Proportions Review - Absent students

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 proportion?

Back

Two ratios form a proportion if the cross products are equal.

Front

What is the cross product of the ratios a/b and c/d?

Back

The cross product is ad and bc. If ad = bc, then a/b = c/d is a proportion.

Front

Solve the proportion: 2/3 = x/9. What is x?

Back

x = 6.

Front

If 4 out of 5 students passed a test, what is the ratio of students who passed?

Back

The ratio is 4:5.

Front

If 12 out of 20 homes have a personal computer, what is the proportion of homes with a computer?

Back

The proportion is 12/20 or 3/5.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply and then divide.

Front

If a 12-ounce shampoo bottle lasts 16 weeks, how long will an 18-ounce bottle last?

Back

24 weeks.

Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/d, then d = (b*c)/a.

Front

What does it mean if two ratios are not a proportion?

Back

It means that the cross products are not equal.