Ratios/Rates/Proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is a rate?

Back

A rate is a specific kind of ratio that compares two different units, such as miles per hour or price per item.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

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CCSS.7.RP.A.2A

Front

How do you calculate the rate of speed?

Back

To calculate speed, divide the distance traveled by the time taken. Formula: Speed = Distance / Time.

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CCSS.6.RP.A.3B

Front

If Sara drives 330 miles in 5 hours, what is her speed?

Back

66 miles per hour.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How do you find the price per gallon of gas?

Back

To find the price per gallon, divide the total cost by the number of gallons. Formula: Price per gallon = Total cost / Gallons.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If it costs $46.80 to fill a 13-gallon tank, what is the price per gallon?

Back

$3.60 per gallon.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How do you determine the better buy between two products?

Back

Calculate the unit price (price per item) for each product and compare them. The lower unit price is the better buy.

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CCSS.6.RP.A.3B

Front

Which is the better buy: a 12-pack of Pepsi for $3.50 or a 6-pack for $1.80?

Back

The 12-pack is the better buy.

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CCSS.6.RP.A.3B

Front

How do you calculate the cost per pound of an item?

Back

To find the cost per pound, divide the total cost by the weight in pounds. Formula: Cost per pound = Total cost / Weight.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2