# Activities

• • • ##### Subject Area

• Math: Middle Grades Math: Measurement
• Math: Middle Grades Math: Statistics and Probability
• Math: PreAlgebra: Measurement
• Math: PreAlgebra: Probability, Statistics and Data Analysis

• ##### Author 6-8

60 Minutes

• ##### Device
• TI-73 Explorer™
• ##### Other Materials
This is Activity 8 from the EXPLORATIONS Book:
Discovering Mathematics with the TI-73: Activities for Grades 5 and 6

The following materials are required for this activity:
• Tape measures (inches and centimeters)
• Pennies

#### Activity Overview

In this activity, students study English to Metric conversions. They investigate the relationship between inches and centimeters by measuring their height in these units and converting the measurements.

#### Before the Activity

• Divide students evenly according to their height into two groups
• See the attached PDF file for detailed instructions for this activity
• Print pages 35 - 40 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Use a ruler and compare the measure of an inch and a centimeter
• Observe that 1 inch equals about 2.5 centimeters
• Measure the height of one group in inches and the other in centimeters
• Enter the data as lists
• Calculate the mean height of the two groups
• Observe that the mean of the centimeter list is larger than the mean of the inches list
• Understand that the group which donates a penny for every centimeter, raises more money than the group which donates a penny for every inch
• Convert the data in the inches list to centimeters, and store it in another list
• Calculate the mean of this list, and compare it with the mean of the original centimeter list
• Identify which group of students will donate more money
• #### After the Activity

Students complete the Student Activity sheet.

Review student results:

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