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Make your students' understanding of ratio, proportion and rates of change improve tenfold with these activities, ideas and lesson plans
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For a good place to start, or for students to revisit, for some basic definitions, this BBC Bitesize page includes:
Or you can just check out the entire thing here.
This video provides a neat overview to calculating scale factors.
Check out the video and accompanying notes here.
For a more in-depth look this video walks students through the idea of enlarging a shape from a centre of enlargement.
Watch it here.
In this lesson, students are asked to decide where the centre of enlargement can go for a given shape with a scale factor of 3 enlargement so that no part of the image will go off the edge of the grid.
Solving this problem involves students in intelligent trial and error as they experiment with various possible centres of enlargement in order to locate the locus of possible positions.
Download this free Colin Foster lesson plan here.
This NRICH activity gets students to consider scale factor enlargements for rectangles, before moving on to other 2D shapes, and then 3-dimensional ones.
Other scale factor activities include ...Who is the fairest of them all? and Matter of Scale should students want more of a challenge.
First, give Growing Rectangles a go here.
As the title of the video suggests, this is a short clip that shows students how to calculate the scale factor of two shapes. It’s a handy one to refer to should they need it.
Watch the video above, or find it here.
If you’re after some printable worksheets, these ones from Mathster should do the trick. Not only are they free, but there’s a regular version and an advanced one too.
Print out the standard version here.
This handy site throws up 10 questions for students to answer on scale factor, and they can check their answers there and then.
Better yet, want more questions? Just hit the new worksheet button and it’ll provide you with 10 more.
Give it a try here.
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