In this guide, we will explore how to calculate what percent of 100 is 20, along with the percentage formula and an example calculation. Understanding percentages is a fundamental skill that can be useful in many areas of life, from mathematics to finance.
Before we delve into the calculation, let’s briefly define what a percentage is. The word “percent” comes from the Latin word “per centum”, which means “per hundred”. So when we talk about a percentage, we are referring to a fraction of the whole.
In the case of finding out what percent of 100 is 20, we want to determine how many pieces of the whole number 100 make up the number 20. By converting the fraction 20/100 into a percentage, we can conclude that 20% of 100 is equal to 20.
To calculate a percentage, we can use the following formula: Percentage = (Value/Total Value) x 100. This formula applies to various situations where we need to find the percentage of one value in relation to another.
Now that we have a basic understanding of percentages and the formula for calculating them, let’s dive deeper into the topic and explore more examples and applications.
Key Takeaways:
 Percentages refer to a fraction of the whole expressed as a part of 100.
 The formula to calculate a percentage is Percentage = (Value/Total Value) x 100.
 In the example of finding out what percent of 100 is 20, 20% of 100 is equal to 20.
 Percentages are widely used in mathematics, finance, and everyday life.
 Understanding percentages is essential for various calculations and problemsolving scenarios.
Understanding Percentages
Percentages are a fundamental concept that allows us to express a parttowhole relationship in terms of a fraction of 100. The word “percent” derives from the Latin phrase “per centum,” meaning “per hundred.” When we say that a certain percentage of something is a particular value, we are essentially stating that we have a certain number of pieces out of a possible 100. Percentages can represent fractions, decimals, and proportions, and they have widespread applications in various fields such as mathematics, finance, and everyday life.
“Percentages are a powerful tool for understanding and comparing quantities. They provide insights into relative proportions and allow for meaningful comparisons.”
Percentage calculations are essential for analyzing data, making financial decisions, and interpreting statistical information. They help us comprehend the relationship between parts and wholes, enabling us to quantify and communicate relative values effectively.
Percentage Formula
Understanding how to calculate percentages is essential in various scenarios. The percentage formula is a simple yet powerful tool to determine the relative value of one quantity in relation to another. By applying this formula, we can quickly calculate percentages in a wide range of situations.
The percentage formula is as follows:
Percentage = (Value/Total Value) x 100
Let’s break it down:
 Value: The specific number or quantity for which we want to find the percentage.
 Total Value: The total or whole number against which we are comparing the value. It represents the reference point for calculating the percentage.
To calculate the percentage, we divide the value by the total value and then multiply the result by 100. This multiplication by 100 is necessary to express the percentage as a number out of 100.
For example, suppose we want to determine what percentage 25 is of 50. Applying the formula, we have:
Percentage = (25/50) x 100 = 0.5 x 100 = 50%
In this instance, 25 is 50% of 50.
The percentage formula can be applied to various scenarios, such as calculating discounts, proportions, growth rates, and many more. Its versatility makes it an essential tool in everyday life, finance, and other fields where relative comparisons matter.
Example:
Let’s use the percentage formula to calculate the percentage of 80 out of 200:
Value  Total Value  Percentage 

80  200  (80/200) x 100 = 40% 
How to Calculate Percentage
Calculating percentages is an essential skill for various applications, from financial planning to data analysis. To calculate a percentage accurately, follow these simple steps:

Divide the value you want to find the percentage of by the total value.

Multiply the result by 100 to get the percentage.
Let’s look at an example to illustrate the process. Suppose we want to find the percentage of 20 out of 100. We divide 20 by 100:
20 รท 100 = 0.2
Next, we multiply the result by 100:
0.2 x 100 = 20%
Therefore, 20 is 20% of 100.
This method can be applied in various situations involving percentage calculations. Whether you’re determining a discount, calculating a tip, or analyzing data, these steps will guide you through the process.
Percentage Difference
The percentage difference is a valuable measure used to determine the change or variation between two values expressed as a percentage. This calculation is particularly useful when comparing data or assessing relative changes.
The formula to calculate the percentage difference is:
Percentage Difference = (N1 – N2 / [(N1 + N2) / 2]) x 100
This formula calculates the absolute difference between two values, divides it by the average of the two values, and then multiplies by 100 to obtain the percentage difference.
By utilizing this formula, we determine the percentage change between the two values, enabling us to evaluate the magnitude and direction of the difference. It allows us to understand how much one value has changed compared to the other, in relative terms.
For example, let’s consider the case of comparing N1 and N2:
 Take the absolute difference between N1 and N2: N1 – N2
 Calculate the average of N1 and N2: [(N1 + N2) / 2]
 Divide the absolute difference by the average: N1 – N2 / [(N1 + N2) / 2]
 Multiply the result by 100 to obtain the percentage difference: (N1 – N2 / [(N1 + N2) / 2]) x 100
This calculation offers valuable insights into the comparison of data sets, allowing us to determine the relative change and better understand the variations between values. It is a powerful tool in various fields, including finance, economics, statistics, and scientific research.
Visual representation of data through tables is a useful way to enhance understanding. Let’s analyze a theoretical example:
Year  Value A  Value B  Percentage Difference 

