There is no Greatest Common Factor (GCF) for a single number. The Greatest Common Factor is the largest factor common to two or more numbers.
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The greatest common factor of 16 and 68 is 4. Factors of 16: 1,2,4,8,16. Factors of 68: 1,2,4,17,34,68.
The greatest common factor of 4,12, and 16 is 4.The factors of 4 are 1,2, and 4.The factors of 12 are 1,2,3,4,6, and 12.The factors of 16 are 1,2,4,8, and 16The greatest common factor of 4,12, and 16 is 4.
The common factors are: 1, 2, 4 The Greatest Common Factor (GCF) is: 4
The greatest common factor of 4 and 16 is 4.The factors of 4 are: 1, 2, 4The factors of 16 are: 1, 2, 4, 8, 16The common factors are: 1, 2, 4The Greatest Common Factor (GCF) is: 4It is: 4
I know that 16 x 5 = 80, so the greatest common factor of 16 and 80 must be 16, since the greatest common factor cannot be larger than the small number. But, if you did not know this, you would need to compare their factors. The factors of 16 are 1, 2, 4, 8, and 16. The factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40, and 80. The largest of the factors they have in common is 16, so 16 is the greatest common factor. Or, you can determine the greatest common factor by their prime factors. The prime factors of 16 are 2, 2, 2, and 2. The prime factors of 80 are 2, 2, 2, 2, and 5. The prime factors they have in common are four 2s, so 2 x 2 x 2 x 2 = 16 is the greatest common factor.