Unit Price
Unit price is the cost per single unit of a product, calculated by dividing the total price by the quantity. For a 20-ounce box of cereal at $4.00, the unit price is $4.00 / 20 = $0.20 per ounce. Comparing unit prices is the standard method for identifying the better buy among different product sizes. This practical math skill is taught in Chapter 5 of Saxon Math Course 2 and gives 7th grade students a real-world application of division and ratios that they use every time they shop.
Key Concepts
Property Unit Price is the cost for a single unit of a product. It is a ratio of price to quantity that is often posted in supermarkets to help customers identify the better buy.
Examples Find the unit price of a 20 ounce box of cereal that costs 4.00 dollars: $$ \frac{4.00 \text{ dollars}}{20 \text{ ounces}} = \frac{0.20 \text{ dollars}}{1 \text{ ounce}} $$ Find the unit price of a 16 ounce bottle of juice that costs 4.00 dollars: $$ \frac{4.00 \text{ dollars}}{16 \text{ ounces}} = \frac{0.25 \text{ dollars}}{1 \text{ ounce}} $$.
Explanation Unit price is your superpower for smart shopping! It is a special rate that reveals the cost for just one item, like one ounce of chips or one can of soda. By dividing the total price by the number of items, you can easily compare different packages and find the true best deal.
Common Questions
What is unit price?
Unit price is the cost for one unit of a product. It is calculated by dividing the total price by the number of units. For example, $6.00 for 24 ounces gives a unit price of $0.25 per ounce.
How do you find the better buy using unit price?
Calculate the unit price for each option and compare. The product with the lower unit price is the better buy, regardless of package size.
How do you calculate unit price?
Divide the price by the quantity: Unit Price = Total Price / Number of Units. Make sure both items use the same unit of measurement before comparing.
Why is unit price important?
Unit price allows consumers to make fair comparisons between products of different sizes. A larger package is not always the better deal; the unit price reveals the true cost.
What are common mistakes when calculating unit price?
Students sometimes divide the quantity by the price instead of the price by the quantity. Also, comparing unit prices only works when the units of measurement are the same.
Is unit price part of 7th grade math?
Yes. Saxon Math Course 2 covers unit price in Chapter 5 as an application of ratios and division to real-world consumer math.