Mathematics - Junior Secondary 3 - Data presentation - Pie charts

Data presentation - Pie charts

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TERM: 3RD TERM

WEEK 5

Class: Junior Secondary School 3
Age: 14 years
Duration: 40 minutes of 5 periods
Subject: Mathematics
Topic: Data Presentation – Pie Charts
Focus: Using Pie Charts to Represent Data

SPECIFIC OBJECTIVES:

By the end of the lesson, pupils should be able to:

  1. Understand the concept of pie charts and their uses.
  2. Draw and label pie charts accurately.
  3. Interpret data from pie charts.
  4. Use pie charts to represent real-life data.
  5. Solve word problems involving pie charts.

INSTRUCTIONAL TECHNIQUES:

  • Question and answer
  • Guided demonstration
  • Group work
  • Practical exercises
  • Discussions

INSTRUCTIONAL MATERIALS:

  • Circle (pie) chart template
  • Data sets for pie charts
  • Protractor (optional)
  • Worksheet with pie chart problems
  • Whiteboard and marker

 

PERIOD 1 & 2: Introduction to Pie Charts

PRESENTATION:

Step

Teacher’s Activity

Pupil’s Activity

Step 1 - Introduction

Introduces the concept of pie charts, explaining how they represent parts of a whole.

Pupils listen and ask questions.

Step 2 - Explanation

Explains how to calculate the angles for each sector in a pie chart using the formula: (Value / Total) × 360°.

Pupils take notes and participate in calculations.

Step 3 - Demonstration

Demonstrates how to draw a pie chart using a simple data set.

Pupils follow along, drawing their own charts.

Step 4 - Practice

Gives pupils a data set and asks them to create their own pie chart.

Pupils work individually, creating their pie charts.

EVALUATION (5 exercises):

  1. Draw a pie chart for this data set: Red = 20, Blue = 30, Green = 50.
  2. Convert this data into angles: 50, 100, 150.
  3. Draw a pie chart for the following data: Dogs = 40, Cats = 30, Birds = 20, Fish = 10.
  4. Create a pie chart using data: Sales = 300, Returns = 50, Profit = 150.
  5. Find the angle for the sales data.

CLASSWORK (5 questions):

  1. Draw a pie chart for the following data: Apples = 25, Bananas = 15, Oranges = 30.
  2. Calculate the angle for 10, 15, and 25 if the total is 50.
  3. Draw a pie chart for the hours spent in a day: 8 hours studying, 7 hours sleeping, 9 hours playing.
  4. Draw a pie chart for sports participation data: Football = 40, Basketball = 35, Tennis = 25.
  5. Calculate the angle for a pie chart with the following data: 100 students, 20 prefer basketball, 30 prefer football, 50 prefer tennis.

ASSIGNMENT (5 tasks):

  1. Create a pie chart for data on favorite colors: 30 red, 20 blue, 40 green.
  2. Calculate the angles for this data: 15, 30, 45. Draw a pie chart.
  3. Interpret the data in a pie chart: 10, 20, 40, 30.
  4. Create a pie chart for data on pets owned by classmates.

Draw and interpret a pie chart based on a class survey about favorite foods.