Ratios, Rates, & Unit Rates

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What is a ratio?

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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?

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A rate is a specific kind of ratio that compares two different kinds of quantities, often expressed as a quantity per unit of another quantity.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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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 of different rates.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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

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To calculate the cost per pound, divide the total cost of the item by its weight in pounds.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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What is a complex fraction?

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A complex fraction is a fraction that has a fraction or mixed number in the numerator or denominator or both.

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How do you determine which item is a better buy?

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To determine the better buy, calculate the unit price (cost per item or cost per unit) for each option and compare them.

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CCSS.6.RP.A.3B

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Back

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CCSS.7.RP.A.1

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What is the formula for calculating a rate?

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Rate = Total Quantity / Time Period.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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Back

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CCSS.7.RP.A.1

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What is the relationship between ratios and proportions?

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Ratios compare two quantities, while proportions state that two ratios are equal.

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CCSS.6.RP.A.3A