All nonzero numbers have factors. Some numbers have some of the same factors as other numbers. These are called common factors. Some factors are positive numbers. Common factors which are positive numbers would be called positive common factors.
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5 is a positive common factor of 15 and 10
The lowest common factor of any set of positive integers is 1.
The greatest common factor, or GCF, is the largest positive integer that will divide evenly with no remainder into all the members of a given set of numbers. The least common multiple, or LCM, is the smallest positive integer that all the members of a given set of numbers will divide into evenly with no remainder. Factors go into numbers, numbers go into multiples.
All numbers have factors. The factors that are positive numbers are known as positive factors.
It is not possible to give a sensible answer to this question. A common factor refers to a factor that is COMMON to two or more numbers. You have only one number in the question!