Prime factorization.
A number is an exact multiple of each of a group of numbers. For example, 15 and 30 are common multiple of 3 and 5.
You can't find the greatest common multiple in any amount of numbers, the number would be infinite.
That's the least common multiple, or LCM.
It is called the "least common multiple".
The Least Common Multiple (or Lowest Common Multiple) of a group of numbers, called the LCM, is the smallest number that's a multiple of all the numbers. For instance, the LCM of 16 and 20 is 80; 80 is the smallest number that's both a multiple of 16 and a multiple of 20.
Prime factorization.
A multiple is a number that the original number divides evenly into.Ex. 120 is a multiple of 60.A common multiple is a number that a pair/group of numbers both divide evenly into.Ex. 12 is a common multiple of 2, 3, 4, and 6.
One way to find a common multiple of any group of numbers is to multiply them all (to find the product). So one common multiple of 42 and 60 is 42x60=2520 This will not however, always give the LOWEST common multiple, which in this case is 420.
The lowest common FACTOR of any set of numbers is 1. Perhaps you meant the Lowest Common MULTIPLE, which for 6, 10, 15 is 30. Or you meant the HIGHEST Common Factor, which for 6, 10, 15 is 1.
Asking a multiple choice question without providing the choices doesn't really seem fair.
-- The least common factor of any group of whole numbers is ' 1 '.-- The greatest common factor of 10 and 35 is 5 .-- The least common multiple LCM(10, 35) = 70
You need at least two numbers to find an LCM. If that group is more than one number, put spaces between them.