# Activities

• • • ##### Subject Area

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

• ##### Author 6-8

60 Minutes

• ##### Device
• TI-15 Explorer™
• ##### Other Materials
This is Activity 6 from the EXPLORATIONS Book:
Developing Problem-Solving Skills with the TI-15

The following materials are required for this activity:
• Decimeter cube (clear plastic measuring cube)
• Centimeter cubes (1,000)
• Chart paper
• Markers

Stepping Stones

#### Activity Overview

Students use volume formulas and proportional reasoning to calculate the amount of concrete needed to make stepping stones of a specific size.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 38 - 44 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• One serving of lemonade uses 11 parts water, 1 part lemon juice, and 2 parts sugar
• Calculate and record in a table how many tablespoons of each ingredient is used to make 1, 2, 3, and 4 servings

• Use centimeter cubes to fill a decimeter cube box
• Calculate the volume of the box

• Identify the dimensions of each stepping stone
• Calculate the volume of one stepping stone
• Place the decorative object and 5-mm layer of gravel
• Find the volume of gravel and concrete required for one stepping stone
• Determine the total amount of gravel and concrete needed to build the whole pathway
• Create a chart showing the calculations and the final information
• #### After the Activity

Students view each chart.

• Review student results
• As a class, discuss methods and formula used
• Re-teach concepts as necessary