Unit 3A Ratios and Proportions Test

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What is a ratio?

Back

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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CCSS.6.RP.A.1

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How do you simplify a ratio?

Back

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

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CCSS.6.RP.A.1

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Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

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CCSS.7.RP.A.2A

Front

How can you determine if two ratios form a proportion?

Back

Cross-multiply the ratios. If the products are equal, the ratios form a proportion.

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CCSS.7.RP.A.2A

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What is the unit rate?

Back

The unit rate is a ratio that compares a quantity to one unit of another quantity.

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CCSS.6.RP.A.1

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How do you find the unit price?

Back

To find the unit price, divide the total price by the number of units.

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CCSS.6.RP.A.1

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What is the constant rate in a proportional relationship?

Back

The constant rate is the ratio that remains the same throughout the relationship.

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CCSS.7.RP.A.2B

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How do you express a ratio as a fraction?

Back

A ratio can be expressed as a fraction by placing the first quantity over the second quantity.

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CCSS.6.RP.A.1

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Front

What is the ratio of boys to girls if there are 6 boys and 12 girls?

Back

The ratio of boys to girls is 1/2.

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CCSS.6.RP.A.1

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Front

If Becca walked 3 miles in 48 minutes, how do you find her walking rate?

Back

Convert 48 minutes to hours (0.8 hours) and divide 3 miles by 0.8 hours to get 3.75 miles per hour.

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CCSS.6.RP.A.1

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