Percent Proportions

Front

What is a percent proportion?

Back

A percent proportion is a way to express a part of a whole as a percentage. It is often used to compare a part to the total and is calculated by dividing the part by the whole and multiplying by 100.

Front

How do you calculate the percentage of a number?

Back

To calculate the percentage of a number, divide the part by the whole and then multiply by 100. For example, to find 20% of 50, calculate (20/100) * 50 = 10.

Front

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

Back

The formula is: Part = (Percent/100) * Whole. For example, if you want to find 30% of 200, it would be (30/100) * 200 = 60.

Front

If 25% of a class of 40 students are girls, how many girls are in the class?

Back

10 girls. (25/100) * 40 = 10.

Front

What is the relationship between percent, part, and whole?

Back

The relationship is expressed as: Percent = (Part/Whole) * 100. This shows how the part compares to the whole in terms of percentage.

Front

How do you convert a fraction to a percentage?

Back

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

Front

What is the percent increase formula?

Back

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

Front

If a shirt costs $40 and is on sale for $30, what is the percent decrease in price?

Back

The percent decrease is 25%. [(40 - 30) / 40] * 100 = 25%.

Front

How do you find the total when given the part and percent?

Back

Use the formula: Total = Part / (Percent/100). For example, if 30 is 60% of a total, then Total = 30 / (60/100) = 50.

Front

What is a sales tax?

Back

Sales tax is a percentage of the sale price that is added to the cost of a product or service, usually collected by the seller.