Lesson Notes By Weeks and Term v5 - Grade 1

Lesson Video

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Performance objectives

• Collect and sort data
• Use pictures to show data in a graph
• Answer questions about your graph
• Practice adding and subtracting numbers up to 20

Lesson summary

Data handling is a very important skill in mathematics. It helps us organize information and understand what it means. Imagine you want to know which is the most popular fruit in your class or which colours are liked the most. Data handling helps us find out these things by collecting information (data) and then showing it in a way that makes sense, like a simple picture graph. This skill is useful in everyday life in South Africa; for example, knowing which flavour of Mageu is the most popular at the local spaza shop or which sport the most children in the neighbourhood play. By understanding data, we can make informed decisions and understand the world around us better.

Lesson notes

What is Data? Data is information. It could be anything like the colours of cars, the types of pets people have, or the favourite foods of your friends. We collect data by asking questions and writing down the answers.

Collecting Data: The easiest way to collect data is by asking questions! For example, if we want to know the favourite fruit of the class, we can ask each child, "What is your favourite fruit?" and write down their answers.

Sorting and Organizing Data: Once we have our data, we need to organize it. This means putting the same things together. For example, if 5 children like apples, we group all the "apples" together.

Picture Graphs: A picture graph uses pictures to show data. Each picture stands for one or more things. It makes it easy to see which thing is most popular or least popular.

Example 1: Favourite Fruits Let's say we asked 10 children their favourite fruit and got these answers: Apple: 3 Banana: 5 Orange: 2 We can make a picture graph like this (each fruit represents one vote): | Fruit | Picture Graph | | -------- | ----------------------------- | | Apple | 🍎 🍎 🍎 | | Banana | 🍌 🍌 🍌 🍌 🍌 | | Orange | 🍊 🍊 | From the picture graph, we can easily see that banana is the most popular fruit.

Example 2: Favourite Colours Let's say we asked 8 children their favourite colour and got these answers: Red: 4 Blue: 3 Green: 1 We can represent the data using blocks: Red: [Red Block][Red Block][Red Block][Red Block] Blue: [Blue Block][Blue Block][Blue Block] Green: [Green Block] Or, we can draw pictures. The learner should be aware that each picture represents a single item, which is the foundation for scaling in more advanced grades. Revising Addition and Subtraction within 20 Let's remind ourselves how to add and subtract.

Addition: Putting things together.

Example: 5 apples + 3 apples = 8 apples Subtraction: Taking things away.

Example: 10 sweets - 4 sweets = 6 sweets Example 3: Addition Practice Sipho has 7 marbles. Thandi gives him 5 more. How many marbles does Sipho have in total?

Calculation: 7 + 5 = 12 marbles Example 4: Subtraction Practice A baker baked 15 koeksisters. He sells 8 of them. How many koeksisters are left?

Calculation: 15 - 8 = 7 koeksisters Guided Practice (With Solutions)

Question 1: We asked 6 children which pet they liked the most.

The answers were: Cat, Dog, Cat, Fish, Cat, Dog. Make a tally chart and then a picture graph. Each animal picture represents one vote.

Solution: Tally Chart: Cat: 3 Dog: 2 Fish: 1 Picture Graph: | Pet | Picture Graph | | ---- | ------------------ | | Cat | 🐱 🐱 🐱 | | Dog | 🐶 🐶 | | Fish | 🐠 | Explanation: We first created a tally chart to count how many times each animal appeared. Then, we created a picture graph where each picture represents one vote.

Question 2: There are 12 students in a class. 7 students have brown eyes and the rest have blue eyes. How many students have blue eyes?

Solution: 12 - 7 = 5 students Explanation: We subtract the number of students with brown eyes from the total number of students to find the number of students with blue eyes.

Question 3: Use the data: 5 apples, 3 bananas, 2 oranges. Draw a block graph where each block represents a fruit.

Solution: Apples: [Block][Block][Block][Block][Block] Bananas: [Block][Block][Block] Oranges: [Block][Block] Explanation: The block graph visually represents the quantity of each fruit, with each block corresponding to one unit of fruit. Independent Practice (Questions Only) Ask 10 people in your family or neighbourhood what their favourite sport is. Write down their answers. Sort your data from question 1 into categories (e.g., Soccer, Rugby, Cricket, Other). Draw a picture graph to show your data from question

2. Each picture of a ball represents one person's vote. Which sport was the most popular in your data? Which was the least popular? You have 15 sweets. You give 6 to your friend. How many sweets do you have left? There are 8 birds sitting on a tree. 4 more birds fly to the tree. How many birds are there in total? A farmer has 10 cows. He sells 3 of them. How many cows does he have left? Use the following data and create a simple picture graph: Favourite ice cream flavours: Chocolate - 6; Vanilla - 4; Strawberry -

2. If you have 9 crayons and your brother gives you 4 more, how many crayons do you have now? Mama bakes 20 fat cakes. You eat 5 fat cakes. How many are left?