Solving Proportions

Front

What is a proportion?

Back

A proportion is when two ratios are equivalent and show the same value.

Front

If the ratio of brownies to cookies is 3:5 and there are 75 cookies, how many brownies are there?

Back

45 brownies.

Front

How do you determine if two ratios form a proportion?

Back

Two ratios form a proportion if they can be simplified to the same value.

Front

Are the ratios 2:3 and 4:6 proportional?

Back

Yes, they are proportional because they simplify to the same value.

Front

What is the first step in solving a proportion?

Back

Cross-multiply the two ratios.

Front

If a:b = 3:4, what is the value of a when b = 20?

Back

a = 15.

Front

What does it mean for two ratios to be equivalent?

Back

It means they represent the same relationship or value.

Front

If 5:10 is a ratio, what is its simplest form?

Back

1:2.

Front

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

Back

If a/b = c/d, then ad = bc.

Front

If the ratio of apples to oranges is 2:3 and there are 12 oranges, how many apples are there?

Back

8 apples.