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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

**Let’s review the concept of fractions.**A fraction is a comparison between two quantities, usually between a part of something and the whole thing. People often take the example of cutting a cake into eight equal parts. The quantity above the fraction, also known as

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.

**Notice the special relationship of percentages.**Percent is a special form of fraction, where

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%.**

**Use a calculator to convert fractions to decimals or percentages.**If you have a fraction, you can easily convert it to a decimal using a calculator. If the fraction is difficult to divide,

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.)

**Convert decimals to percentages by shifting the decimal point.**If you have decimals available, converting to percentages is easy. Since the decimal number system is based on base 10, you can simply convert decimals to percentages

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%.

**Remember how to convert basic fractions.**Memorizing the percentages of basic fractions will be very helpful to you because the denominator of the percentages is always 100, so certain values are constant.

^{[4] X Research Sources}

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

**Add percentages directly.**You can add percentages without any further calculations because percentages are fractions with a common denominator of 100. Conversely, when adding fractions together, you have to do the extra step of finding the denominator. common numbers and convert the fractions to the form with the same denominator. However, with percentages, you don’t need to do anything more.

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.

**Subtracting the percentage is similar.**As above, percentages are fractions with a denominator of 100, so you don’t need to do any extra calculations when subtracting percentage numbers. If you subtract a percentage from the original number, you need to treat the original number as 100 (because the original number is 100%).

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%** .

**Multiply and divide using decimal conversion.**If you have trouble calculating

**25% x 30**, please

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

**Do multiplication to find the percentage “of” a number.**A common calculation involving percentages is to find the percentage “of” another number. For example, you go to a restaurant and want to tip 15% of the bill value. When calculating percentages,

So 15% “of” 100 means 15% x 100. ^{[6] X Research Source}

**Convert percentages to decimals and do multiplication.**To calculate a percentage of an integer, you must first convert the percentage to a decimal as described above. Then just do the multiplication.

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.

**Write the result without the percent sign.**When you find the percentage of an integer,

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

**Find the % key on your computer.**Most simple pocket calculators have a % key. More sophisticated graphing calculators may not have these keys because the inventors say you don’t need them. More basic calculators often have a % key.

**Practice using the % key to convert decimals.**The simplest way to use the % key is

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.

**Use the % key to calculate.**The % key on the calculator will make some calculations simple. Let’s say you want to tip 15% of an invoice amounting to $75.32. If you have a computer, just press the 15% x 75.32 keys. The result will be 11,298, which equates to a tip of about $11.3.

- 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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