Lesson Notes By Weeks and Term v5 - Grade 1

Lesson Video

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Performance objectives

• Collect data using tally marks.
• Organize data into a simple table.
• Answer questions about data in a chart.
• Practice addition and subtraction within 20.
• Recognise and describe 2D shapes.

Lesson summary

This week, we will focus on data handling, which means collecting, organizing, and displaying information in a simple way. We'll also revise key math concepts we've learned so far this term. Understanding data handling is important because it helps us make sense of the world around us. For example, we can use data to see which fruits are the most popular in our class or which colours are most common in our school uniforms. Revising our previous lessons will help us become more confident mathematicians. Imagine you want to know which snack to bring to a picnic that most of your friends would like - you would need to collect data! These skills help you with decisions every day.

Lesson notes

Data Handling: Data is information. Data handling is the process of collecting, organizing, and showing data in a way that is easy to understand. We will focus on using tally marks, tables, and simple pictograms.

Tally Marks: Tally marks are a quick way to count. Each mark represents one item. When we get to five, we draw a line across the first four: |||| |||| . So 1 is |, 2 is ||, 3 is |||, 4 is ||||, and 5 is |||| .

Tables: A table is a way to organize data in rows and columns. This makes it easier to read and compare information.

Pictograms: A pictogram uses pictures to represent data. Each picture represents a certain number of items. For example, one picture of an apple could represent one apple.

Example 1: Favorite Fruits Let’s ask our classmates what their favorite fruits are. The options are apples, bananas, and oranges.

Collecting Data: We go around the class and ask each student their favorite fruit. We use tally marks to record their answers.

Apples: |||| || (7 votes)

Bananas: |||| |||| | (11 votes)

Oranges: |||| (5 votes)

Organizing Data in a Table: | Fruit | Tally Marks | Number of Votes | |---------|-------------|-----------------| | Apples | |||| || | 7 | | Bananas | |||| |||| | | 11 | | Oranges | |||| | 5 | Representing Data with Pictograms: We can use a picture of each fruit to represent the votes. Let's use one fruit picture for each vote.

Apples: 🍎🍎🍎🍎🍎🍎🍎 Bananas: 🍌🍌🍌🍌🍌🍌🍌🍌🍌🍌🍌 Oranges: 🍊🍊🍊🍊🍊 Addition and Subtraction within 20: Remember our number bonds! Addition means putting together and subtraction means taking away. We can use counters, fingers, or number lines to help us.

Example 2: Addition: 8 + 5 = ? We can start with 8 counters and add 5 more. 8, 9, 10, 11, 12,

1

3. So, 8 + 5 =

1

3. Subtraction: 15 - 7 = ? We can start with 15 counters and take away

7. We are left with

8. So, 15 - 7 = 8. 2D Shapes: These are flat shapes. We have circles (round like the sun), squares (four equal sides and corners), triangles (three sides and corners), and rectangles (four sides and corners, but two pairs of sides are equal).

Example 3: Find the shapes in our classroom! The clock is a circle. The window is a rectangle. Some signs may be squares or triangles. Guided Practice (With Solutions)

Question 1: Zanele asked her friends what their favourite colour is.

Here are the answers: Red, Blue, Red, Yellow, Blue, Blue, Red, Green, Blue, Red. Use tally marks to record the data.

Solution: Red: |||| (4)

Blue: |||| (4)

Yellow: | (1)

Green: | (1)

Explanation:* We made a tally mark for each answer Zanele received.

Question 2: Using the tally marks from Question 1, create a table showing the number of votes for each colour.

Solution: | Colour | Tally Marks | Number of Votes | |--------|-------------|-----------------| | Red | |||| | 4 | | Blue | |||| | 4 | | Yellow | | | 1 | | Green | | | 1 | Explanation: We transferred the information from the tally chart into a table for easier viewing.

Question 3: Look at the table you made in Question

2. Which colour is the most popular?

Solution: Red and Blue are equally the most popular, with 4 votes each.

Explanation:* We compared the number of votes in the table and found that Red and Blue have the highest number.

Question 4: Solve the addition problem: 9 + 6 = ?

Solution: 9 + 6 = 15 Explanation:* Start with

9. Count up 6 more: 10, 11, 12, 13, 14,

1

5. Alternatively, use counters or a number line.

Question 5: Solve the subtraction problem: 12 - 5 = ?

Solution: 12 - 5 = 7 Explanation:* Start with

1

2. Count back 5 numbers: 11, 10, 9, 8,

7. Alternatively, use counters and physically take away

5. Independent Practice (Questions Only) Sipho asked his family what their favourite animals are.

Here are the answers: Dog, Cat, Dog, Bird, Dog, Cat, Fish, Dog, Cat, Cat. Use tally marks to record the data. Create a table showing the number of votes for each animal from Sipho's data. Which animal is the most popular in Sipho's family? Represent Sipho's data in a pictogram using a picture of each animal (one picture represents one vote).

Solve: 7 + 8 = ?

Solve: 14 - 6 = ? Draw a circle and a square. How many sides does a triangle have? Is a door usually shaped like a square or a rectangle?

Solve: 5 + 5 + 5 = ?