SPI 1.3 Cost per Unit Flashcards
What are other words used for cost per unit?
- best buy
- price per unit
- unit rate
- unit cost
How does rate differ from unit rate?
A rate is a comparison of two quantities of unlike things by division, like miles and gallons.
A unit rate is the cost of one of something.
When written as a fraction, a rate has a denominator of any natural number; a unit rate has a denominator of 1.
.
What does unit rate mean?
It is how much it costs to buy one of something.
For example if a 5-pound roast costs $8.00, the cost of one pound of this roast is $8.00/5 pounds which is $1.60 per 1 pound.
By dividing how much by how many you calculate how much each one unit of the item will cost.
How is a rate converted to a unit rate?
By dividing.
To calculate the unit rate for 4 apples that cost $1, divide the price by the number of units there are (how many there are).
$1.00/4apples = $0.25 per apple
Why are unit rates important?
Knowing how to calculate unit rate helps you compare prices of different sizes, allowing you to spend your money more wisely.
For example you can decide whether a small box or a large box of cereal gives you the most cereal for the money spent.
What does the graphic organizer for converting rates to unit rates and comparing look like?
Rate to Unit Rate and Compare Graphic Organizer
What is an example of a rate and the correspondng unit rate?
If 10 gallons of gas costs $32.10 (a rate), 1 gallon of gas costs $3.21 (a unit rate).
How can proportions be used to calculate unit rate?
EX: 4 apples that sell for $1.00?
How can proportions be used to calculate the cost of any number of units?
EX: If 4 apples cost $1.00, how much would 9 apples cost?
What graphic organizer can be used to compare using unit rates?
How do I solve unit rate problems that ask, “How much can I save by choosing the least unit rate over choosing the higher unit rate?”
- Calculate the unit rate of both items being compared.
- Calculate higher unit rate - lower unit rate.
