How to Solve Percentages of Numbers


Hi, my name is Marija, and today, I'm gonna show you how to solve percentages of numbers. If you are asked to solve 30 percent of 15, the word "of" in math, usually indicates to multiply. So, we're gonna have to multiply 15 by 30 percent. But, we can't multiply a percent. We have to change it into a decimal, first. So, the way to change a percent into a decimal is to take the number 30, and take it's decimal, and move it two spaces to the left, so now we have point 30. So, we're doing 15 multiplied by point 30, and when we do that, we get three times five is 15, and three times one plus four, plus, three times one plus one is four, and then we move our decimal space back two spaces and we get four point five. So, 30 percent of 15 is equal to four point five. So, again, you're just gonna multiply the number by the percent, once you've convert it into a decimal, and then you'll have the percentage of the number.

Marija Kero graduated from the Pforzheimer Honors College at Pace University with a Bachelor's Degree in Mathematics and Adolescent Education.