Front

What is a ratio?

Back

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

Front

What is a proportion?

Back

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

Front

How do you simplify a ratio?

Back

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

Front

What does it mean for two quantities to be proportional?

Back

Two quantities are proportional if they maintain a constant ratio or rate.

Front

If the ratio of boys to girls in a class is 3:4, how many boys are there if there are 28 girls?

Back

There are 21 boys. (3/4 = x/28; x = 21)

Front

What is the cross-multiplication method used for?

Back

Cross-multiplication is used to determine if two ratios are proportional by multiplying the outer and inner terms.

Front

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

Back

The ratio of flour to sugar is 2:3.

Front

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

Back

If a/b = c/d, then ad = bc, where a, b, c, and d are the values in the proportion.

Front

How can you represent a ratio in fraction form?

Back

A ratio can be represented as a fraction by placing the first quantity over the second quantity.

Front

What is an example of a non-proportional relationship?

Back

An example of a non-proportional relationship is when the ratio of distance to time changes, such as driving at varying speeds.