1. Ratio & Unit Rate

2. A ratio is a comparison of two or more quantities in the same category.
Example: A ratio of boys to girls or
A ratio of apples to oranges
A ratio of cars to trucks
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3. Either way, you read it as three to five
A ratio can be written three ways:
3: /5 3 to 5
Either way, you read it as three to five
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4. Ratios are often expressed as fractions in simplest form or as a decimal.
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5. What ratios can we form from the tiles above?
Order matters! What you say is what you write.
If you say green to blue, you write green to blue: 12 to 8
What ratios can we form from the tiles above?
12 to 8
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6. Create as many ratios as possible
Create as many ratios as possible. Write each ratio three different ways.
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7. Simplest Form
Write the ratio 50 to 300 in simplest form.
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8. Simplest Form
Write the ratio 60 to 12 in simplest form.
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9. Rate
Rate: A comparison of two quantities that have different units of measure. You are comparing unlike things (often time, but not always!)
Miles per Hour
Cost per Pound
Words per Minute
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10. Unit Rate
A Unit Rate is a rate simplified so that one of the quantities equals 1.
Ex. You want to know the cost or amount for 1.
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11. Unit Rate
If it takes 10 gallons to drive 250 miles, What is the unit rate or m.p.g.?
= 25 1
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12. Unit Rate
If it costs $78 for 13 sandwiches, What is the unit rate?
= 6 1
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13. Mile per Gallon
M.P.G. stands for miles per gallon and is usually used for gas mileage in cars.
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14. Find the ratio of pizzas to Doritos.
Now you try it!
Last month Tim ate 4 pizzas, 6 burgers, 5 hotdogs and 10 bags of Doritos.
Find the ratio of pizzas to Doritos.
Find the ratio of hotdogs to the total foods Tim ate.
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15. A pet store sold 3 parakeets, 12 gold fish, and 6 turtles last week.
Now you try it!
A pet store sold 3 parakeets, 12 gold fish, and 6 turtles last week.
Find the ratio of parakeets to turtles.
Find the ratio of turtles to gold fish.
Find the ratio of gold fish to the total pets sold.
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16. What kind of ratio is this?
Now you try it!
Marco’s family drove 320 miles yesterday. It took them 8 hours. How many miles did they travel per hour?
What kind of ratio is this?
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