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www.reference.com/article/figuring-percentages-7690e1f73c3b828a

Figuring percentages is determining how many of something is per 100. For example, 50 percent is the same as 50 per 100.

Two-fifths is equivalent to 40 percent. Dividing the numerator, 2, by the denominator, 5, yields a decimal value of 0.40. Decimal values can be converted to percentages by multiplying by 100, which means that 0.40 is equal to 40 percent.

www.reference.com/article/percentages-calculated-c4cf4def163fed0d

Percentages are calculated by finding what portion a fractional amount takes up out of 100. By comparing a fractional amount to x/100, a percentage can be found.

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www.reference.com/article/formula-percentages-6a18d4919bc47cb3

The formula for finding percentages is to divide part of the whole quantity by the whole quantity and then multiply by 100 percent. A percentage change can be found by simply dividing the old quantity into the difference between the old quantity and the new quantity. Th...

www.reference.com/article/way-figure-percentage-7528caff4644e672

The easiest way to calculate percentage is to divide the whole into the part and multiply the answer by 100. If a student gets 20 out of 25 questions correct, his percent correct is calculated by dividing 20 by 25 for a total of 0.8 and multiplying by 100.

www.reference.com/article/invented-percentages-657eca4cb7048e89

No one person invented percentages. The concept developed throughout history. In Ancient Rome mathematical computation were expressed in fractions of 100. This concept later evolved into percentages.

www.reference.com/article/good-percentage-calculators-63f03f12b80baaab

Jari Jokinen's and the Math Easy Solutions percentage calculators both allow a user to find percentages by entering values into common percentage verbiage used in word problems. The Math Is Fun percentage calculator allows someone to compare two numbers percentage-wise.