Percents

Front

What is a percent?

Back

A percent is a way to express a number as a fraction of 100. It is denoted by the symbol '%'. For example, 45% means 45 out of 100.

Front

How do you calculate the percent of a part compared to a whole?

Back

To calculate the percent of a part compared to a whole, use the formula: (Part/Whole) x 100. For example, if there are 90 non-fiction books out of 200 total books, the percent of non-fiction books is (90/200) x 100 = 45%.

Front

What is 50% of a number?

Back

50% of a number is half of that number. For example, 50% of 20 is 10.

Front

How do you find the percent of a total?

Back

To find the percent of a total, divide the part by the total and multiply by 100. For example, if there are 4 girls in a class of 16, the percent of girls is (4/16) x 100 = 25%.

Front

What does it mean if 65% of students buy lunch?

Back

It means that out of every 100 students, 65 students buy lunch. To find out how many do not buy lunch, subtract 65 from 100, which is 35 students.

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 multiply by 100. For example, 1/4 = (1 ÷ 4) x 100 = 25%.

Front

What is 150% of $20?

Back

150% of $20 is $30. This is calculated by multiplying $20 by 1.5 (which is 150% expressed as a decimal).

Front

If a class has 16 students and 4 are girls, what percent are boys?

Back

If there are 4 girls in a class of 16, then there are 12 boys. The percent of boys is (12/16) x 100 = 75%.

Front

What is the formula to find the percent increase?

Back

The formula to find the percent increase is: ((New Value - Original Value) / Original Value) x 100.

Front

What is the formula to find the percent decrease?

Back

The formula to find the percent decrease is: ((Original Value - New Value) / Original Value) x 100.