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🥧 Pie Charts and Line Graphs

Construct pie charts by calculating sector angles, build line graphs from data, and read both to spot trends and solve problems.

3
lessons
~15 min
to learn
🔢 Math
subject
Ages 6–12
level
Start the course →

What you’ll learn

  1. Pie Charts: Parts of a WholeRead a pie chart and compare the sizes of its slices.A pie chart is a circle divided into slices, each a part of the whole. Bigger slices mean bigger shares, and all slices together make 100%. Reading a pie chart means comparing slice sizes to see which category is largest and by how much.
  2. Building a Pie ChartConstruct a pie chart by calculating each sector's angle.To build a pie chart, share out the 360° of a full circle: each category's angle is its fraction of the total multiplied by 360°. If 10 of 30 children chose pizza, that is a third, so the slice is 120°. A protractor then draws each angle.
  3. Line Graphs and TrendsRead a line graph and identify its trend, and choose the right chart.Line graphs show change over time, and the direction of the line is its trend — rising, falling, or flat. Choosing a chart depends on the question: pie charts for parts of a whole, line graphs for change over time.

Questions this course answers

On a pie chart, a bigger slice means:

A larger slice takes up more of the circle, so it is a bigger share.

A full circle for a pie chart is:

A complete circle contains 360 degrees, shared among the slices.

A line graph is the best choice for showing:

Line graphs reveal how a value changes over time — its trend.

Ice-cream sales rise toward summer then fall. This shape is called a:

The overall direction of a line graph is its trend.

To show what fraction of a budget goes on each item, use a:

Pie charts show parts of a whole, like a budget split.

Grounded in trusted sources

  • BBC Bitesize — Maths
  • Khan Academy — Math
  • NCTM — Illuminations

Every Wunder lesson is built from real, reputable sources — never invented.

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