Have you ever been faced with a math problem that requires you to find the percentage of two numbers? Perhaps you’re trying to calculate the markup on a product, or you need to figure out the percentage of a grade earned on a test. Whatever your reason may be, calculating the percentage of two numbers is an essential skill that can come in handy in various situations. In this article, we’ll dive into the step-by-step process of finding the percentage of two numbers, along with some real-life examples to help you understand the concept better. So, grab a pen and paper, and let’s get started!

## 1. Understanding the Purpose of Finding the Percentage of Two Numbers

**What is percentage?**

Percentage is a portion of a whole expressed as a number out of 100. It is widely used in everyday life, business, and research to express many different types of information and data. Finding the percentage of two numbers is a simple and essential mathematical tool that helps in various calculations and decision-making processes.

**Why is it important to know how to find the percentage of two numbers?**

From calculating sales tax to evaluating financial statements or analyzing scientific data, finding the percentage of two numbers is a fundamental skill. It helps to compare, interpret, and communicate information accurately and efficiently. For instance, knowing the percentage increase or decrease in a stock price over a year can help investors determine the risk and potential returns of their investments. Similarly, finding the percentage of students who passed an exam can help educators identify the strengths and weaknesses of their teaching methods and adjust their strategies accordingly.

**What are the applications of finding the percentage of two numbers?**

Finding the percentage of two numbers can be useful in many different contexts. Here are a few examples:

- Calculating discounts or markups in sales and marketing
- Measuring changes in salary, population, or production
- Evaluating the results of surveys, polls, or experiments
- Tracking progress or performance in sports, fitness, or gaming

Knowing how to find the percentage of two numbers can also help you solve more complex mathematical problems, such as calculating compound interest, determining probabilities, or modeling growth and decay.

In the next sections, we will explore step-by-step methods to find the percentage of two numbers, calculate the percentage change, apply the concept of percentage composition, and use the percentage value to discover unknown numbers.

## 2. Simple Calculation: Using Basic Formula to Find the Percentage of Two Numbers

Finding the percentage of two numbers is a common task in math. This calculation is used in real-life situations such as calculating a tip at a restaurant or determining the percentage of sales tax. Calculating percentages is easy, and you can use a simple formula to find the percentage of two numbers.

The formula to calculate the percentage of two numbers is:

**Percentage = (Part / Whole) x 100%**

Simply put, you divide the part by the whole and multiply it by 100 to get the percentage. The “part” stands for the number you want to find the percentage of, while the “whole” stands for the total amount or number.

Let’s take an example to understand this better. Suppose you are given two numbers, and you want to find out what percentage one number is of the other. If one number is 25 and the other is 100, we can find out what percentage 25 is of 100 by using the formula:

**Percentage = (25 / 100) x 100% = 25%**

So, 25 is 25% of 100. In the same way, we can find out the percentage of any two numbers using this simple formula.

Remember to use parentheses to group the divisor and then multiply the result by 100% to convert it into a percentage. It is essential to know basic formulas when finding the percentage of two numbers. In the next section, we will learn how to calculate the percentage increase or decrease using this formula.

## 3. Finding the Percent Change: How to Calculate the Percentage Increase or Decrease

Calculating percent change is an important concept to understand in mathematics. It helps us determine the difference between two values and express it as a percentage of the original value. Percent change can be both positive and negative, depending on the direction of the change. Here’s how to calculate the percentage increase or decrease:

**Identify the initial value and the final value:**Before you can calculate the percent change, you must first determine the initial value and the final value. The initial value is the starting point, while the final value is the end point.**Calculate the difference:**To find the difference between the initial and final values, subtract the initial value from the final value. If the final value is greater than the initial value, the result will be a positive number, indicating a percentage increase. If the final value is less than the initial value, the result will be a negative number, indicating a percentage decrease.**Divide the difference by the initial value:**Divide the difference by the initial value, then multiply the result by 100 to get the percentage change. If the result is a positive number, the percentage change represents an increase. If the result is a negative number, the percentage change represents a decrease.

For example, let’s say the initial value is 100 and the final value is 120. The difference between the two is 20, which represents an increase. To calculate the percentage increase, divide 20 by 100, then multiply by 100 to get 20%. Therefore, the percent change from 100 to 120 is a 20% increase.

