Percentages Review Part 3

Front

What is a percentage?

Back

A percentage is a fraction expressed as a part of 100. It represents how much of a whole is being considered.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 20% of 65, calculate 65 * 0.20 = 13.

Front

What is the formula to find the total when given a percentage and a part?

Back

The formula is: Total = Part / (Percentage in decimal form). For example, if 660 points is 75%, then Total = 660 / 0.75 = 880.

Front

How do you convert a decimal to a percentage?

Back

To convert a decimal to a percentage, multiply the decimal by 100 and add a percent sign. For example, 0.056 * 100 = 5.6%.

Front

What does it mean if a number represents a certain percentage of a total?

Back

It means that the number is a part of the whole, and the percentage indicates how much of the whole that part represents.

Front

How can you find what percentage one number is of another?

Back

To find what percentage one number (part) is of another number (whole), use the formula: (Part / Whole) * 100. For example, (16 / 20) * 100 = 80%.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by dividing the numerator by the denominator and then multiplying by 100. For example, 1/4 = (1 ÷ 4) * 100 = 25%.

Front

How do you find the percentage increase or decrease?

Back

To find the percentage increase, use the formula: ((New Value - Old Value) / Old Value) * 100. For decrease, use: ((Old Value - New Value) / Old Value) * 100.

Front

What is the significance of 100% in terms of whole numbers?

Back

100% represents the whole or total amount. Any percentage above 100% indicates a value greater than the whole.

Front

How do you calculate the total enrollment of a school if a certain number represents a percentage of it?

Back

Use the formula: Total Enrollment = Number / (Percentage in decimal form). For example, if 45 boys represent 5%, then Total Enrollment = 45 / 0.05 = 900.