Solving Proportions

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 terms and then solve for the variable.

Front

If a/b = c/d, what is the cross-multiplication method?

Back

The cross-multiplication method states that a*d = b*c.

Front

What is the unit rate?

Back

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

Front

If 4 ice creams cost $3.20, what is the cost of 1 ice cream?

Back

$0.80

Front

If a car travels 420 miles in 8 hours, what is its speed in miles per hour?

Back

The speed is 52.5 miles per hour.

Front

How do you find the total cost using proportions?

Back

Set up a proportion comparing the known cost to the unknown cost, then solve for the unknown.

Front

If one centimeter on a map represents 25 kilometers, how many kilometers does 3 centimeters represent?

Back

75 kilometers.

Front

What is the formula for finding distance using speed and time?

Back

Distance = Speed × Time.

Front

If a conveyor belt moves 10,800 packages in 1 hour, how many packages does it move in 1 minute?

Back

180 packages.