Ratios and Proportions

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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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How do you simplify a ratio?

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To simplify a ratio, divide both terms by their greatest common factor (GCF).

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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 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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What is the ratio of red LEGOS to yellow LEGOS if there are 3 red and 6 yellow?

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The ratio is 1:2.

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If a class has 30 students and 18 are boys, how many girls are there?

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There are 12 girls.

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What is the ratio of boys to girls in a class of 30 students with 18 boys?

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The ratio is 3:2.

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How do you determine which is the better deal between two products?

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Calculate the price per unit (e.g., per ounce) for each product and compare.

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CCSS.6.RP.A.3B

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If Doritos cost $4.39 for 11.5 oz, what is the price per ounce?

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The price per ounce is approximately $0.38.

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If Cheetos cost $2.24 for 9.75 oz, what is the price per ounce?

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The price per ounce is approximately $0.23.

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