Ch 4 of Ganita Prakash covers Data Handling and Presentation — the process of collecting, organising, representing, and interpreting information. In our daily lives, we encounter data everywhere — weather reports, sports scores, election results. This chapter teaches students how to make sense of all this data using tools like tally marks, pictographs, and bar graphs.
Data is a collection of information in the form of numbers or words. To collect data, we can use surveys, observations, or experiments. Recording data systematically is important — tally marks are a quick way to count occurrences. In tally marks, every fifth mark crosses the previous four (||||), making it easy to count in groups of five.
Raw data can be difficult to understand. Organising data into tables or frequency distributions makes it easier to analyse. A frequency table lists each item and how many times it occurs. Grouping data into categories helps identify patterns and trends quickly.
A pictograph uses pictures or symbols to represent data. Each symbol represents a fixed number of items (the scale). For example, if one 🍎 represents 5 apples, then 3 🍎 symbols represent 15 apples. Pictographs are visually appealing and easy to understand at a glance.
A bar graph uses rectangular bars of uniform width to represent data. The height (or length) of each bar corresponds to the value it represents. Bar graphs have two axes — one for categories and one for values. They make it easy to compare different quantities and spot the highest and lowest values.
Reading and interpreting graphs correctly is a key skill. Students learn to extract information from pictographs and bar graphs: which item has the highest frequency, which has the lowest, what is the total, and what is the difference between two values. Drawing conclusions from data develops analytical thinking.
Download the official NCERT PDF for Ch 4 "Data Handling and Presentation" from the NCERT website: https://ncert.nic.in/textbook/pdf/fegp104.pdf. You can also download the complete Ganita Prakash textbook: https://ncert.nic.in/textbook/pdf/fegp1ps.zip
A pictograph uses pictures or symbols to represent data, while a bar graph uses rectangular bars of varying heights. Bar graphs are more precise and can represent exact values easily, while pictographs are more visually engaging but less precise when dealing with values that are not exact multiples of the scale.
In a pictograph, the scale tells you how many items each symbol represents. For example, if one symbol represents 5 students, then the scale is 1 symbol = 5 students. Choosing the right scale is important for making the pictograph readable.
To read a bar graph: identify the categories on one axis and the scale on the other. The height or length of each bar shows the value for that category. You can compare bars to find which category has the highest or lowest value.
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