Are coupons always a good deal? Retailers like JCPenney use coupons to offer their shoppers great-looking deals, but there’s a catch: Before putting an item on sale, a store often first raises its price.
In this lesson, students reason with percents and proportions to evaluate enticing coupons and debate whether retailers should be allowed to raise the price of items in order to then put them on sale.
Use percents to calculate sale prices after a discount
Given a new price and a percent discount, use proportional reasoning to determine the original price
Before you begin
Students should be able to solve basic problems involving percents, including percent increase and decrease.
Why do concert tickets cost so much? Students use percents to describe how much of a ticket’s price goes to various parties -- artist, venue, brokers, etc. -- and debate the fairest ways to price and sell event tickets.
How dangerous is texting and driving? Students use proportional reasoning to determine how far a car travels in the time it takes to text. Students discuss the dangers of distracted driving and generate strategies for helping drivers and passengers stay safe.
Why do tires appear to spin backwards in some car commercials? Students apply unit rates and the formula for the circumference of a circle to determine what makes a spinning wheel sometimes look like it’s moving in the opposite direction of the car sitting on top of it.
Geometry (G), Ratios and Proportional Relationships (RP)
Should people with small feet pay less for shoes? Students use unit rates to calculate how much different-sized shoes cost per ounce and debate the fairest way for manufacturers to charge for their shoes.
How long does it take to donate to Locks of Love? Students write and solve linear equations to determine how long it would take to donate a wig’s worth of hair and discuss ways they can support peers with conditions like Leukemia and alopecia.
Is it a good idea to rent a storage unit? Students write and solve multi-step equations to evaluate whether storage unit rentals are worth the cost and make recommendations for when people should store, sell, donate, or toss their unused stuff.
How have video game consoles changed over time? Students create exponential models to predict the speed of video game processors over time, compare their predictions to observed speeds, and consider the consequences as digital simulations become increasingly lifelike.
Building Functions (BF), Interpreting Categorical and Quantitative Data (ID), Interpreting Functions (IF), Linear, Quadratic, and Exponential Models (LE), Seeing Structure in Expressions (SSE)