2018  50  75  50% 
2019  80  120  33.33% 
In this example, we can see that the percentage difference between Value A and Value B was 50% in 2018, indicating a significant variation. However, in 2019, the percentage difference decreased to 33.33%, suggesting a relatively smaller change. Analyzing such data can provide valuable insights into trends and changes over time.
Key Takeaways:
 The percentage difference measures the change or variation between two values expressed as a percentage.
 It is calculated using the formula: Percentage Difference = (N1 – N2 / [(N1 + N2) / 2]) x 100.
 This calculation helps in comparing data sets, understanding the relative change, and evaluating variations.
 Tables can visually represent data, making it easier to analyze and draw conclusions.
Percentage Increase and Decrease
Percentage increase and decrease are essential concepts used to measure the amount of change between two values, expressed as a percentage. These calculations offer valuable insights when analyzing data and making comparisons. Let’s dive into how these formulas work.
Percentage Increase
To calculate the percentage increase, follow these steps:
 Subtract the original value from the new value.
 Divide the result by the original value.
 Multiply the quotient by 100.
For example, if the original value is 50 and the new value is 75, the calculation would be as follows:
(75 – 50) / 50 * 100 = 50%
In this case, the percentage increase is 50%.
Percentage Decrease
To calculate the percentage decrease, use the same steps as the percentage increase formula, but subtract the new value from the original value.
Continuing with the previous example, let’s calculate the percentage decrease:
(50 – 75) / 50 * 100 = 33.33%
In this case, the percentage decrease is 33.33%.
Using these formulas, you can quantify the change between two values in percentage terms, providing valuable insights for data analysis, business reports, and other comparisons.
Understanding how to calculate percentages is crucial in various scenarios, whether you’re analyzing data, solving mathematical problems, or determining proportions. The example above illustrates a simple percentage calculation, where we find the percentage of one value in relation to another value. In this case, we wanted to find the percentage that 20 represents out of 100.
By applying the formula and following the steps, you can calculate percentages accurately and efficiently. This example serves as a practice exercise and demonstrates the practical application of percentage calculations.
Fraction to Percentage Conversion
Converting a fraction to a percentage is a straightforward process. To convert a fraction to a percentage, we follow these steps:
 Divide the numerator by the denominator.
 Multiply the result by 100.
 Add the percentage symbol (%) to the end.
For example, let’s convert the fraction 1/2 to a percentage:
 Divide the numerator (1) by the denominator (2), which gives us 0.5.
 Multiply 0.5 by 100 to get 50.
 Lastly, add the percentage symbol to the end, resulting in 50%.
This method can be used to convert any fraction to a percentage. It is especially helpful when we need to express fractions as percentages in various contexts, such as finance, statistics, and everyday life.
Fraction  Percentage 

1/2  50% 
3/4  75% 
2/5  40% 
7/8  87.5% 
5/6  83.33% 
Percentage vs Per Cent
The terms “percentage” and “per cent” are often used interchangeably and refer to the same concept. Both terms indicate a value expressed in relation to a whole of 100. However, “percentage” is the more commonly used term in everyday language and in mathematical contexts. “Per cent” is a less common spelling variant, primarily used in British English. The choice between the two terms is a matter of personal preference and regional conventions.
Percentage in Maths
Percentages are an integral part of mathematics and play a crucial role in various mathematical concepts and applications. They are commonly used in calculations involving ratios, proportions, rates, and statistics.
In financial mathematics, percentages are used to calculate interest rates, discounts, and investments. In geometry, percentages are used to solve problems related to areas, volumes, and angles. Algebraic equations often involve percentages as well, where they are used to represent unknown quantities or variables.
Understanding percentages is essential for building a strong foundation in mathematics. It enables us to solve realworld problems that involve proportionality and comparisons of quantities. Whether it’s determining the percentage increase or decrease in a value, expressing fractions as percentages, or analyzing statistical data, the knowledge of percentages is indispensable in mathematical applications.
FAQ
What does “percent” mean?
“Percent” means “per hundred”. It represents a fraction of the whole, with 100 as the base.
What is the formula to calculate a percentage?
The formula is Percentage = (Value/Total Value) x 100. This formula is used to determine the percentage of one value in relation to another value.
How do I calculate a percentage?
Divide the value you want to find the percentage of by the total value, and then multiply the result by 100.
What is the percentage difference?
The percentage difference measures the change or variation between two values expressed as a percentage.
How do I calculate the percentage increase and decrease?
To calculate the percentage increase, subtract the original value from the new value, divide the result by the original value, and multiply by 100. To calculate the percentage decrease, do the same but subtract the new value from the original value.
How do I find out what percent of 100 is 20?
Divide 20 by 100 and multiply the result by 100. Therefore, 20 is 20% of 100.
How do I convert a fraction to a percentage?
Divide the numerator by the denominator, multiply the result by 100, and add the percentage symbol.
What is the difference between “percentage” and “per cent”?
Both terms refer to the same concept of a value expressed in relation to a whole of 100. “Percentage” is more commonly used, while “per cent” is a less common spelling variant.
How are percentages used in mathematics?
Percentages are used in various mathematical concepts and applications, including ratios, proportions, rates, statistics, financial mathematics, geometry, algebra, and problemsolving.