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. More »

www.reference.com Math Fractions & Percentages

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. More »

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... More »

A calculator is always helpful when determining percentages, but you can easily compute percentages without a calculator. A pencil and paper might be helpful as you do this. More »

www.reference.com Math Fractions & Percentages

To calculate percentages, convert the percentage to a decimal and multiply it by the number in the problem. For example, to find 40 percent of 50, change it to 0.40 times 50, which gives you the result of 20. More »

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. More »

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. More »