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    • Number and Proportion
    • Algebra
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Teaching Pythagoras' theorem

31/3/2015

 
I absolutely love teaching Pythagoras' theorem - not sure why, but I suspect it has something to do with the sense of "wow" I got when I first learned about it and realised that maths isn't all about doing sums. There's loads of really interesting stuff you can do with it, and as the first real theorem that most pupils will meet, I think it's worth doing it justice.

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Teaching rounding

24/3/2015

 
1. Crack place value first
This might seem like a no-brainer, but teaching rounding on top of an insecure understanding of place value is a recipe for disaster. Before pupils can get their heads around rounding, particularly to a given number of decimal places, they need to understand why 0.43 is bigger than 0.413, otherwise the whole thing's a write-off.
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Rounding using a number line

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Comic strips for KS3 and GCSE (Percentages)

22/3/2015

 
Following my trawl through the xkcd archives to find my favourite comics for A Level, I thought I may as well post some that may be relevant for KS3 and GCSE. There are plenty of funny graphs and pie charts (great for the last five minutes of a lesson), and a few topic-related strips.

This post contains a few percentages comics; while they're quite funny, they also have quite a bit of mileage in terms of mathematical discussion, particularly "Hand Sanitizer" and "Fastest Growing".

Clicking on each picture will take you to the xkcd site, where you can get larger resolution versions.

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xkcd strips for A Level

22/3/2015

 
If you haven't heard of xkcd (click now and lose three hours), it's a webcomic run by Randall Monroe focusing on maths, science and computing. Although some of his comics (mostly the coding ones) go over my head, the maths-based ones are hilarious, and some are great for sharing in lessons - with the caveat that some do contain naughty jokes, so check first. Here's my pick of a few particularly relevant to the A Level syllabus:

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Pick of Twitter 21/03/15

21/3/2015

 
Predictably, lots of the blog posts I've read this week have been about the third Maths Conference last Saturday. Having said that, it's great to read other people's perspectives and get an idea of what went on in all the workshops I didn't attend. Here's a few I've enjoyed:
  • @BodliUK ~ 3 Techniques You Should Know, Mastery Assessment and Tricks and Tips.
  • @DrBennison ~ Sticky Studying, Johnny Ball, Tricks and Tips.
  • @Just_Maths ~ Interesting thoughts about thinking critically about teaching techniques.
  • @naveenfrizvi ~ 3 Techniques, The Hows and Whys of how and why, Bar Modelling.
  • @mathsjem ~ First blog post about her Tricks and Tips session with all the notes.
  • @workedgechaos ~ Full summary of the day; his report on the Great Mastery Debate is really worth reading.

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From bar modelling to ratio tables - tidying up percentages

20/3/2015

 
It's no secret that I'm a big fan of bar modelling to get pupils to really think about the calculations they are doing. It's a great way to introduce work with percentages too, and solidifies the link between percentage and fraction calculations. One particular advantage is the flexibility it affords - I had one pupil decide that the best way for her to find 15% was to work out 25% and 10%, then subtract one from the other, rather than the more "traditional" method we'd probably all teach of finding 10% and 5%, then adding together.

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Mix Match

19/3/2015

 
A great quick activity to get pupils out of their seats; this works particularly well at the end of a lesson for an exit activity and can be used for most topics.
Prepare a set of cards before the lesson; I usually make simple pairs, but sets of 3 can also work quite well. 
Give each pupil a card and ask them to find their partner(s). I deliberately choose very similar examples so that pupils have to think carefully about their answers rather than just looking for someone with "matching" numbers. 
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Use similar examples to prevent guessing.

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Pass the Problem

18/3/2015

 
This is a great way to get pupils collaborating in the classroom and focusing on the steps to solve problems. 
Put pupils into groups of four, then distribute four problems. Each pupil solves a step before passing to the left and so on, until each problem has a complete solution. 

This works well for simple practise or working on exam technique for longer problems, as it encourages clarity in working out. It also allows lots of time for peer support, so could be done with a pair of higher-attaining and lower-attaining pupils per group.

  • Browse my Pass the Problem collection
  • Find out about password access
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Teaching solving equations

17/3/2015

 
The teaching methods I use for solving equations have changed drastically over my (relatively short) career so far, so here's a post about my journey so far and current "tried and tested" ideas.
1. Why animal algebra doesn't work
One very clear memory I have of my time at school is the first term of work I did in Year 7. My teacher was properly "old-school" - he'd demonstrate for 15 minutes, then we'd work in silence for the remaining 45 minutes on similar problems. He was the deputy head, and we were all pretty terrified of him; while I don't want to debate if that's a good teaching model or not, one thing that really stuck with me was that first term's work - we did nothing but solving equations, pretty much from September until Christmas. It wasn't just simple linear though; we went all the way to solving quadratics using the formula, although I confess I didn't really know what I was doing or why I was doing it. As a result, I've always loved algebra and been pretty good at it (conversely, my geometrical reasoning skills are pretty dire). 

