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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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Continue Learning about Math & Arithmetic
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 GCF and LCM of 10 and 30?
The GCF is 10. The LCM is 30.
What is the GCF and the LCM of 24 and 30?
LCM is 120, GCF is 6
What is the GCF and LCM of 6 and 45?
Gcf= 3 lcm=78
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