Lesson Notes By Weeks and Term v5 - Grade 4

Lesson Video

This page supports the lesson note with a companion video and a short classroom-ready summary.

For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.

Performance objectives

• Collect data using surveys and tally charts.
• Organize data into tables.
• Represent data using pictographs and bar graphs.
• Answer questions using data from graphs.

Lesson summary

Data handling is all about collecting, organizing, and understanding information around us. We use data every day, even if we don't realize it! Think about deciding what to wear based on the weather forecast, or your family deciding which groceries to buy based on what everyone likes. In South Africa, data handling helps us understand things like the popularity of different sports, how many people speak each language, and even track the growth of our favourite fruits and vegetables. By learning about data handling, you'll become better at making informed decisions and understanding the world around you.

Lesson notes

What is Data? Data is a collection of facts, figures, or information. It can be anything from the number of students in your class who like soccer to the types of birds you see in your garden.

Collecting Data: The first step in data handling is to collect the data. One common way to do this is using a survey. A survey is a set of questions you ask people to gather information. Another way is to simply observe and record what you see. For example, you can observe which colour cars pass your house. To keep track of your findings, you can use a tally chart. A tally chart uses tally marks (lines) to represent each observation. Usually, we group the tally marks in sets of five, with the fifth line crossing the other four, like this: ||||. This makes counting easier.

Example 1: Survey on Favourite Fruits Let’s say we want to find out which fruits are the most popular among Grade 4 learners. We could create a simple survey asking each learner to choose their favourite fruit from a list.

Here's a tally chart example: | Fruit | Tally Marks | Number | |------------|-------------|--------| | Apples | |||| ||| | 8 | | Bananas | |||| |||| || | 12 | | Oranges | |||| | | 6 | | Mangoes | |||| || | 7 | | Watermelon | |||| | 5 | Organizing Data: Using Tables After collecting the data, we need to organize it. A simple way to organize data is to put it in a table. A table has rows and columns, making it easy to see the information in a structured way. Look at the 'Number' column from the example above. That represents the table organisation of the data.

Representing Data: Pictographs and Bar Graphs Once the data is organized, we can represent it visually using pictographs or bar graphs.

Pictograph: A pictograph uses pictures or symbols 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 2: Pictograph of Favourite Fruits (using the same fruit data). Let's say one fruit picture represents 2 fruits. | Fruit | Pictograph | |------------|-----------------------------------| | Apples | 🍎🍎🍎🍎 | | Bananas | 🍌🍌🍌🍌🍌🍌 | | Oranges | 🍊🍊🍊 | | Mangoes | 🥭🥭🥭🥭 | | Watermelon | 🍉🍉🍉 | Key: 🍎 = 2 Apples, 🍌 = 2 Bananas, 🍊 = 2 Oranges, 🥭 = 2 Mangoes, 🍉 = 2 Watermelons Bar Graph: A bar graph uses bars of different lengths to represent data. The length of each bar corresponds to the value it represents. Bar graphs have a horizontal axis (x-axis) and a vertical axis (y-axis). The x-axis often represents the categories (e.g., fruits), and the y-axis represents the number of items (e.g., number of learners). Choosing an appropriate scale (the values on the y-axis) is important. It allows you to represent all the data clearly without the bar graph being too squashed or too tall.

Example 3: Bar Graph of Favourite Fruits (using the same fruit data). The x-axis would list the fruits (Apples, Bananas, Oranges, Mangoes, Watermelon). The y-axis would be labelled "Number of Learners" and have a scale from 0 to 12 (or even 0 to 15 to allow some space above the highest bar), going up in intervals of 1 or

2. The height of the 'Bananas' bar would reach 12, the height of the 'Apples' bar would reach 8, and so on.

Interpreting Data: The final step is to interpret the data, which means to understand what the data tells us. We can answer questions based on the graphs and tables we created. For example, we can see which fruit is the most popular, which is the least popular, and how many more learners prefer bananas to apples. Guided Practice (With Solutions)

Question 1: Sarah surveyed her classmates about their favourite ice cream flavours.

Here's the tally chart: | Flavour | Tally Marks | |-----------|-------------| | Vanilla | |||| || | | Chocolate | |||| |||| | | Strawberry| |||| | | | Bubblegum | ||| | How many students chose chocolate as their favourite flavour?

Solution: Count the tally marks for Chocolate: |||| ||||. This is 5 + 5 =

1

0. Answer: 10 students chose chocolate.

Question 2: Using the ice cream data from Question 1, create a table showing the number of students for each flavour.

Solution: | Flavour | Number of Students | |-----------|--------------------| | Vanilla | 7 | | Chocolate | 10 | | Strawberry| 5 | | Bubblegum | 3 | Question 3: The following pictograph shows the number of rainy days in Durban for each month. Each umbrella symbol represents 2 rainy days. | Month | Pictograph | |-----------|----------------------------| | January | ☔☔☔☔☔ | | February | ☔☔☔ | | March | ☔☔☔☔☔☔ | | April | ☔☔☔☔ | How many rainy days were there in February?

Solution: Each umbrella represents 2 rainy days. February has ☔☔☔, which is 3 umbrellas. 3 x 2 = 6 rainy days.

Answer: There were 6 rainy days in February.

Question 4: Draw a bar graph to represent the number of books read by four learners in a term. Thando read 8 books, Aisha read 12 books, Sipho read 6 books, and Zola read 10 books. The y-axis should range from 0 to 14 and increase in intervals of 2.