# How to Cross-Simplify

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Cross-simplifying is something that you do when working with fractions. Cross-simplify with help from an expert in computers, with two degrees in both Computer Science and Applied Mathematics from the New Jersey Institute of Technology, in this free video clip.

Part of the Video Series: Math Skills
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## Video Transcript

Hi, my name's Steffan. Today, I'm gonna be speaking on how to cross simplify. Let's say we have the product of two fractions. We have 10 over 12 and we're multiplying this times 9 over 15. Now, another way to look at this or write this, there's equivalent to five times two over 12, times nine over five times three. So, we see that we have a five on the numerator, and a five on the denominator here. So we can actually cross these out, we're simplifying, and we're just crossing these out, because five divided by five is equivalent to one. So now we're left with two over 12, times nine over three. And you notice that this can also be written as two over four time three, times three times three over three. And we see that this three cancels with this three here, and we're cross simplifying, simplifying across. And we're left with two over four times three over three, and of course, this cancels and you're left with one-half. And that's how you cross simplify.

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