Proportions and Percents

Front

What is a proportion?

Back

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

Front

How do you find a percent of a number?

Back

To find a percent of a number, multiply the number by the percent (as a decimal). For example, to find 20% of 50, calculate 50 x 0.20 = 10.

Front

What is the formula to calculate the percent of a number?

Back

Percent = (Part/Whole) x 100.

Front

If 18 is 45% of a number, how do you find that number?

Back

Divide 18 by 0.45. The number is 40.

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together. It is often expressed as a quantity per one unit.

Front

How do you calculate the unit rate from a total cost?

Back

To find the unit rate, divide the total cost by the number of units. For example, $40 for 5 pounds of concrete gives a unit rate of $8 per pound.

Front

What does a discount mean?

Back

A discount is a reduction in the price of a product or service.

Front

How do you calculate the final price after a discount?

Back

Subtract the discount amount from the original price. For example, if a coat costs $76 and has a 35% discount, the discount is $26.60, making the final price $49.40.

Front

What is the meaning of 'percent paid' after a discount?

Back

It refers to the percentage of the original price that you actually pay after applying the discount.

Front

How do you calculate the amount spent from earnings?

Back

To find the amount spent, multiply the total earnings by the percent spent (as a decimal). For example, if Sarah earns $20 and spends 30%, she spends $6.