On the other hand, if the initial value is 120 and the final value is 100, the difference is -20, which represents a decrease. To calculate the percentage decrease, divide -20 by 120, then multiply by 100 to get -16.67%. Therefore, the percent change from 120 to 100 is a 16.67% decrease.

## 4. Applying the Concept of Percentage Composition in Finding the Percentage of Two Numbers

Percentage composition is a technique for determining the relative abundance of different elements in a sample. It is often used in chemistry, but it can also be applied to other fields, including mathematics. Using the concept of percentage composition, you can find the percentage of two numbers by breaking them down into their component parts.

To use the percentage composition method, you need to divide the smaller number by the larger number and then multiply the result by 100%. This will give you the percentage that the smaller number represents of the larger number. For example, if you want to find the percentage that 8 is of 20, you would divide 8 by 20 and then multiply by 100%:

### Example:

8 ÷ 20 = 0.4

0.4 x 100% = 40%

So, 8 is 40% of 20.

Another way to use the percentage composition method is to break the larger number into smaller parts and then find the percentage that each part represents of the whole. For example, if you want to find the percentage that 12 is of 30, you could break 30 down into its component parts, 12 and 18, and then find the percentage that 12 represents of the whole:

### Example:

- Divide 12 by 30 to get 0.4
- Multiply 0.4 by 100% to get 40%

So, 12 is 40% of 30.

Using the percentage composition method can help you to easily find the percentage of two numbers, especially when dealing with complex or large numbers. It is a useful tool to have in your mathematical toolkit and can be applied in a variety of situations.

## 5. Finding Missing Values: How to Use the Percentage Value to Discover Unknown Numbers

One of the most useful applications of percentages in mathematics is finding missing values in a given set of numbers. Whether you want to find the original value after a percentage increase or decrease, or discover an unknown number using a known percentage value, percentages make it easy to calculate solutions quickly and accurately.

### Using the Percentage Formula

To find the missing value in a given set of numbers, you can use the basic percentage formula:

** (Part / Whole) x 100% = Percentage **

Suppose a product that originally costs $50 was discounted by 25%. To find the discounted price, we can use the percentage formula:

(25 / 100) x 50 = $12.5

Thus, the discounted price is $50 – $12.5 = $37.5.

### Applying the Percentage Change Formula

If you know the percentage increase or decrease of a given value, you can use the percentage change formula to find the original or new value.

** New Value = Original Value x (1 + Percentage Change/100) **

For instance, if a student’s grade increased from 70% to 80%, we can find the percentage increase and use the percentage change formula to find the original grade:

Percentage Increase = [(New Value – Original Value) / Original Value] x 100%

= [(80 – 70) / 70] x 100% = 14.29%

Original Grade = 70 / (1 + 14.29/100) = 61.54%

In conclusion, understanding how to use percentages to find missing values is a valuable skill in math. Whether you’re calculating discounts, percent changes, or using percentage composition, knowing how to use percentages accurately can save you time and effort in solving math problems.

## People Also Ask:

### 1. What is percentage?

Percentage is a way of representing values as a fraction of 100. It is used to compare quantities or express relationships between numbers.

### 2. How can I calculate percentage easily?

To calculate the percentage of two numbers, divide the smaller number by the bigger number and multiply by 100. The resulting value is the percentage of the smaller number in relation to the bigger number.

### 3. What is the percentage formula?

The percentage formula is: (part/whole) x 100. This formula can be used to find the percentage of any two numbers.

### 4. How can I find the percentage change between two numbers?

To find the percentage change between two numbers, subtract the old number from the new number. Then, divide the result by the old number and multiply by 100. The resulting value is the percentage change between the two numbers.

### 5. How do I calculate percentage increase or decrease?

To calculate percentage increase, subtract the old value from the new value and divide by the old value. Multiply the result by 100 to get the percentage increase. To calculate percentage decrease, follow the same steps but subtract the new value from the old value instead.

## Conclusion:

Finding the percentage of two numbers is a common mathematical operation used in various fields. To calculate percentage easily, you can use the formula (part/whole) x 100. To calculate percentage change and percentage increase/decrease, subtract the old value from the new value and divide by the old value. By understanding these simple formulas, you can solve various percentage-related problems efficiently.