Education Technology

# Activities

• ##### Subject Area

• Math: Middle Grades Math: Problem Solving
• Math: Middle Grades Math: Number Sense
• Math: Middle Grades Math: Algebraic Thinking
• Math: PreAlgebra: Measurement
• Math: PreAlgebra: Number Sense and Operations

6-8

60 Minutes

• ##### Device
• TI-15 Explorer™
• ##### Other Materials
This is Activity 10 from the EXPLORATIONS Book:
Developing Problem-Solving Skills with the TI-15

The following materials are required for this activity:
• Pencils
• 12 X 18 paper
• Rulers
• Photograph of the teacher or one of the students

## Set Design

#### Activity Overview

Students will use similarity concepts, and the dimensions of the carvings on Mt. Rushmore to create a proportional representation of the carvings for a stage backdrop.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 66 - 72 from the attached PDF file for your class
• Study the activity on pages 68 - 69 and understand the concept of similarity
• #### During the Activity

Distribute the pages to the class.

• Find the relationship between the real bed and the doll bed
• Find the ratio of the short sides of the real bed and the doll bed
• Use the ratio to find the sides of the quilt

• Study the height and mouth measurements, eye span and nose length of the four faces carved on Mount Rushmore
• Note the backdrop is 16 feet high and 24 feet wide and that for the scale drawing is 12" x 18"
• Find the scale to be used in the drawing
• Draw the ovals for the faces and sketch the eyes, ears, nose, and mouth for each face
• Note the dimensions used
• #### After the Activity

Students present their results to the class.

• Review student results
• As a class, discuss the various calculations used
• Re-teach concepts as necessary