Percent Proportions and Equations

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 find the percent of a number, multiply the number by the percent (in decimal form) and then divide by 100.

Front

What is the formula for finding the total when given a part and a percent?

Back

Total = Part / (Percent / 100).

Front

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

Back

Number = 20 / 0.40 = 50.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you set up a proportion to solve for an unknown?

Back

Set up the equation as a/b = c/d, where a, b, c, and d are known values, and solve for the unknown.

Front

What is the relationship between fractions and percents?

Back

Percents can be converted to fractions by placing the percent over 100 and simplifying.

Front

How do you find the percent increase or decrease?

Back

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

Front

What is a free throw percentage in basketball?

Back

Free throw percentage is calculated by dividing the number of successful free throws by the total number of attempts, then multiplying by 100.

Front

If Sarah spent 30% of her earnings, how do you calculate the amount spent?

Back

Amount Spent = Total Earnings x (Percent / 100).