Ratios & 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 a proportion?

Back

To solve a proportion, cross-multiply the two ratios and set the products equal to each other.

Front

What is a unit rate?

Back

A unit rate is a ratio that compares a quantity to one unit of another quantity, often expressed as 'per'.

Front

If 3 pounds of meat cost $6, what is the cost per pound?

Back

The cost per pound is $2.

Front

How many miles can a family travel in 12 hours if they travel 75 miles per hour?

Back

They can travel 900 miles.

Front

If 4 bunches of grapes cost $10, how much do 10 bunches cost?

Back

10 bunches cost $25.

Front

What is the first step in solving a word problem involving ratios?

Back

Identify the quantities being compared and their relationship.

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

How do you find a missing value in a proportion?

Back

Set up the proportion and use cross-multiplication to solve for the missing value.