NCERT Class 8 Mathematics Mathematics: Chapter 4 — Data Handling
Chapter 4 of the NCERT Class 8 Mathematics textbook, titled 'Data Handling', introduces students to the concept of data and its various representations. It explains that data is information collected in the context of a situation, such as student test scores or batsman's runs. The chapter revisits graphical representations of data learned in earlier classes, including Pictographs, where data is represented using symbols, and Bar Graphs, which use bars of uniform width proportional to values. It also introduces Double Bar Graphs for comparing two sets of data simultaneously. The chapter emphasizes how these graphical methods help in organizing, presenting, and interpreting information clearly, aiding in making informed conclusions and comparisons. This foundational understanding is crucial for further statistical analysis in mathematics.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 8 |
| Subject | Mathematics |
| Book | Mathematics |
| Chapter | Chapter 4 — Data Handling |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 2 minutes |
| Word count | 271 |
Learning outcomes
- Understand the definition and collection of data.
- Identify and interpret pictographs.
- Construct and interpret bar graphs.
- Understand the purpose and interpretation of double bar graphs.
- Analyze graphical representations of data to draw conclusions.
Vocabulary
| Word | Meaning |
|---|---|
| Data | Information collected in the context of a situation. |
| Pictograph | A pictorial representation of data using symbols. |
| Bar Graph | A display of information using bars of uniform width, their heights proportional to respective values. |
| Double Bar Graph | A bar graph showing two sets of data simultaneously for comparison. |
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Practice questions
- What is data? Answer: Data is information collected in the context of a situation that we want to study.
- What is a pictograph? Answer: A pictograph is a pictorial representation of data using symbols.
- What is a bar graph? Answer: A bar graph is a display of information using bars of uniform width, their heights being proportional to the respective values.
- When is a double bar graph useful? Answer: A double bar graph is useful for comparing two sets of data simultaneously.
Frequently asked questions
What is data in mathematics?
Data refers to facts and statistics collected together for reference or analysis, often in the context of a specific situation or study.
How is data represented graphically?
Data can be represented graphically using pictographs, bar graphs, and double bar graphs, which help in visualizing and understanding the information.
What is the advantage of using a bar graph?
A bar graph provides a clear visual representation of data, making it easy to compare values across different categories.
What is a double bar graph used for?
A double bar graph is used to compare two sets of data simultaneously, allowing for direct comparison between related information.
Can changing the order of bars in a bar graph alter the information?
No, changing the position of bars in a bar graph does not change the information conveyed, as the height of each bar still represents the same value.
Related resources
Important topics
Topics covered
NCERT Class 8 Mathematics — Mathematics — Chapter 4 — Data Handling. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.