When we collect information and write it down, we are collecting data. For example, counting how many children like apples, mangoes, or bananas is collecting data. Data handling helps us organise, read, and understand information easily.
What is Data?
Data is a collection of facts or numbers that gives us information.
Example: The colours of cars in a parking lot.
Tally Marks
Tally marks help us count quickly:
- I = 1, II = 2, III = 3, IIII = 4, IIII (crossed) = 5.
We cross the 5th tally mark to make groups of 5 easy to count.
Pictograph
- A pictograph uses pictures or symbols to show information.
- Each picture stands for a certain number of things.
- The key tells us what one picture stands for.
Bar Graph (Simple)
A bar graph uses bars of different heights/lengths to show data. Longer bars mean larger numbers.
Reading Data
- To read a pictograph or table, we look at each row and count the symbols or numbers carefully. Then we can answer questions like:
- Which group has the most?
- Which group has the least?
- How many more in one group than another?
In a class, 6 children like apples and 4 like bananas. Draw a tally for each.
Apples: IIII I (6 tallies). Bananas: IIII (4 tallies).
Answer: The tally shows apples are more popular.
A pictograph shows that 1 star = 2 books. Rama has 4 stars. How many books does Rama have?
Step 1: 4 stars x 2 books each = 8 books.
Answer: Rama has 8 books.
In a survey, 5 children chose red, 3 chose blue, and 7 chose yellow. Which colour is most popular?
Step 1: Compare: Red = 5, Blue = 3, Yellow = 7.
Step 2: 7 is the largest number.
Answer: Yellow is the most popular colour.
Using the same survey above, how many more children chose yellow than blue?
Step 1: 7 - 3 = 4.
Answer: 4 more children chose yellow than blue.
A pictograph uses 1 flower = 5 plants. If Anita shows 3 flowers, how many plants does she have?
Step 1: 3 x 5 = 15 plants.
Answer: Anita has 15 plants.
Key Points
- Data = collected facts or numbers.
- Tally marks: group in fives for easy counting.
- Pictograph: each symbol stands for a number (check the key).
- Always read the key in a pictograph before answering.
Common mistakes
In a pictograph, always check what one picture stands for. Do not assume each picture = 1 unless the key says so. Also, count tally marks carefully — every 5 is shown as a group.
Summary
Data handling means collecting, organising, and reading information. Tally marks and pictographs are easy ways to show data. We compare data to find the most, least, or difference between groups.