Find GCF of two numbers

Teaching Transcript

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Let's find the greatest common factor of 12 and 18

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First we find the prime factors of both. 12 has prime factors of 2, 3, and 2. 18 has prime factors of 3, 3, and 2

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Now we can identify the full list of shared factors. In this case, that's 3 and 2

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The greatest common factor is these factors multiplied together. So the greatest common factor of 12 and 18 is 6

This math skill teaches how to find the greatest common factor (GCF) of two numbers by identifying and multiplying their shared prime factors.

Find greatest common factor of two numbers

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Teaching Transcript

🎙️

Let's find the greatest common factor of 12 and 18

🎙️

First we find the prime factors of both. 12 has prime factors of 2, 3, and 2. 18 has prime factors of 3, 3, and 2

🎙️

Now we can identify the full list of shared factors. In this case, that's 3 and 2

🎙️

The greatest common factor is these factors multiplied together. So the greatest common factor of 12 and 18 is 6