By knowing that 50 percent 12 25 percent 14 75 percent 34 and 33 percent equals approximately 13 it is possible to figure many percentages easily. An important thing to remember is to cross-multiply after you have identified the different parts of the formula. The basic concepts and ideas of this lesson are also explained in this video.
Cross-multiply means to multiply the numerator of one fraction by the denominator of the other fraction.
Being able to calculate percentages isnt just necessary for schoolkids to pass their next math test on the topic. Thus 50 percent of 12 equals 6 because 12 of 12 is 6 and 25 percent of 12 is 3 because 14 of 12 is 3. 31 x 6 186. How To Calculate Percent Determine the total or whole amount.