Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Tags

CCSS.7.RP.A.2A

Front

How do you solve for x in a proportion?

Back

To solve for x in a proportion, cross-multiply and then isolate x.

Front

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

Back

The ratio of sugar to flour is 2:3.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

Tags

CCSS.6.RP.A.3A

Front

If 4/5 = x/20, what is the value of x?

Back

x = 16.

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

What is the relationship between equivalent ratios?

Back

Equivalent ratios represent the same relationship between quantities, even if the numbers are different.

Tags

CCSS.6.RP.A.3A

Front

How can you check if two ratios are equivalent?

Back

You can check if two ratios are equivalent by cross-multiplying and comparing the products.

Tags

CCSS.6.RP.A.3A

Front

If a car travels 60 miles in 1 hour, how far will it travel in 3 hours at the same speed?

Back

180 miles.

Tags

CCSS.6.RP.A.3B

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity of one.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If 3 apples cost $1.50, what is the cost of 1 apple?

Back

The cost of 1 apple is $0.50.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2