Percents

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 group that does not meet a certain criterion?

Back

To calculate the percent of a group that does not meet a certain criterion, subtract the number of individuals who meet the criterion from the total number of individuals, divide by the total number of individuals, and then multiply by 100.

Front

If 50% of a class are boys and there are 15 boys, how do you find the total number of students in the class?

Back

To find the total number of students, divide the number of boys by the percent of boys expressed as a decimal (0.50). So, 15 / 0.50 = 30 students.

Front

What does it mean if 25% of students earned an A in a class?

Back

It means that out of the total number of students, 25 out of every 100 students earned an A.

Front

How do you calculate the number of students who earned an A if 25% of 120 students earned an A?

Back

Multiply the total number of students by the percent expressed as a decimal: 120 * 0.25 = 30 students.

Front

How do you find the percent of questions answered correctly on a test?

Back

To find the percent of questions answered correctly, divide the number of correct answers by the total number of questions, then multiply by 100.

Front

If Joe answered 17 out of 20 questions correctly, what is the formula to find the percent correct?

Back

The formula is (Number of Correct Answers / Total Questions) * 100. So, (17 / 20) * 100 = 85%.

Front

What is the relationship between fractions and percents?

Back

Percents are a specific type of fraction where the denominator is 100. To convert a fraction to a percent, multiply by 100.

Front

How do you convert a percent to a decimal?

Back

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

Front

What is the formula for finding the percent increase or decrease?

Back

The formula for percent increase is ((New Value - Original Value) / Original Value) * 100. For percent decrease, it is ((Original Value - New Value) / Original Value) * 100.