Pie Chart construction and calculations

An introduction to pie charts and how they show relative proportions.

In this clip pie charts are introduced and an explanation is given to highlight that they show relative proportions.There are examples to demonstrate the usefulness of pie charts and how we have an intuitive visual understanding of simple fractions and proportions, which pie charts exploit. Numerically, the connection between fractions, decimals, percentages and the angles in a pie chart are explained. The end sketch demonstrates calculating a fraction of a fraction.

Teacher Notes

This clip could be used to revisit fractions, decimals and percentages. A pie chart with some missing information could be used as a starting point, from which to calculate unknowns. The end sketch (Fraction Karate) leads to calculating fractions of fractions, fractions of percentages, etc.

Curriculum Notes

These clips could be used for teaching Maths at KS2 or at a beginner level in England, Wales and Northern Ireland and 1st and 2nd Level in Scotland.