7.3 Proportional Relationships
Beginning Lesson
New Twenty
How does life expectancy affect how you live your life? Students use proportions to determine what life expectancy must have been in the past in order for the phrase "30 is the new 20" to be accurate, and explore how life might change as life expectancy changes.
Middle Lessons
Civic Duty
Is it worth paying extra for a hybrid car? Students use proportional reasoning to determine how much hybrid owners save on gas, and how long it will take to make up the price difference.
Coupon Clipping
Are coupons always a good deal? Students use unit rates and percents to explore the math and psychology behind retail discounts.
Family Plan
How much should you pay for a shared wireless plan? Students use proportional reasoning to predict whether a family will go over their minutes, messages, or megabytes, and decide how much each person should pay.
I'd Like to Buy a Vowel
How much should vowels cost on Wheel of Fortune? Students use ratios and percents to explore what would happen if Wheel of Fortune charged prices for vowels based on how often they come up.
Need for Speed
How much does it cost to drive at different speeds? Students use unit rates and proportions to explore how a car's fuel economy changes as it drives faster and faster.
Text Me Later
How dangerous is texting and driving? Students use proportional reasoning to determine how far a car travels in the time it takes to send a message, and explore the consequences of distracted driving.
End Lessons
On Your Mark
Do taller sprinters have an unfair advantage? Students use proportions to find out what would happen if Olympic races were organized by height.
Coupon Clipping
Are coupons always a good deal? Students use unit rates and percents to explore the math and psychology behind retail discounts.
Family Plan
How much should you pay for a shared wireless plan? Students use proportional reasoning to predict whether a family will go over their minutes, messages, or megabytes, and decide how much each person should pay.
Need for Speed
How much does it cost to drive at different speeds? Students use unit rates and proportions to explore how a car's fuel economy changes as it drives faster and faster.
Text Me Later
How dangerous is texting and driving? Students use proportional reasoning to determine how far a car travels in the time it takes to send a message, and explore the consequences of distracted driving.