Unit 5 Flashcard #2 Practice (Proportions)

Front

What is a proportion?

Back

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

Front

How do you convert seconds to minutes?

Back

To convert seconds to minutes, divide the number of seconds by 60.

Front

What is the formula to calculate a percentage discount?

Back

To calculate a percentage discount, multiply the original price by the discount rate (as a decimal) and subtract that amount from the original price.

Front

If a baseball bat costs $28 and there is a 25% discount, what is the discount amount?

Back

The discount amount is $7.00.

Front

What is the total cost of an item after applying a 25% discount on a $28 item?

Back

The total cost is $21.00.

Front

How do you find the actual length of an object from a scale drawing?

Back

Multiply the length in the drawing by the scale factor.

Front

If the scale is 1 inch : 2 feet, how many feet does 5 inches represent?

Back

5 inches represents 10 feet.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions state that two ratios are equal.

Front

How do you solve for an unknown in a proportion?

Back

Cross-multiply the known values and then solve for the unknown.

Front

What is the value of x in the proportion 15/x = 3/12?

Back

x = 60.