Today’s Objective To be able to use ratios and relate quantities in the same units.

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Presentation transcript:

Today’s Objective To be able to use ratios and relate quantities in the same units.

Suppose….. You had two U.S. coins that total 55 cents. One of the coins is not a nickel, what are the two coins?

Suppose….. That you were riding in the back seat of a car that was traveling on I-10 and you wanted to determine the speed of the car without looking at the speedometer. Is this possible?

Yes… Speed is determined by How many miles traveled in an hour Step 1.. Find out, in seconds, how long it takes to travel between any two mile markers (distance is 1 mile). Step 2.. Determine how many seconds in an hour. 1 hour = 1 minute = 60 minutes 60 seconds

Convert 1 hour to seconds 1 hour = 60 minutes 1 minute = 60 seconds So 1 hour =60minutes x 60seconds 1 hour =3600 seconds

Determine mph (speed) 1miles • 3600sec = 65 sec hour 55.3 miles hour

Using Rates Miles per gallon = mpg If it takes 11 gallons to drive 250 miles, What is the mpg? 250 miles / 11 gallons = 22.7 miles / gallon 22.7 mpg

Using Rates Dollar / hour = hour wage If you work 4 hours and get paid $20.00, What is your hourly wage? 20 dollars / 4 hour = 5 dollars / hour

Using Ratios Hair grows at a rate of 5 inches per year. How much would your hair grow in 6 months? 5inches • 1 year = 1 year 2 2.5 inches 5 inches 2

Classwork Do worksheet 2.8 homework page 110 (1-19)