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www.reference.com/article/percentage-americans-black-2500e79649984daa

As of 2013, an estimated 13.2 percent of the population in the United States is African-American. This percentage reflects those who identified themselves as a single race and does not include those who identify as having two or more races, which may include some African-Americans.

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/percentage-777017fb26e10fa

Percent simply means "out of 100." Instead of saying it "he made 54 out of 100 shots," it is easier to say "he shot 54 percent from the field." The percentage of any number may be calculated by following just a few simple steps.

To add a percentage to a given number involves multiplying the base number by a decimal that represents the percentage fraction. Adding two percentages together involves the opposite, or converting the percentages to fractions.

www.reference.com/article/percentages-6524f5e20ccdf5aa

A percentage can be solved by multiplying a given quantity by a percent. It should be noted, however, that the percent should first be divided by the numeral 100 before doing the multiplication.

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.

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/way-figure-out-percentage-27f2c4991ace61f0

To figure out a percentage, a person simply divides the two numbers in question then multiplies the answer by 100. In most cases, a small number is divided by a large number. Depending on the circumstance, however, the process may be reversed.

www.reference.com/world-view/percentage-nfl-players-black-929c15ca3ccc5194

The average number of black players in the National Football League is approximately 70 percent. There are representations of almost every race in the NFL, but African-American's make up the largest percentage.

www.reference.com/world-view/average-percentages-aee82e7fa642b2ef

To average percentages, one should add up all the numbers involved, then divide the total sum by the amount of numbers added. It is best to convert the percentages to decimals first.