1. A ratio with a denominator of 1. Per means “for each unit.”
A unit rate is:
A unit cost is:
You can use proportions to find the unit rate and unit cost of an item.
* Always round money to the nearest cent (if the answer is not exact money).
Examples:
Write a ratio for each unit rate.
1. 23 miles per gallon
2. $55 an hour for repairs
Find the unit rate for each ratio.
3. 6 servings in 3 cups ounces in 5 boxes
4. $21 for 6 tickets 6. $52 for 8 hours
A ratio with a denominator of 1. Per means “for each unit.”
The cost of one unit of an item

2. Price Comparison – you can find the better buy by:
Find the unit prices for each. Compare. Circle the better buy.
7. Which is the better buy? 2 boxes for $5.00 OR 4 boxes for $10.20
8. Which is the better buy? 6 oranges for $2.10 OR 5 oranges for $2.00
9. Sam could buy a 2-lb bag of apples for $1.58 or a 3-lb bag of apples for $1.95.
How much would Sam save per pound if he bought the bag that was the better buy?
Comparing unit prices