This math skill teaches how to find the greatest common factor (GCF) of two numbers by identifying their shared prime factors and multiplying them together to find the GCF.
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Find greatest common factor from factored numbers
Test your understanding of find GCF from factored numbers by practicing it! Work through the below exercises to use it in practice.
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Let's find the greatest common factor of 8 and 12. We already have their prime factors here
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Find the set of shared factors. That's just 2 and 2
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The greatest common factor is the multiplication of these shared factors. 2 times 2 is 4, so 4 is the greatest common factor of 8 and 12