Ratios, Rates, & Proportions. Oh My!

Front

What is a ratio?

Back

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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CCSS.6.RP.A.1

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How do you calculate a rate?

Back

A rate is calculated by dividing one quantity by another, typically with different units, such as speed (distance/time).

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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

If Justin types 408 words in 4 minutes, how many words does he type per minute?

Back

102 words per minute.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

Which is the better buy: A 4 pack of t-shirts for $2.24 or a 6-pack for $3.12?

Back

A 6-pack of t-shirts for $3.12 is the better buy.

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CCSS.6.RP.A.3B

Front

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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Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

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CCSS.7.G.A.1

Front

If 4 pounds of ham costs $19.00, what is the cost per pound?

Back

The cost per pound is $4.75.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the relationship between ratios and fractions?

Back

Ratios can be expressed as fractions, where the first quantity is the numerator and the second is the denominator.

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CCSS.6.RP.A.1

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Front

How do you solve a proportion?

Back

Cross-multiply and then solve for the unknown variable.

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CCSS.7.RP.A.2C