Rates/Unit Rates/Better Buy

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What is a rate?

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A rate is a ratio that compares two different quantities, often with different units, such as miles per hour or words per minute.

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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 1. For example, if a car travels 60 miles in 1 hour, the unit rate is 60 miles per hour.

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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. For example, if you have 120 miles in 2 hours, the unit rate is 120 ÷ 2 = 60 miles per hour.

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If a person can type 408 words in 4 minutes, how many words can they type in 1 minute?

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102 words per minute.

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What is the unit rate of a train that travels 1,230 miles in 5 hours?

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246 miles per hour.

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What does it mean to find the better buy?

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Finding the better buy involves comparing the unit prices of two or more products to determine which one offers more value for the money.

Front

If Oreos cost $2.98 for 15 oz, what is the unit price per ounce?

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The unit price is $2.98 ÷ 15 oz = $0.1993 per ounce.

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If Chips Ahoy cost $2.50 for 14 oz, what is the unit price per ounce?

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The unit price is $2.50 ÷ 14 oz = $0.1786 per ounce.

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Which is the better deal: Oreos for $2.98 for 15 oz or Chips Ahoy for $2.50 for 14 oz?

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Chips Ahoy is the better deal.

Front

What is the formula to solve for x in a proportion?

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