Ratios and Proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, expressed as 'a:b' or 'a/b'.

Tags

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

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown.

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CCSS.7.RP.A.2C

Front

What is the ratio of boys to girls in a class of 30 students with 18 boys?

Back

3:2

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If 20 is to 11 as 60 is to x, what is x?

Back

x = 12.

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CCSS.7.RP.A.2B

Front

What is the simplest form of the ratio 18:12?

Back

3:2.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How do you determine which is the better deal between two products?

Back

Calculate the price per unit for each product and compare.

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CCSS.6.RP.A.3B

Front

If a recipe calls for a ratio of 2:3 of sugar to flour, how much sugar is needed for 6 cups of flour?

Back

4 cups of sugar.

Front

What does it mean to reduce a ratio to its lowest terms?

Back

To reduce a ratio to its lowest terms means to divide both terms by their greatest common factor.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If the ratio of cats to dogs is 4:5, how many dogs are there if there are 16 cats?

Back

20 dogs.