How to Solve a Factorial

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Solving a factorial always requires you to keep a few very important things in mind. Solve a factorial with help from a longtime mathematics educator in this free video clip.

Part of the Video Series: Principles of Math
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Video Transcript

Hi, I'm Jimmy Chang and we're here to talk about how to solve a factorial. Now, in order to solve a factorial, it's important that you understand the definition of factorial and then we'll go from there. So, the whole idea here is the notation for in factorial is basically going to be, you're going to take the number that's given to you, multiply by the number that's one less than that and multiply by the number that's two less than the original, all the way down to three times two times one. So, a quick illustration on this is if you have six factorial, the, the idea here is you're starting off with the number that's given, so it'll be six times the number that's one below it, five, times the number that's two below which is four and then down three, two and one. And to find out what that is, just go ahead and multiply them all and you'll go from there. Some calculators have a factorial button, so it could make the calculations easier. Now, if you have ten factorial, same kind of idea; you're starting off with ten and then multiply by the number that's low, one lower than that, multiply by the number that's below that and then all the way down to three, two and one. And then to find what the factorial is, just multiply the string of numbers and you'll be good to go. As you may have picked up by now, the higher the factorial, the larger the number itself. So, if you understood how the pattern and definition works, you should be all set. So, I'm Jimmy Chang and that's how to calculate factorials.


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