Percentages

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 * 0.20 = 10.

Front

What does it mean if a student scores 80% on a test?

Back

It means the student answered 80 out of 100 questions correctly, or scored 80 points out of a possible 100.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 75% becomes 0.75.

Front

What is 50% of 200?

Back

100

Front

If 30% of a class of 40 students are girls, how many girls are in the class?

Back

12 girls (30% of 40 = 0.30 * 40 = 12).

Front

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

Back

(Part/Whole) * 100 = Percentage.

Front

How do you find the total when given a percentage and the part?

Back

To find the total, divide the part by the percentage (in decimal form). For example, if 20 is 25% of a total, the total is 20 / 0.25 = 80.

Front

What is 120% as a decimal?

Back

1.20

Front

If a shirt costs $40 and is on sale for 25% off, what is the sale price?

Back

$30 (25% of $40 is $10, so $40 - $10 = $30).