##### Direct Proportion (and being a Gem)

A really simple PowerPoint covering direct proportion. I’ve deliberately left context out of it here and focused on questions that ask you to use the formula. There’s some example problem pairs and some exercises. Gotta say, I love a good fill in the blanks question. Makes you think forwards and back.

I’ve included examples here with a negative proportionality constant. Twitter was pretty unanimous that this was OK.

If you disagree, tweet at me!

In other news : I got mentioned in Jo Morgan’s end of year ‘gem’ awards. What an honour!

I won the ‘Hidden Gem’ award. As always, there’s an open offer here. If you want to host any of this stuff, or help it reach a bigger audience (or have feedback as to why it doesn’t), please contact me.

Next time : Indirect proportion.

Trying to get back into the swing of things.

I use grid method to do this. I’m a big proponent of grid. Reading through Jo Morgan’s amazing Compendium of Mathematical methods, there’s loads of approaches. But I like to use grid for everything.

I’ve also updated my expanding double brackets and using the quadratic formula PowerPoints. They’re now simpler, have different questions and just feel a lot more airy and bright.

As always, tweet me @ticktockmaths for any feedback or questions. I love a good tweet.

##### Estimating the mean from a grouped frequency table

Starts with a little task on finding the midpoint. I often find this trips students up more than you would think.

Moves onto some example problem pairs and then a very (overly?) structured worksheet.

Then some questions that I wrote that I really like.

And then… that’s it. This filled the lesson nicely and I really didn’t feel like I needed much else.

Maybe I could have done a section where the mean is given but there is a hidden frequency, but I didn’t want to be overly prescriptive.

##### Rearranging equations / Changing the subject

I never know what to call this topic.

I’ve broken it down into two PowerPoints and I have run it for my year 9s over 3/4 lessons. The first PowerPoint is the better one.

There’s a focus on what it means for something to BE the subject. When I used these slides this week, these questions generated the best discussion and revealed some misconceptions I didn’t really think would be there. A significant number of the class thought 2a was fine as the subject of an equation.

Not to blow my own trumpet. but I think the questions where students have to identify if the first step was good or not was also a great conversation driver. I love this idea of just looking at the first step.

The second PowerPoint is much more boring. It’s a few example problem pairs and a few questions looking at more difficult rearrangements, where you need to factorise.

I’m sure you could jazz this up a little bit, but I really think this is challenging enough for students, and needs to be given detailed, close attention.

As always, review these on TES if you liked them or used them. Follow me on Twitter etc. All that stuff does make a difference, as sad as that is.

##### Updated resource and some misconception chat : Significant Figures

I’ve been busy touching up some resources when I teach with them, and adding them to TES.

Significant Figures : I updated this resource with a much greater emphasis on counting the significant figures before doing any rounding.

I did this after having a bit of nightmare with my year 7 class teaching rounding.

If you collect misconceptions, though, look at this that came up

##### Rationalising the denominator

Thanks to @mathsiskind on Twitter for pointing out that I nearly uploaded this resource with ‘rationalising’ spelt wrong every time.

I am really liking forwards/backwards activities at the moment. Fill in the gaps etc. They can be great for a bit of scaffolding.

Not much else to say about this. Get in contact on Twitter @ticktockmaths if you spot any errors that need correcting, and if you use and like the resource, leave me a review on TES. It really does make a difference to know if people are actually using these slides.

##### Surds and brackets

Pretty simple stuff. But I’ve tried to add a bit of backwards/forwards thinking here.

I might even do rationalising next week. (I’m teaching this topic at the moment but I don’t always upload the slides I teach as they’re not 100% complete a lot of the time). That will mean the surds topic is DONE, though. And I like the idea of complete topics.

There isn’t much here. I was just trying to explicitly teach something I often leave in passing. (ie that surd addition works like collecting any other like term).

Not a full lesson. Just maybe an activity to throw in.

##### Simplifying Surds

I created this for my class. There’s quite a lot here.

A starter, some example problem pairs, some activities etc. The usual.

The main activity is a total rip off of an activity I saw on Jo Morgan’s resourceaholic, though (although there’s a strong argument to be made that the activity there is better). I love how Jo points out the simple things. I am loving forwards-backwards worksheets at the moment. They force pupils to make decisions and get rid of that automatic thinking they can slip into where they are doing, but not thinking.

I also stole the ‘what is a surd’ intro from a Mr Barton session. It’s always important, I think, to be strict with your definitions. I had a bit of a nightmare today because I tried to teach significant figures, without defining what a significant figure was. A bit of thinking needed there…

You probably need to add a bit more practice to this lesson, but that’s where those websites that can generate a trillion random questions come in. I don’t just use these PowerPoints to teach, they are just a useful basis and structure.