Rates, Ratios, proportions and percents

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

What is a rate?

Back

A rate is a specific kind of ratio that compares two different units, such as miles per hour or price per item.

Front

What is a unit rate?

Back

A unit rate is a rate in which the second quantity is one unit, such as 50 miles per 1 hour.

Front

What is a proportion?

Back

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

Front

How do you find a unit price?

Back

To find the unit price, divide the total price by the number of items.

Front

If 5 apples cost $2.50, what is the cost of one apple?

Back

$0.50

Front

What does it mean if two quantities are proportional?

Back

It means that as one quantity changes, the other quantity changes at a constant rate.

Front

How can you tell if a table of values is proportional?

Back

A table is proportional if the ratios of corresponding values are equal.

Front

What is the formula for finding a percentage?

Back

Percentage = (Part/Whole) x 100.

Front

If you have 30% of a number, how do you find the number?

Back

Divide the part by the percentage (in decimal form) to find the whole.