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Solving linear equations using algebra tiles

17/3/2015

 
By the time I teach linear equations, I've already used algebra tiles quite a lot with pupils to create algebraic expressions. After working through one-step equations and ensuring pupils understand the processes involved (rather than just solving "by eye"), I move on to linear equations. 

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What's occuring?

16/3/2015

 
Since my last update, the following things have happened:

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Factorising linear expressions using algebra tiles

15/3/2015

 
Not sure what algebra tiles are? Start here:
Why algebra tiles are the most amazing thing, like, ever

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What did you do for Pi Day this year?

14/3/2015

 

6:45am

Alarm goes off. Contemplate turning it off and going back to sleep - it is a Saturday after all. Somehow remove myself from bed and into shower.

7:15am

Showered and eating breakfast. Dad decides to start an in-depth conversation about learning maths and nearly makes me late! I don't get to see my parents too often so it was nice to pop down for the evening before - as they live in Wolverhampton it seemed like a no-brainer to start my journey from there rather than Leeds.

8:10am

Mum has made me tea in my flask <3 Get in the car and set off for Birmingham!

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Completing the square using algebra tiles

12/3/2015

 
This was the first lesson I taught using algebra tiles (you can find out about them here) and it's my go-to way to introduce completing the square now. It's worth starting with a little work on factorising first, just so you don't completely blow their minds.

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Why algebra tiles are the most amazing thing, like, ever

12/3/2015

 
I discovered algebra tiles last year when, in a fit of desperation, I took to the Internet to find a good way of teaching completing the square in a way that might actually get it to stick in the heads of my Year 11s. 

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Meaningful feedback on past papers

11/3/2015

 
Part of tonight's #mathschat got me thinking about strategies I use for speeding up marking and giving useful feedback. I used to create RAG sheets and fill in by hand, but I've gradually automated the process to a quick Excel spreadsheet - just fill in the marks per question and RAG sheets are auto-filled for pupils. Although initially time-consuming, now I've done a couple, it's much quicker when returning to past papers.

I'm putting them up on the site over the next few months - if you want the ones I've uploaded so far, you can download them here. You can find password access instructions here.

Discovering pi

11/3/2015

 
As Pi Day rolls round again, I've pinched one of my colleague's "Pi Kits" and have now done this lesson with Year 7, 8 and 9 this week. It's my favourite way of teaching circumference and area of a circle, both the first time pupils encounter it and as a reminder before teaching any new circle topics. I'm surprised that some pupils have often come across pi prior to this lesson, or can even quote the formulae for circumference and area, but have almost no understanding of what it is and why it's so fundamentally important in circles.

I changed things a bit this year; usually I just investigate circumference and diameter, then do a bit of bluffing about how pi miraculously "pops up" in the area formula too. However, I extended my investigation this year to include area for some groups, and it worked really well.
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Introducing pie charts using the average day

10/3/2015

 
This was one of the first lessons I wrote in the first year of my teaching career, and is still one of my favourite ways to introduce pie charts. There's also loads of scope for adding extra stuff in, such as work on fractions and percentages if appropriate for the group.

Pupils begin by thinking of the activities that make up their average day, and use a 24-sector pie chart template to colour-code this. They then look at the fractions of their day spent on various activities. Using a life expectancy of 80 years, they then calculate how many years they spend in total over one lifetime on each activity. To finish off, I've recently added this video to the end of the lesson, which looks at representing the average life as a pile of jelly beans.
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Introducing fraction arithmetic (2)

8/3/2015

 
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This is part of a series of blogs on my favourite way to teach adding and subtracting fractions in a way that sticks and really develops understanding of the process. If you haven't already done so, you can read about Lesson 1 here.
Lesson 2 - The importance of equal-sized bars

At the start of the next lesson, present pupils with two more sets of data, this time comparing two groups of unequal size. Using group sizes of 20 and 30 are particularly effective.
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I usually get the class to first represent both sets of data on two more bar diagrams using the template from the previous lesson and get them to record the fractions of Year 8s and 9s that preferred each fruit, cancelling down to the simplest form.
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Introducing fraction arithmetic (1)

8/3/2015

 
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The lesson(s) detailed below have been absolutely groundbreaking for me in terms of teaching adding and subtracting fractions in a way that makes the topic stick and that pupils really understand. The ideas behind it were introduced to me as part of the NCETM's Multiplicative Reasoning course (previously mentioned in my blog about bar modelling). Unfortunately, while I have the lesson materials, I'm still unsure about their status in terms of sharing - they were presented to us as trial materials, with the suggestion that they would be available to schools nationwide once the project had finished, but I can't find them anywhere on the NCETM's website (yet). So although I can't post a link to the PowerPoint and lesson materials I'm using, I thought I'd pop up a quick blog about the ideas behind the materials.

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