Imagine a room full of toys — cars, dolls, balls, and blocks! How would you find out which toy is the most popular? You would count each type and write it down. This is called collecting data and it is the start of Data Handling.
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Key Concepts
Data: Information that we collect by counting, measuring, or observing. For example, the number of each type of toy in a box.
Tally Marks: We use tally marks to count and keep track of data. We draw lines (|) and every 5th mark is drawn across the four (||||). So |||| = 5.
Pictograph: A picture graph that uses pictures or symbols to show data. Each picture stands for a certain number of objects.
More and Fewer: After collecting data we can compare — which group has more? Which has fewer?
Most and Least: The group with the highest count is the MOST. The group with the lowest count is the LEAST.
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Worked Examples
Children in a class voted for their favourite toy. Cars: 6, Dolls: 4, Balls: 8. Which toy got the most votes?
Balls got 8 votes, which is the highest. Balls got the most votes.
Represent the number 7 using tally marks.
|||| || (5 + 2 = 7).
A pictograph shows: Apples = 3 pictures, Bananas = 5 pictures, Oranges = 2 pictures. How many fruits in all?
3 + 5 + 2 = 10 fruits in all.
Using the data from Example 3, which fruit is the least?
Oranges have only 2 pictures. Oranges are the least.
Count the tally marks and write the number: |||| |||.
5 + 3 = 8.
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Common mistakes
- Count tally marks carefully. The 5th mark crosses the four, so |||| = 5, NOT 4.
- In a pictograph, check if each symbol represents 1 or more items. Read the key carefully.
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Summary
Data handling means collecting, organising, and reading information. We use tally marks to count and pictographs to show data with pictures. We can compare data to find which group has the most or the least. This helps us answer questions and make good decisions!