Education Technology

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  • Subject Area

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

  • Author

    Texas Instruments

  • Level

    K-5

  • Activity Time

    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
    • Overhead projector or chalkboard
    • Paper, pencils
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Hat Trick

Published on 06/09/2008

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.

    Follow the activity procedures:

  • 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