Ratios, Rates, & Proportions

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What is a ratio?

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

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What is a rate?

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

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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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How do you find the unit rate?

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To find the unit rate, divide the total amount by the number of items, ensuring the amount is on top.

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If 4 bars of soap cost $5, how much do 8 bars cost?

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$10

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What is the unit price of a 7-pack of DVDs that costs $23.31?

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$3.33 per DVD

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If 19 dollars buys 7 books, what is the cost per book?

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$2.71 per book

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If 16 dollars buys 5 books, what is the cost per book?

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$3.20 per book

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How many students are in each class if there are 88 students for 4 classes?

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22 students per class

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What is the formula to find a unit rate?

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Unit Rate = Total Amount / Number of Items.

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