Percents and Percent Proportions

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

Front

How do you calculate the original price if you know the sale price and the percent of the original price?

Back

Divide the sale price by the percent (in decimal form). For example, if a car is sold for $12,000, which is 80% of its original price, the original price is $12,000 ÷ 0.80 = $15,000.

Front

What is the formula to find the percent decrease?

Back

Percent Decrease = ((Original Price - New Price) / Original Price) x 100.

Front

How do you find 15% of a number?

Back

Multiply the number by 0.15. For example, 15% of 150 is 150 x 0.15 = 22.5.

Front

What is the new price after a 20% discount on a $200 item?

Back

New Price = Original Price - (Original Price x Discount Rate). So, $200 - ($200 x 0.20) = $160.

Front

What does it mean to increase a number by a certain percent?

Back

To increase a number by a percent, multiply the number by the percent (in decimal form) and add that to the original number.

Front

If a person's salary is $5000 and they receive a 10% raise, how do you calculate the new salary?

Back

New Salary = Original Salary + (Original Salary x Raise Percentage). So, $5000 + ($5000 x 0.10) = $5500.

Front

What is the relationship between fractions and percents?

Back

Percents are a specific type of fraction where the denominator is always 100. For example, 25% is equivalent to 25/100.

Front

How do you convert a percent to a decimal?

Back

To convert a percent to a decimal, divide by 100. For example, 25% becomes 0.25.

Front

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

Back

Percent of a Number = (Percent x Number) / 100.