Ratios and Proportions Review

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What is a ratio?

Back

A ratio is a comparison of two quantities that shows the relative size of one quantity to another, often expressed as 'a:b'.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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How do you simplify a ratio?

Back

To simplify a ratio, divide both terms by their greatest common divisor (GCD).

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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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

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How can you find an unknown in a proportion?

Back

You can find an unknown in a proportion by cross-multiplying and solving for the variable.

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CCSS.7.EE.B.3

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What is the cost per item?

Back

The cost per item is calculated by dividing the total cost by the number of items.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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If 7 prints cost $1.40, what is the cost of 1 print?

Back

The cost of 1 print is $1.40 ÷ 7 = $0.20.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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What is the ratio of cupcakes to cookies if 10 cupcakes and 20 cookies are sold?

Back

The ratio is 10:20, which simplifies to 1:2.

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CCSS.6.RP.A.1

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Front

How do you set up a proportion to solve a problem?

Back

Set up a proportion by creating a fraction for each ratio and setting them equal to each other.

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CCSS.7.RP.A.2C

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If x is 20 and y is 60 in a table, what is the relationship between x and y?

Back

The relationship can be expressed as a ratio or a function, depending on the context.

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How do you calculate the total cost for multiple items?

Back

Multiply the cost per item by the number of items.

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CCSS.7.EE.B.3