Multiply Fractions w/ Cross Cancellation (Cancelling Terms) - [7-2-11]

More Lessons: www.MathAndScience.com
Twitter: / jasongibsonmath
In this lesson, you will learn how to multiply fractions. We will emphasize the process of cross cancellation before doing the multiplication, which means that we will pre simplify the fractions before doing the multiplying. In this way, the answer is fully simplified and we don't have to work with very large numbers after doing the multiplication. It is also important to know how to multiply in this way for algebra in the coming lessons.

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Geezus, that example is 100% perfect for explaining this. So many others make this way more complex than what you're describing lol!

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[@MathAndScience]

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Very good explanation

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[@solak6649]

But why not divided by 2. Or ar you finding trying to come up with the already existed answer

[@Compuscience-Python-Prog-Exps]

I was taught to think about the Magic '1', that you always have to imagine dropping either at the bottom: Denominator or the top number, if the fractions are flipped upside down. However, you showed me how to CANCEL OUT numbers that go evenly into the crossed numbers either to the left or right. Does this work with the other side, if you cancel as long as the smaller number fits evenly into the bigger number. Then again, I'm still watching this video, but I"m catching on. WOW!

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[@romanemul1]

5:36 What was that ?

[@patpalmer1337]

Having trouble understanding the why of multiplying makes it smaller...

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[@LemonPuf]

So when you multiply a fraction it’s really taking away

[@MathAndScience]

Yes! And if the fraction you multiply is greater that 1 whole such as 5/4, then you are multiplying by something larger than one, and so the result is that the answer that you get will be larger than the original fraction.

[@LemonPuf]

@@MathAndScience Thank you - so under 1 whole is a minus and greater than 1 whole is a plus with these fractions?

[@LemonPuf]

@@MathAndScience eg 4/5 x 5/4 =1

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