Analyze Charts and Graphs
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Learning Objectives
- 1Read and interpret data from bar charts, line graphs, and pie charts
- 2Identify the title, axes, and key in a chart or graph
- 3Match each chart type to its best use case
Mini Lesson
Charts and graphs present data visually, making it easier to spot patterns, compare amounts, and track changes. Nonfiction texts often use them to support written information. Reading a chart carefully — its title, labels, and scale — is just as important as reading the words around it.
Common Chart and Graph Types
- Bar chart: compares amounts across different categories using rectangles of different heights.
- Line graph: shows how a value changes over time — great for spotting trends.
- Pie chart: shows how a whole is divided into parts — best for showing percentages.
- Table: organizes data into rows and columns for easy lookup.
How to Read a Chart
- Read the title to know what the chart is about.
- Check the axes labels (x-axis and y-axis) and the scale.
- Look at the key or legend if colors or patterns are used.
- Read the highest and lowest values; compare categories.
- Connect what the chart shows to the text around it.
Always check the scale on the y-axis. A scale that jumps by 100s looks very different from one that jumps by 10s, even if the bar heights look similar.
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