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.
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1 is the factor that is common to all numbers.
Write out the factors of all the numbers. The GCF is the highest number that appears on all the lists. In this case, the GCF is 1.
You list all the factors of each number, then compare the lists to find numbers thatare on both lists, then finally pick the highest of those.Factors of 21: 1, 3, 7, and 21.Factors of 630:1, 2, 3, 5, 6, 7, 9, 10, 15, 18, 21, 30, 35, 42, 63, 70, 90, 105, 126, 210, 315, and 630.Numbers on both lists (common factors): 1, 3, 7, and 21.Highest common factor: 21
The Greatest Common Factor (GCF) is the largest factor common to two or more numbers. For example, 17 is the GCF of 34, 51, and 102 because it is the largest number that is a factor common to all three numbers.The GCF, or Greatest Common Factor, is the largest positive integer that can be evenly divided into all the numbers of a given set.
2 is a common factor of 4 and 8 3 is a common factor of 6 and 9