Percent Proportions

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 number?

Back

To calculate the percent of a number, divide the part by the whole and then multiply by 100. Formula: (Part/Whole) x 100.

Front

What is the formula to find the whole when given a part and a percent?

Back

Whole = Part / (Percent / 100). This formula rearranges the percent formula to solve for the whole.

Front

If 20 is 40% of a number, how do you find that number?

Back

To find the number, use the formula: Number = Part / (Percent / 100). In this case, Number = 20 / (40 / 100) = 50.

Front

What is the relationship between fractions and percents?

Back

Percents can be converted to fractions by placing the percent over 100 and simplifying. For example, 25% = 25/100 = 1/4.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and multiply by 100. For example, 1/4 = 0.25 x 100 = 25%.

Front

What is the percent increase formula?

Back

Percent Increase = [(New Value - Original Value) / Original Value] x 100.

Front

What is the percent decrease formula?

Back

Percent Decrease = [(Original Value - New Value) / Original Value] x 100.

Front

How do you find what percent one number is of another?

Back

To find what percent one number is of another, use the formula: (Part/Whole) x 100.

Front

What is 50% of a number?

Back

50% of a number is half of that number. For example, 50% of 150 is 75.