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 4/5 = x/20, what is x?

Back

x = 16.

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 a car travels 150 miles in 3 hours, what is its speed in miles per hour?

Back

Speed = Distance/Time = 150 miles / 3 hours = 50 miles per hour.

Front

What is the cost per item if 10 items cost $30?

Back

Cost per item = Total cost / Number of items = $30 / 10 = $3.

Front

If 6 oranges cost $3, how much do 10 oranges cost?

Back

Cost of 10 oranges = (10/6) * $3 = $5.

Front

What is the formula for finding the total cost based on unit price and quantity?

Back

Total Cost = Unit Price x Quantity.

Front

If 5 pounds of apples cost $10, how much do 8 pounds cost?

Back

Cost of 8 pounds = (8/5) * $10 = $16.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.