# Activities

• • • ##### Subject Area

• Math: Elementary Math: Geometry
• Math: Middle Grades Math: Geometry
• Math: PreAlgebra: Geometry

• ##### Author K-5

60 Minutes

• ##### Device
• TI-73 Explorer™
• ##### Other Materials
This is Activity 5 from the EXPLORATIONS Book:
Integrating Handheld Technology into the Elementary Mathematics Classroom .

## Geometry and Measurement

#### Activity Overview

Students learn to explore relationships between units of measure and objects to be measured. They develop an understanding of length, area, and volume.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 47 - 62 from the attached PDF file
• #### During the Activity

Distribute the pages to the class

Follow the activity procedure:
Activity 1: Popcorn Container

• Use a rectangular piece of paper and examine a cylinder made by joining the long sides and another cylinder made by joining the short sides
• Calculate the volume of the two cylinders using the formulas for the circumference of a circle and the volume of a cylinder
• Observe that though the surface area is the same the two cylinders have different volume

• Activity 2: Hexaright
• Draw six-sided hexagons on square centimeter graph paper, sides along the lines on the paper, adjacent sides being perpendicular, and with perimeters of 28 cm
• Observe that the perimeter of the hexagon is the perimeter of the related rectangle
• Find the area of the largest hexagon
• Observe that the largest area is found by removing one square from the corner of a 7 x 7 square and is 48 square centimeter

• Activity 3: Eggsactly
• Use calipers to measure the length and width of eggs and record the data
• Predict the length and width of a chicken egg
• Plot the width and length data as a scatter plot
• Use linear regression to find the line of best fit
• Find the expression relating the length and width of the eggs
• Use other elementary school activities to develop an understanding of measurement and geometry
• #### After the Activity

Review students results and re-teach concepts as necessary.