconnection is helpfully elaborated on in this blog post:

The Math Ceiling: Where’s your cognitive breaking point?

Math with Bad Drawings

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Simon Job — ninth year of teaching maths in a public high school in Western Sydney, Australia.
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