Lesson 3.3 Writing and Solving Proportions Practice

Front

What is a proportion?

Back

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

Front

How do you determine if two ratios form a true proportion?

Back

Cross-multiply the ratios. If the products are equal, the ratios form a true proportion.

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 and vice versa.

Front

If 4 DVDs cost $48, what is the cost of 1 DVD?

Back

The cost of 1 DVD is $12, calculated by dividing $48 by 4.

Front

How do you set up a proportion to find an unknown value?

Back

Front

Back

The value of x is 7.5.

Front

How do you solve for an unknown in a proportion?

Back

Cross-multiply and then isolate the variable to solve for it.

Front

What is the ratio of seventh-grade dancers to all dancers if it is 5:16?

Back

In a team of 80 dancers, the number of seventh-grade dancers is 25.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship or proportion between two quantities.

Front

How can you express a proportion in fraction form?

Back