Percentages Review Flashcard

Front

What is a percentage?

Back

A percentage is a way of expressing a number as a fraction of 100. It is often used to compare proportions.

Front

How do you calculate a percentage of a number?

Back

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

Front

What does it mean if a price is discounted by a certain percentage?

Back

A discount means that the price is reduced by a certain percentage of the original price. For example, a 30% discount on a $60 item means you save $18.

Front

How do you find the original price after a discount?

Back

To find the original price after a discount, divide the sale price by (1 - discount rate). For example, if an item is $42 after a 30% discount, the original price is $42 / 0.70 = $60.

Front

What is the formula to find the percentage of a part compared to a whole?

Back

The formula is (part/whole) x 100%. For example, if there are 15 broken pencils out of 75, the percentage is (15/75) x 100% = 20%.

Front

If a number increases by a certain percentage, how do you find the new number?

Back

To find the new number after an increase, multiply the original number by (1 + percentage increase in decimal form). For example, a 20% increase on 50 is 50 x 1.20 = 60.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying by 100. For example, 1/4 = 0.25, which is 25%.

Front

How do you calculate the remaining percentage after using a gift card?

Back

To find the remaining percentage, subtract the percentage used from 100%. For example, if $40 is spent from a $50 gift card, the remaining amount is $10, which is 20% of the original value.

Front

What is 30% of 200?

Back

30% of 200 is calculated as 200 x 0.30 = 60.

Front

If 25 out of 100 students passed a test, what percentage passed?

Back

The percentage of students who passed is (25/100) x 100% = 25%.