Percent Problems

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100. It is denoted by the symbol '%'. For example, 50% means 50 out of 100.

Front

How do you calculate the percent grade on a test?

Back

To calculate the percent grade, divide the number of correct answers by the total number of questions, then multiply by 100. For example, if you got 12 out of 15 questions right: (12/15) * 100 = 80%.

Front

What is 30% of $20?

Back

To find 30% of $20, multiply 20 by 0.30. So, 20 * 0.30 = $6.

Front

How do you find the number of students that meet a certain percentage in a group?

Back

Multiply the total number of students by the percentage (in decimal form). For example, if 75% of 20 students are 60 inches or taller: 20 * 0.75 = 15 students.

Front

What is the formula to find what percent one number is of another?

Back

The formula is: (part/whole) * 100. For example, to find what percent 12 is of 600: (12/600) * 100 = 2%.

Front

If 78% of questions are answered correctly on a test of 50 questions, how many questions were answered incorrectly?

Back

First, find the number of correct answers: 50 * 0.78 = 39 correct. Then, subtract from the total: 50 - 39 = 11 incorrect.

Front

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

Back

It means the student answered 80 out of every 100 questions correctly, or in a specific case, they got 80% of the total questions right.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the top number (numerator) by the bottom number (denominator) and then multiply by 100. For example, 1/4 = (1 ÷ 4) * 100 = 25%.

Front

What is the relationship between percentages, fractions, and decimals?

Back

Percentages are fractions with a denominator of 100. To convert a percentage to a decimal, divide by 100. For example, 25% = 25/100 = 0.25.

Front

How do you find the total amount if you know the percent and the part?

Back

To find the total amount, divide the part by the percent (in decimal form). For example, if $6 is 30% of the total, then total = 6 / 0.30 = $20.