7.1 - 7.4 Review of Percents - Pre Algebra

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 percent of a number?

Back

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

Front

What is the formula to find the original price when given a sale price and percent discount?

Back

Original Price = Sale Price / (1 - Discount Rate). For example, if a shirt is sold for $15 at 80% of the original price, the original price is $15 / 0.80 = $18.75.

Front

If 8% of seats in a stadium are not occupied, what percent of seats are occupied?

Back

92% of the seats are occupied (100% - 8% = 92%).

Front

How do you find the number of people who attended an event if you know the total capacity and the percent occupied?

Back

Multiply the total capacity by the percent occupied (in decimal form). For example, if a stadium holds 42,500 and 92% are occupied, then 42,500 * 0.92 = 39,100.

Front

What is 63% of 150?

Back

63% of 150 is 94.5 (150 * 0.63 = 94.5).

Front

If 40% of a number is 36, how do you find that number?

Back

To find the number, divide 36 by 0.40. So, the number is 36 / 0.40 = 90.

Front

What does it mean if a price is marked down by a certain percent?

Back

It means that the price has been reduced by that percent from its original price.

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 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.