Split the whole into equal parts: find one part first, then scale up.
Fractions and Ratio: Pie Charts
Methods in this video
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- 1
The whole circle is 1: one slice links its fraction, angle and amount
When to use it: A pie chart shows a whole. Read fractions, percentages, angles or equal angle steps to find an amount, total or missing sector. You may need to choose a matching chart or redraw after removing a category.
- Name the current whole. A full circle is 360 degrees or 100 percent. A right angle is one quarter. Removing a category changes the total.
- The same share links an angle and an amount. Use a known sector to find one part, the total or another sector.
- Subtract known sectors for a missing share. Check every condition and use a different sector for each category.
Practise exam-style questions with these methods
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