Equivalent Ratios/Proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.

Front

How do you simplify a ratio?

Back

To simplify a ratio, divide both terms by their greatest common divisor (GCD).

Front

What is an equivalent ratio?

Back

Equivalent ratios are ratios that express the same relationship between two quantities, even if the numbers are different.

Front

If the ratio of red cars to yellow cars is 1:3, how many yellow cars are there if there are 2 red cars?

Back

There are 6 yellow cars.

Front

What is a proportion?

Back

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

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply and then divide to find the unknown value.

Front

If 88 students are divided into 4 classes, how many students are in each class?

Back

22 students per class.

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 boys to girls in a class is 2:3, how many girls are there if there are 10 boys?

Back

There are 15 girls.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between the quantities.