LCM and GCF – And Something Really Cool

In a previous post, we learned that you don’t have to use a LCM (least common multiple) to find a common denominator to add fractions. In another post, we learned that you can use primes instead of the GCF (greatest common factor) to reduce fractions.

And now I’m going to demonstrate that finding the LCM and GCF of two numbers is still pretty cool.

Apologies for the glare on the video. I tried a different method and clearly it is inferior to the other method.

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