LH6
Least Common Factors
A test question may give you a few numbers and ask what is their "least common factor". "Least common multiple" is the same thing.
The simplest way to find the least common factor of two numbers is to take the smaller of the two numbers and multiply it by two, then by three, and so forth. Then do the same thing for the larger of the two numbers, looking for the lowest number which is on both lists.
For example, if a question asks the least common factor of 6 and 15, you would start by listing 6, 12, 18, 24, 30, 36, etc. Then you would take the second number and list 15, 30, 45, etc. The lowest number on both lists would be 30, which is the answer.
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