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Percent is a special way of representing a portion of something, expressed as a fraction with a denominator of 100. So 100% means 1 (whatever the unit of measure is), 50% means half. Performing multiplication and other calculations as percentages on a pocket calculator will be very easy if you learn to write numbers as percentages. Some calculators even have a % key to make calculations simpler.
Steps
Convert fractions and decimals to percentages
The number below, also known as
– in this case 8 [1] X Research Source
- For example, the fraction 1/8 represents a portion of a pie that is cut into eight parts.
- The fraction 7/8 represents 7 portions of the pie, almost the entire pie.
In fact, people don’t cut the cake for calculation, so the concept of percentage is more commonly used because it is the standard.
Find a half
For fractions, the “half” of something will depend on the number of parts.
If your “pie” is cut into 8 pieces, then half will be 4. If your “pie” is cut into 22 pieces, half will be 11. The result is always variable. But with percent, half never changes, always 50%.
The calculator will give the decimal value of the fraction. [2] X Research Source
Examples of using a calculator
Let’s say you have the fraction 1/2. Please operate on the calculator 1 ÷ 2, the calculator will give the result 0.5.
Convert the fraction 1/4 to a decimal by pressing 1 ÷ 4. The result will be 0.25.
For a more complicated example, you can convert 274/312 to a decimal by clicking on the calculator 274 ÷ 312. The result would be 0.878. (There are more digits after the comma, but for this example, we only take up to 3 digits.)
If the decimal has only one digit you can add a zero to the right, for example turning 0.5 into 0.50 or even 0.500. The values of these numbers are the same. [3] X Research Sources
Decimal conversion examples
Let’s take the example above, change 1/2 to 0.5. To convert this decimal to a percentage, shift the comma two digits to the right. First rewrite 0.5 to 0.50. When you translate a two-digit comma, you convert 0.50 to 50%.
For example, the fraction 1/4, which is equivalent to the decimal number 0.25, when shifting the comma will be 25%.
Convert basic fractions to remember
3/4 = 75%
1/2 = 50%
1/3 = 33 1/3%
1/4 = 25%
1/5 = 20%
1/8 = 12.5% (this conversion is often used in the banking sector)
Basic calculation with percent
Example of adding percentages
If there are six people who each account for a share of the payroll, you can calculate their total salary share by adding up each person’s share of the paycheck. If each person’s salary is 10%, 5%, 8%, 22%, 10% and 8%, you just need to do the addition 10+5+8+22+10+8 = 63 . So six people account for 63% of the company’s total salary.
When adding, do not pay attention to the percentage sign, just add the numbers and put that sign after the result.
Example subtracting percentages
Let’s say you want to calculate a percentage of income. 100% is the total income from a certain project, you want to subtract, for example, 10% of expenses, 12% of salary, and 25% of taxes. How much will the rest be? You just need to get the calculator to do the subtraction 100-10-12-25. The result is 53% .
The problem will be 0.25 x 30 and the result is 7.5. Similarly, if it’s hard for you to do 200 ÷ 10% division, rewrite it as 200 ÷ 0.10 and work it out on the calculator. Calculation result is 2000. [5] X Research Source
- You may be surprised by the final calculation if you think you’ll end up with a smaller number than the original. However, you need to understand that dividing by a number less than 1 is multiplying by the reciprocal of that number. For example,
dividing by 1/10 is the same as multiplying by 10.
Divide by 1/2 is similar to multiply by 2.
Calculate percentage of integer
So 15% “of” 100 means 15% x 100. [6] X Research Source
Example find percentage of integer
To calculate 15% of 100, convert 15% to 0.15. Then do the multiplication 0.15 x 100, the result is 15.
At the beginning of the calculation you can still keep the percent sign, but when you convert the percentage to a decimal to do the multiplication, the result will no longer have the percent sign.
- In the example that calculates 15% of 100, the result is the integer 15.
Use the % key on the calculator
Enter the number and press the % key, the calculator will output the corresponding decimal number.
Example using % key
To represent the number 4% on a calculator, simply press the 4 key and the % key. The calculator will convert the number 4 to the corresponding decimal number 0.04.
To convert the number 82.5% to decimal, just press the keys 8, 2, , , 5, %. The calculator will give a result of 0.825.
- Whenever you use a calculator to calculate a percentage, be sure to press the Clear (C) or All Clear (AC) key before you begin.
- When entering a number to calculate, you will see that as soon as you press the % key, the number 15 will change to 0.15. The next calculation will be 0.15 x 75.32.
Things you need
- Calculator
- Pencil
- Paper
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This post has been viewed 40,608 times.
Percent is a special way of representing a portion of something, expressed as a fraction with a denominator of 100. So 100% means 1 (whatever the unit of measure is), 50% means half. Performing multiplication and other calculations as percentages on a pocket calculator will be very easy if you learn to write numbers as percentages. Some calculators even have a % key to make calculations simpler.
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