You can multiply the number 18 by different numbers that are relatively prime, for example by different prime numbers.
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18 and 9 * * * * * Not so. LCM(9, 18) = 18, not 54. The correct answer is 18, 27.
A set of numbers can only have one GCF. 6, 12 and 18 have a GCF of 6. 16, 32 and 48 have a GCF of 16. 25, 50 and 75 have a GCF of 25. The GCF of 6, 16 and 25 is 1.
The numbers are 18 and 20.
The GCF of the given numbers is 18
31 and 18