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State the numbers you want to compare as a product of their prime factors. Example: 30 and 42

2 x 3 x 5 = 30

2 x 3 x 7 = 42

The GCF is the numbers they have in common, in this case 2 X 3. The GCF is 6.

The LCM is all the numbers, getting rid of duplicates, in this case 2 x 3 x 5 x 7. The LCM is 210. If one of the numbers you want to compare is prime, the GCF is usually one and the LCM is usually the two numbers multiplied together.

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Q: How do you calculate the LCM and GCF?
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