Unit Rates. Rate – a ratio that compares different kinds of units by division to obtain a unit rate or rate per unit. Unit Rates (You are finding how.

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Presentation transcript:

Unit Rates

Rate – a ratio that compares different kinds of units by division to obtain a unit rate or rate per unit. Unit Rates (You are finding how much for 1 of something. Or the rate when the denominator is 1)

To express a ratio as a rate per unit, write the ratio as a fraction and then divide the numerator by the denominator. 395 miles in 5 hours = 79 miles per hour miles hours miles hour Unit Rates

120 words in 3 minutes = 40 words per minute words per minute Unit Rates

If it costs $78 for 13 sandwiches, What is the unit rate? Unit Rates

The cost of a 12-ounce box of Cheerios is $3.29. Publix brand Cheerios cost $4.89 for an 18- ounce box. Find the unit rate to find the better buy. Unit Rates

Miles per Gallon M.P.G. stands for miles per gallon and is usually used for gas mileage in cars. Unit Rates

If it takes 16 gallons to drive 352 miles, What is the unit rate or m.p.g.? Unit Rates

Pens can be purchased in a 5-pack for $1.95 or a 15- pack for $6.20. Which is the better buy? Divide the price by the number of pens. price for package number of pens  $ =$0.39 price for package number of pens = $  $0.41 The better buy is the 5-pack for $1.95. Unit Rates

Jamie can buy a 15-oz jar of peanut butter for $2.19 or a 20-oz jar for $2.78. Which is the better buy?  $ = $0.15 = $  $0.14 The better buy is the 20-oz jar for $2.78. price for jar number of ounces price for jar number of ounces Divide the price by the number of ounces. Unit Rates

1. John can buy a 8 pencils for $1.25 or a 12 pencils for $2.00. Which is the better buy? 2. Mary made $25.00 for working 7 hours at the mall. How much did Mary make per hour? Unit Rates $1.25 / 8 = $0.16 $2.00 / 12 = $0.17 $25.00 / 7 hours = $3.57 / Hr

Unit Rates 4. Lisa paid $ for 3 pair of jeans. What did Lisa pay for each pair of jeans? 5. Bob typed 593 words in 4 minutes. How many words did Bob type per minute? 593 / 4 minutes = words/minute $ / 3 pair of jeans = $52.67 per jean