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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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What is the GCF and LCM of 68?
The GCF is 68, the LCM is 68
What is the GCF and LCM of 24 and 42?
The GCF and LCM of 24 and 42 are 6 and 168 respectively.
What is the LCM and gcf of 4and 6?
Gcf:36 lcm:12
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The LCM is: 144The GCF is: 4
What is the GCF and the LCM of 54 and 108?
Gcf = 54 lcm = 108
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