# Activities

• • • ##### Subject Area

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

• ##### Author 6-8

60 Minutes

• ##### Device
• TI-15 Explorer™
• ##### Other Materials
This is Activity 8 from the EXPLORATIONS Book:
Developing Problem-Solving Skills with the TI-15

The following materials are required for this activity:
• Chart paper
• Markers
• ##### Report an Issue

Thrift Store Markdowns

#### Activity Overview

Students will calculate a series of discounts using increasing unit fractions.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 52 - 57 from the attached PDF file for your class
• Understand the concept of discount price
• #### During the Activity

Distribute the pages to the class.

• Use the two different original prices and the fraction marked off to determine the sale price and thus the better buy

• Record the beginning price for one piece of the furniture
• Find the reduced prices of the piece of furniture using different discount patterns
• Calculate the fraction amount and dollar amount of the price reduction each week
• Determine the number of weeks before the price is about half of the original price for each of the three discount patterns
• Decide on the best discount pattern
• Create a chart with the calculations
• #### After the Activity

Students share the charts they created.

• Review student results
• As a class, discuss the similarities and differences between the charts and the calculation method
• Re-teach concepts as necessary