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How Do You Find 20 Percent of a Number OR

## How Do You Find 20 Percent of a Number

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Percentages are just one way of expressing numbers that are part of a whole. These numbers can also be written as fractions or decimals. 50% can also be written as a fraction, $$\frac{1}{2}$$, or a decimal, 0.5. They are all exactly the same amount. (Source: www.bbc.co.uk)

### Number

Remember that in decimal multiplication, you multiply as if there were no decimal points, and the answer will have as many “decimal digits” to the right of the decimal point as the total number of decimal digits of all of the factors. So when you multiply 0.7 × 80, think of multiplying 7 × 80 = 560. Since 0.7 has one decimal digit, and 80 has none, the answer has one decimal digit: 56.0 Thus, 0.7 × 80 = 56.

Once you've reduced the fraction to its smallest, divide the number for which you are finding the percent by the denominator of the fraction. In the example, you would divide the $45 regular price by five, which equals nine. Then multiply nine by the numerator of the fraction (one), which equals nine. Thus, the item is$9 off and will cost $36. If the item were 40 percent off, the fraction would be 40/100, reduced to 2/5. You would then divide the price,$45, by the denominator, which is five, to equal nine. You would then multiply nine by two and get 18, which means the item is \$18 off. (Source: pocketsense.com)

### Example

The percentage increase calculator above computes an increase or decrease of a specific percentage of the input number. It basically involves converting a percent into its decimal equivalent, and either subtracting (decrease) or adding (increase) the decimal equivalent from and to 1, respectively. Multiplying the original number by this value will result in either an increase or decrease of the number by the given percent. Refer to the example below for clarification.

Other than being helpful with learning percentages and fractions, this tool is useful in many different situations. You can find percentages in almost every aspect of your life! Anyone who has ever been to the shopping mall has surely seen dozens of signs with a large percentage symbol saying "discount!". And this is only one of many other examples of percentages. They frequently appear, e.g., in finance where we used them to find an amount of income tax or sales tax, or in health to express what is your body fat. Keep reading if you would like to see how to find a percentage of something, what the percentage formula is, and the applications of percentages in other areas of life, like statistics or physics. (Source: www.omnicalculator.com)

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