To introduce the concept of comparative Pie Charts, I wanted to introduce the concept of linking the radius to the frequency, before they had to attempt exam style questions.
The worksheet gets them to find the radius first and then the missing frequency (be careful as they forget to square the radius). There is also a blank column either side so they can work out the area of each pie chart (in my lesson i added this task once they had done the radius and frequency, but it can be added beforehand)
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