INTRODUCTIONS TO UNIT 2 Ratios, Rates and Unit Rates.

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Presentation transcript:

INTRODUCTIONS TO UNIT 2 Ratios, Rates and Unit Rates

Ratios and Rates Help compare: Part to part (boys to girls) Part to whole (boys to students) Whole to part (Total students to boys) Order matters Ratios can be written from pictures or from tables RatiosRatios continued

Ratios

Use the table to write a ratio 3 ways Lady Gaga’s Accessories AccessoriesHow many Sunglasses25 Earrings30 Wigs45 Scarves35 Shoes50 How do you wake Lady Gaga up? You poke her face!!! HAHAHA

Rates  A rate is a special ratio, compares 2 quantities that have different units of measure  Examples:  3 shirts for $9  16 gallons of gas for $64  Sue drove 100 miles in 2 hours

Unit Rates  A unit rate is a special rate comparing something to ONE unit only  Why do we care about Unit Rate? It helps us decide what is cheaper!!!  Can be expressed using the word per

Unit Rate – what is the better buy? 4 shirts cost $ shirts cost $18.00 What’s the better buy? 4 shirts for $8.00 because each shirt costs $2.00

What is the better buy – a 6oz bag of flour for $2.40 or a 12 oz bag for $6.00?  Figure out the cost of ONE ounce  Divide $6.00 by 12  .50 per ounce 6 ounces of flour costs $ ounces of flour costs $6.00 What’s the better buy? It’s cheaper to buy the 12 ounces of flour because it costs less per ounce.

More Practice…. Write each ratio 3 ways

More Practice…….  You can buy 2 ice cream cones for $3.00 or 4 ice cream cones for $7.00. Which is the better buy? 2 cones = $1.50 per cone. 4 cones = $1.75 per cone. It is cheaper to buy 2 cones  Jason makes $36.00 for 6 hours of work and Michael makes $24.00 for 3 hours of work. Who makes more money per hour? Jason makes $6 per hour and Michael makes $8 per hour. Michael makes more money  A Hummer can get 60 miles for 5 gallons of gas and a Camry can get 40 miles on 2 gallons of gas. How many miles does each car get per gallon? Which car gets more miles per gallon? Hummer = An average of 14miles/gallon. Camry = An average of 20 miles/gallon. Camry gets more miles per gallon