Bar Graphs

Class 6 Maths · Chapter 4: Data Handling and Presentation · NCERT Ganita Prakash section 4.3

Learn

When there is a lot of data, pictures take too long. A bar graph uses bars instead. Here: children who came late each day of one week. Wednesday had the most late arrivals; on Saturday nobody was late.

Bars have the same width and equal gaps. With big numbers we use a scale. Here 1 unit length = 100 visitors at a school science fair. The tallest bar, 11–12, shows 1,100 visitors.

We can also add and compare. From 10 to 12: 900 + 1,100 = 2,000 visitors. Why so few from 9 to 10? Many families had not arrived yet!

900 + 1,100 = 2,000

Explore: make the science fair bar graph. Drag each bar to the right height.

1. Set the bars: 9–10 250, 10–11 900, 11–12 1,100, 12–1 700.
2. Which hour had the second most visitors? Tap it.

Remember

• Bar graph: bars of equal width and equal gaps; the height shows the number.
• Read a bar by going straight across to the axis, and use the scale.

Quick check

Scale: 1 unit length = 100 visitors. A bar is 6 units tall. How many visitors?

1. 6
2. 60
3. 600
4. 6,000

Think about it

How many visitors came to the science fair from 9 to 1 in all?

Practice

Practise with fresh questions at three levels (easy, medium, hard), some answered hands-on, with hints and worked answers. Get 4 of your last 5 right to finish the topic.