Education Technology

# Activities

• ##### Subject Area

• Math: PreAlgebra: Number Sense and Operations
• Math: PreAlgebra: Measurement
• Math: Middle Grades Math: Measurement
• Math: Middle Grades Math: Number Sense

6-8

60 Minutes

• ##### Device
• TI-73 Explorer™
• ##### Other Materials
This is Activity 7 from the EXPLORATIONS Book:
Discovering Mathematics with the TI-73: Activities for Grades 7 And 8

The following materials are required for this activity:
• Student Worksheet
• Ruler that measures to the nearest millimeter
• String
• Transparency

## Go for the Gold

#### Activity Overview

Students explore and use the concept of ratio in a real-world situation. They will make judgments regarding accuracy and precision of measurement.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 59 - 63 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Divide the class into teams of four
• Measure and record the distances between the features of the statue picture
• Measure and record the distances between features on each team member's face with the help of a string and ruler
• Calculate ratios of facial features
• Record the mean average ratios of each member (to the nearest thousand), mean average ratios of the group, and the class mean average ratios on the Student Worksheet
• Compare the individual average ratios to the ratios for the Greek statue and determine which ratio is closest to the Golden ratio
• #### After the Activity

Students will complete the Student Worksheet and analyze the results.

Review student results:

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