Ratio and Proportions

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 solve for x in a ratio?

Back

To solve for x in a ratio, set up a proportion and cross-multiply to find the value of x.

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity per one unit of another quantity.

Front

If 4 : n = 6 : 9, what is n?

Back

n = 6.

Front

How do you find the missing value in a proportion?

Back

To find the missing value in a proportion, use cross-multiplication.

Front

What is the formula for finding a unit rate?

Back

Unit Rate = Total Quantity / Number of Units.

Front

If 405 rotations occur in 5 minutes, how many rotations occur in 1 minute?

Back

81 rotations per minute.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

Front

How can you express a ratio in simplest form?

Back

To express a ratio in simplest form, divide both terms by their greatest common divisor.