The term "percentage" was adapted from the Latin word "per centum", which means "by the hundred". Percentages are fractions with as the denominator. In other words, it is the relation between part and whole where the value of whole is always taken as Percentage is a fraction or a ratio in which the value of whole is always Percentage is defined as a given part or amount in every hundred. Calculating percentage means to find the share of a whole, in terms of There are two ways to find a percentage:.
It should be noted that the second method for calculating percentage is not used in situations where the denominator is not a factor of For such cases we use the unitary method. Percent is another name for indicating hundredths. When we have two or more values that add up to , then the percentage of those individual values to the total value is that number itself. For example, Sally bought tiles of three different colors for her house.
The details of the purchase are given in the following table. Since the total number of items adds up to , the percentages can be easily calculated. What if the total number of items do not add up to ? In such cases, we convert the fractions to equivalent fractions with the denominator as For example, Emma has a bracelet which is made up of 20 beads of two different colours, red and blue.
Observe the following table which shows the percentage of red and blue beads out of the 20 beads. Emma's sisters, Nora and Jenny, calculated the percentages as well, but in different ways.
Nora used the unitary method. Using the unitary method for calculating percentage, we say that out of 20 beads, the number of red beads are 8. The percentage formula is used to find the share of a whole in terms of Using this formula, you can represent a number as a fraction of If you observe carefully, all the three ways to get percentage shown above can be easily calculated by using the formula given below:.
Percentage difference is the change in the value of a quantity over a period of time in terms of percentage. Sometimes we need to know the increase or decrease in some quantity as percentages, which is also referred to as Percentage Change. For example, an increase in population, a decrease in poverty, and so on. We have the formula to show the change in quantity as a percentage. You can solve a percentage change by dividing the whole value by the original value and then multiplying it by The formula for solving a percentage change is the following:.
You would then divide this by the old price: 25 divide by equals 0. You will then multiply this number by 0. You will then divide this number by the old price: 25 divided by equals 0. You would then multiply this by 0. You can use percentages to compare two different items that are related to each other. For example, you may want to determine how much a product cost last year versus how much a similar product costs this year.
This calculation would give you the percent difference between the two product prices. In this formula, V1 is equal to the cost of one product, and V2 is equal to the cost of the other product.
You will then divide 5 by You will then multiply 0. Find jobs. Company reviews. Find salaries. Upload your resume. Sign in. Career Development. What is percentage?
How to calculate percentage. Determine the whole or total amount of what you want to find a percentage for. Divide the number that you wish to determine the percentage for. Multiply the value from step two by Once you understand these simple methods, these questions become easy to solve. For example, if you know that 30 percent of the students in a school are boys, that means that there are 30 boys per one hundred students. Another way to say this is that 30 out of students are boys.
To figure out the decimal form of a percent, simply move the decimal two places to the left. For example, the decimal form of 10 percent is 0. Then, to calculate what 10 percent of is, say, students, simply multiply the number of students by 0.
If you can commit the percentage list below to memory, you will be able to calculate a wide variety of percentages without a calculator. To calculate 50 percent of a number, simply divide it by 2. For example, 50 percent of 26 is 26 divided by 2, or To calculate 25 percent of a number, simply divide it by 4. For example, 25 percent of 12 is 12 divided by 4, or 3.
To calculate 10 percent of a number, simply divide it by 10 or move the decimal point one place to the left. For example, 10 percent of is divided by 10, or To calculate 5 percent of a number, simply divide 10 percent of the number by 2. For example, 5 percent of is 23 divided by 2, or So how much is 15 percent of ?
You can use the four key percentages you memorized to figure this out.
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