To find the GCF and the LCM you have to first at least try to use prime factorization. So use factor trees. Or for the LCM find th least common multiples of the number.
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The product of the original numbers is equal to the product of the GCF and LCM. Divide the product of the LCM and GCF by the one number. The answer will be the other.
You can find the GCF and/or the LCM of a set of numbers by comparing the prime factorizations of the individual members of the set.
The GCF is: 16The LCM is: 640The LCM is: 640
The GCF is 5. The LCM is 575.
GCF=1. LCM=120