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.
Continue ReadingTo calculate the addition or subtraction of percentages, it is first necessary to understand the relationship between a percentage and its decimal representation.
To Add a Percentage to a Given Number
Multiply the base number by 1 plus the percentage as a decimal. For example, to add 25 percent to the number 4: 4 x (1 + 0.25) = 4 x 1.25 = 5.
To Add Two Percentages Together
Convert the percentages to fractions with a common denominator and perform the simple addition operation. Then the answer may be converted back to a percentage. For example, to add 20 percent to 30 percent: 20 / 100 + 30 / 100 = 50 / 100 or 50 percent.
Learn more about Fractions & PercentagesOne method to manually convert a fraction to a decimal is to multiply the denominator, the bottom number, by a number that will make the denominator a factor of 10. Then multiply the numerator, the top number, by the same number used on the denominator. Rewrite the fraction as a decimal using place values.
Full Answer >To convert a percentage to a ratio, write out the percentage number as a fraction, reduce the fraction to its simplest form and convert the new fraction to a ratio by replacing the slash mark with a colon. Converting a percentage to a ratio takes only a few minutes and requires paper and a pencil.
Full Answer >To find the percentage of a number, multiply the number by the percentage fraction. A percentage is a proportion between two quantities expressed in hundredths.
Full Answer >The percentage of a number is found by multiplying the percent value by the base to get the percent amount, according to the Monterey Institute of Technology and Education. The base is the whole number and the percentage is some portion of it.
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