a and b have no common prime factors. Their LCM is their product.
The LCM of 60 and 18 is 180
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.
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If the prime factorizations have no factors in common, the LCM is the product of them.
If the first step is writing down the numbers, the second step is finding their prime factorizations.
1, 111, 19The GCF is 1.
The LCM is 56 which is 28 x2.If we write the prime factorizations of the two numbers we have:28=22 x78=23Now to find the LCM we multiply 23 x71 =56.56.
Both start with finding the prime factorizations of the given numbers. The difference is which of those factors you select.
Prime factors are part of prime factorizations. Prime factorizations help in finding the GCF and LCM of integers. Finding the GCF helps in reducing fractions. Finding the LCM helps in adding and subtracting unlike fractions. Carpenters do this. Chefs do this. It's entirely possible you will have no need of this, but it's better to know something and not need to use it then not know something you need to use. If you have children of your own, you can help them with their math homework.
5 x 7 = 35 2 x 5 x 5 = 50 2 x 5 x 5 x 7 = 350, the LCM
If none of the prime factors are in common, the LCM will be the product of the two.