7.AR.3.2_Ratios 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

How do you find the cost per item?

Back

To find the cost per item, divide the total cost by the number of items.

Front

If 5 apples cost $3.00, what is the cost per apple?

Back

$0.60 per apple.

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

Cross-multiply the two ratios and set the products equal to each other.

Front

If 12 oranges cost $3.60, how much would 30 oranges cost?

Back

$9.00.

Front

What is the unit rate?

Back

The unit rate is a ratio that compares a quantity to one unit of another quantity.

Front

If a car travels 240 miles in 4 hours, what is the speed in miles per hour?

Back

60 miles per hour.

Front

How do you set up a proportion to solve for an unknown?

Back

Set up the equation as a/b = c/d, where a and b are known values, and c is the unknown.

Front

If 3 pounds of apples cost $6, how much do 5 pounds cost?

Back

$10.