If you use methods based on prime factors, it is the same whether you have 2, 3, or more numbers: find all the factors that occur in any of your numbers.
If you use a method based on Euclid's Algorithm (that is, lcm(a, b) = a x b / gcf(a, b), where you find the gcf with Euclid's Algorithm), then you can find the lcm for two numbers at a time. For example, to get the lcm of four numbers, find the lcm of the first two, then the lcm of the result and the third number, than the lcm of the result and the fourth number.
If the GCF of a given pair of numbers is 1, the LCM will be equal to their product. If the GCF is greater than 1, the LCM will be less than their product. Or, stated another way, if the two numbers have no common prime factors, their LCM will be their product.
None. The LCM of two (or more) numbers is at least as large as the numbers. This means that the LCM must be larger than the smallest of the set of numbers and so the LCM cannot go into it.
need more than one number an LCM..
The LCM of two numbers will never be less than the GCF.
By finding out whether they have any factors in common. If the only factor they have in common is 1, the LCM will be their product. If they have more factors in common, their LCM will be less than their product.
LCM is the multiple of the highest power of prime factors of two or more numbers. Since prime numbers have no other factors than themselves, the LCM of two or more prime numbers is their product. As an example, the LCM of 3, 5, and 53 is 3 x 5 x 53 = 795.
The LCM will never be less than the GCF of a set of numbers.
At least 2 numbers or more are needed for numbers to have a LCM
Two or more numbers are needed to find their LCM
If their GCF is 1, their LCM is their product. If their GCF is greater than 1, their LCM is less than their product.
The LCM of a set of numbers can never be smaller than the largest number in the set.
Two or more numbers are needed to find their LCM