Education Technology

# Activities

• ##### Subject Area

• Math: Elementary Math: Algebraic Thinking
• Math: Elementary Math: Probability, Statistics and Data Analysis

K-5

60 Minutes

• ##### Device
• TI-15 Explorer™
• ##### Other Materials
This is Activity 7 from the EXPLORATIONS Book:
A World of Mathematics: Activities for Grades 4, 5, and 6 Using the TI-15

The following materials are required for this activity:
• Poster paper for visual display
• Chart-sized grid paper (optional or visual display)
• Markers
• Paper, pencils

## Hat Trick

#### Activity Overview

Students learn to solve a real-world problem in economics. Students get to understand how surveys often use a sample of people rather than all of the people involved. They also learn how to make decisions based on the results of a sample survey.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 43 - 49 from the attached PDF file for your class
• Review the four steps of problem solving with the students
• #### During the Activity

Distribute the pages to the class.

• Understand the problem and study the facts given
• Make a plan on how to determine the number of hats the company should make in each size, color, and logo
• Conduct a survey in class to determine the favorite colors, hat sizes, and favorite sports team
• Discuss how surveys are made with a sample rather than all the people
• Use the survey results to find out which hats will sell
• Make a presentation of the survey results
• Identify what information and how this information should be displayed in the presentation

• Using pi
• Use the calculator and the value of pi to find the circumference and diameter of a circle
• #### After the Activity

Students evaluate each presentation.

• Review student results
• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary