RATESObjective: Student find and compare unit rates such as unit rates and unit price.

BACK TO WRITING RATIOSSuppose Ms. McLamb drove 75 miles in 3 hours. Write the ratio of miles to hours in fraction form.

75:

3Ratio or 75 miles

3 hourThis is a rate.

RATEWhat is a rate?A rate is a comparison of two quantities using division(sounds like ratios, right?) that have different units.

Example:75

:3

ratio 75miles:

3 rate

hours

Reads “60 m

iles

per 2 hours”

25 mi

1 h

This is

a

unit

rate

UNIT RATEWhat is a unit rate?A unit rate is a rate in which the denominator has a quantity of 1 unit.Example: 4 packets of oatmeal per 2 cup of water.

4:

2 cups

packetsrate 2

:1 cups

packetsunit rate

WRITING RATES AND UNIT RATESFind the unit rates and write them in fraction and word form.

Kaylie biked 40 miles(mi) in 4 hours(hrs).

Write to rate in fraction form.

Find the unit rate.

Write in word form.

40 mi

4 hrs40 mi

4 hrs

4

4

10 mi

1 hr

Kaylie rode 10 miles per hour.

GCF of 40 and 4

UNIT PRICEWhat is a unit price?A unit price is a unit rate that compares cost to item(or cost per item)Example: $5 for 2 bags of family size chips

price of bags $5 :

number of bags 2unit price $2.50 /bag

APPLICATIONThe local farmers market salelemonade in three sizes. Which size has the lowest price per fluid ounce?

Size Price

12 oz $0.89

18 oz $1.69

24 oz $2.09

12 oz 18 oz 24 oz

$0.89

12oz

$0.07

1oz

$1.69

18oz

$2.09

24oz

$0.09

1oz

$0.09

1oz

Since $0.07 <$0.09 the 12 oz lemonade has the lowest price per fluid ounce.

EXAMPLE 1:A faucet leaks 668 milliliters of water in 8 minutes. How many milliliter of water does the facet leak per minute?

EXAMPLE 2:In the 1st Indianapolis 500, the winning car covered 500 miles in 6.7 hours. What as the car’s average rate of speed in miles per hour?

EXAMPLE 3:Which is the better deal, 450 texts for $49.99 or 800 texts for $62.99?