The factors of 25 are the numbers that can divide 25 without leaving a remainder. The factors of 25 are 1, 5, and 25. When listing factors from least to greatest, you would start with 1, then move on to the next smallest factor, which is 5, and finally list 25, as it is the largest factor of 25.
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Not to overstate the obvious, but factor lists are lists of factors. Once you have found all the factors of a number, it is customary to list them from least to greatest.
-- List all factors of the first number. -- List all factors of the second number. -- If there are more than two numbers, list all factors of each one. -- Find the set of factors that are on every list. -- Find the greatest factor in the set.
The least common factor is a factor common to each of two or more numbers, and it is always 1 because 1 is the least factor of any whole number.
There cannot be a greatest common factor if there are not at least two numbers to compare. The greatest common factor is the largest factor that all the numbers have in common - the largest factor that they all share.
The factors of 64 are all 2s and the factors of 81 are all 3s. The greatest common factor is 1, since they have no factors in common. ■