Best Buy: Unit Rates

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities where one of the quantities is expressed as a quantity of one. It is often used to determine the cost per item or the rate of consumption.

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How do you calculate the unit rate from a total cost and quantity?

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To calculate the unit rate, divide the total cost by the total quantity. For example, if 8 apples cost $5.20, the unit rate is $5.20 ÷ 8 = $0.65 per apple.

Front

What is the formula for finding the best deal when comparing prices?

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To find the best deal, calculate the unit price for each option by dividing the total price by the quantity. The option with the lowest unit price is the best deal.

Front

If 27 ounces of nacho chips cost $3.51 and 10 ounces cost $1.30, how do you determine which is the better deal?

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Calculate the unit price for each: 27 ounces = $3.51 ÷ 27 = $0.13 per ounce; 10 ounces = $1.30 ÷ 10 = $0.13 per ounce. Since both have the same unit price, neither is a better deal.

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What is the unit price of 200g of lollies that cost $1.65?

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The unit price is calculated as $1.65 ÷ 200g = $0.00825 per gram.

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How do you compare gas mileage between two cars?

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To compare gas mileage, calculate the miles per gallon (MPG) for each car by dividing the miles driven by the gallons used. The car with the higher MPG is more fuel-efficient.

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If Ms. Salemi's Volvo gets 120 miles on 5 gallons, what is its gas mileage?

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The gas mileage is calculated as 120 miles ÷ 5 gallons = 24 miles per gallon.

Front

What is the cost of one dozen crabs if 2 1/2 dozen cost $75?

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To find the cost of one dozen, first convert 2 1/2 dozen to a fraction: 2.5 dozen = 2.5 x 12 = 30 crabs. Then, $75 ÷ 2.5 = $30 per dozen.

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What is the significance of unit rates in real-life applications?

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Unit rates help consumers make informed decisions by allowing them to compare prices and quantities effectively, ensuring they get the best value for their money.

Front

How can you determine if a deal is worth it when comparing different quantities?

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Always convert the prices to a common unit (e.g., price per ounce, price per item) to make an accurate comparison.