Ratios/Rates/Proportions

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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

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What is a rate?

Back

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

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CCSS.6.RP.A.1

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What is a unit rate?

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A unit rate is a rate in which the second quantity is one unit, allowing for easy comparison.

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CCSS.6.RP.A.1

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How do you calculate a unit rate?

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To calculate a unit rate, divide the first quantity by the second quantity to find the amount per one unit.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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What is a proportion?

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

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CCSS.7.RP.A.2A

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How do you solve a proportion?

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To solve a proportion, cross-multiply and then divide to find the unknown value.

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CCSS.7.RP.A.2C

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If a car travels 240 miles in 4 hours, what is its speed in miles per hour?

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60 miles per hour.

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CCSS.6.RP.A.1

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If 5 apples cost $3, what is the cost per apple?

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$0.60 per apple.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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If a recipe calls for 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

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The ratio of flour to sugar is 2:3.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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What is the formula for finding a unit price?

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Unit Price = Total Price / Quantity.

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CCSS.6.RP.A.1

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