Education Technology

# Activities

• ##### Subject Area

• Math: Middle Grades Math: Algebraic Thinking
• Math: Middle Grades Math: Number Sense

6-8

45 Minutes

• ##### Device
• TI-73 Explorer™
• TI-Navigator™

## Smart Shoppers

#### Activity Overview

In this activity, students will compare ratios with different denominators, and then with common denominators. They will also find unit rates.

#### Key Steps

• Students will find discounts and sale prices for items selling at 20% off and 40% off by using tables. They will then find the general rules, using a variable, for finding those discounts and prices.

First, students will create a table showing the discount and sale price for the 20% off sale the sporting goods store is having. The calculations will initially be done on the Home screen.

• Then, students will enter equations for the discount and the sale price in the Y= editor to set up a table.

• Finally, students will explore the 20% off table before exploring a 40% off sale.