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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The GCF is 68, the LCM is 68
The GCF and LCM of 24 and 42 are 6 and 168 respectively.
The GCF is 10. The LCM is 30.
LCM is 120, GCF is 6
Gcf= 3 lcm=78