Rates, Ratios & Proportions

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

CCSS.6.RP.A.2

Front

How do you convert gallons to cups?

Back

To convert gallons to cups, multiply the number of gallons by 16, since 1 gallon equals 16 cups.

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CCSS.6.RP.A.3D

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 do you determine if two ratios are proportional?

Back

Two ratios are proportional if their cross products are equal.

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CCSS.7.RP.A.2A

Front

What is the cost per unit?

Back

The cost per unit is the total cost divided by the number of units, giving the price for one unit.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If 4 pounds of bananas cost $6, what is the cost per pound?

Back

The cost per pound is $1.50, calculated by dividing $6 by 4.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the formula to find the total earnings based on a rate?

Back

Total earnings = (Earnings per time period) x (Number of time periods).

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CCSS.6.RP.A.3B

Front

How do you solve for x in an equation?

Back

To solve for x, isolate x on one side of the equation using inverse operations.

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CCSS.7.EE.B.4A

Front

What does it mean for ratios to be equivalent?

Back

Equivalent ratios are ratios that express the same relationship between numbers, even if the numbers themselves are different.

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CCSS.6.RP.A.3A

Front

How can you express a ratio in simplest form?

Back

To express a ratio in simplest form, divide both terms of the ratio by their greatest common divisor.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2