Lesson Notes By Weeks and Term v5 - Grade 4

Lesson Video

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Performance objectives

• Collect data using tally marks and surveys.
• Organise data into tables.
• Represent data using pictograms and bar graphs.
• Interpret information from these charts.
• Answer questions based on the data.

Lesson summary

Data handling is all about collecting information, organizing it, and presenting it in a way that makes it easy to understand. Imagine you want to know which is the most popular sport in your class or how many learners walk to school versus taking the bus. Data handling helps us answer these questions by collecting the information (data), putting it in order (organizing), and showing it using pictures or charts (representing). This is useful in everyday life, from knowing what snacks to buy for a party to understanding news reports.

Lesson notes

What is Data? Data is information, facts, or figures. It can be about anything!

Examples of data include: favourite colours, types of pets, number of siblings, heights of learners, or the amount of rainfall in a month.

Collecting Data: We collect data in different ways. One easy way is to ask questions (a survey). Another way is to observe and count things.

Surveys: Asking people questions to gather information.

Example: "What is your favourite fruit?" Observation: Watching and recording what you see.

Example: Counting the number of red cars that pass by in 10 minutes.

Tally Marks: A simple way to record counts. Each group of five tally marks is shown as four vertical lines and one diagonal line crossing them (||||). This makes it easy to count in groups of five.

Organising Data: Once we have collected the data, we need to organise it. A good way to do this is using a table.

Tables: A table arranges data in rows and columns, making it easy to see the information clearly.

Representing Data: Representing data means showing the data in a way that is easy to understand. Two common ways to represent data are pictograms and bar graphs.

Pictograms: A pictogram uses pictures to represent data. Each picture represents a certain number of items. It's important to have a key that tells you what each picture stands for.

Example: If you're showing favourite fruits and one apple picture represents 2 votes, then 3 apple pictures mean 6 votes (3 x 2 = 6).

Bar Graphs: A bar graph uses bars of different lengths to represent data. The length of each bar corresponds to the number of items in that category.

Bar graphs should always have: A title (e.g., "Favourite Colours in Grade 4") Labeled axes (the horizontal axis shows the categories, and the vertical axis shows the count) A scale (the numbers along the vertical axis, showing how many items each bar represents)

Interpreting Data: Interpreting data means understanding what the data tells us. We can look at the data displays (pictograms or bar graphs) and answer questions about the data.

Worked example

Example 1: Favourite Snacks

Mrs. Dlamini asked her Grade 4 class what their favourite snack was.

Here's the data she collected:

Chips: |||| |||| |||| | (16)

Fruit: |||| |||| (10)

Chocolate: |||| |||| || (12)

Biscuits: |||| | (6)

Organising the data into a table:

| Snack | Number of Learners |

| ----------- | ------------------ |

| Chips | 16 |

| Fruit | 10 |

| Chocolate | 12 |

| Biscuits | 6 |