Ratios and Proportions 7th Grade

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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 to b' or 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

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

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How do you solve a proportion?

Back

To solve a proportion, cross-multiply and then divide to find the unknown value.

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CCSS.7.RP.A.2C

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What is the ratio of boys to girls if there are 5 boys and 7 girls?

Back

7 to 5.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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If a recipe calls for 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

2:3.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the simplest form of the ratio 40:60?

Back

2:3.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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If there are 10 soccer players and 3 coaches, what is the ratio of coaches to players?

Back

3:10.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the cost of 4 organic rotisserie chickens if one costs $9.99?

Back

$39.96.

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CCSS.7.EE.B.3

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How do you express the ratio of 3 apples to 6 oranges in simplest form?

Back

1:2.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2