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Percent means out of a whole, and is found by getting out of 100. For example, 20% of 100 is 20, and 20% of 10 is 2. However, if you were to find a percentage like 15% of 80, or 5% of 25, then you would need to know the fractions or decimals that percentages represent. 10% is 1/10 or 0.1, and you divide the whole number by 10 to get the answer. 50% is 1/2 or 0.5, and you would find it by halving the whole number. In addition, a shot way of finding things like 25% (1/4) or 5% is to halve a percentage that you can easily deal with, such as 50%, which you would halve to get 25%, and 10% which you would halve to get 5%. You can also add together easily found percentages, as well as take away.
To easily find this, find a scientific calculator and divide the whole with the fraction that the percentage equals to (press the button with the little square above and below a line and type in the fraction),or get a normal calculator and divide the whole by the decimal.
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