1, 3, and 9 are the greatest ones. They're also the smallest ones.
The absolute biggest of the greatest is 9 .
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Factors of 1: 1
Factors of 9: 1, 3, 9
Factors of 27: 1, 3, 9, 27
GCF (1, 9, 27) = 1
The factors of 27 are:1, 3, 9, 27The factors of 63 are:1, 3, 7, 9, 21, 63The Greatest Common Factor:GCF = 9
Since 9 is a factor of 27, all of its factors are common.
Short answer: There are none. There is neither a greatest common factor nor common factors of a single number, such as 27, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor. Examples: The common factors of 27 and 29 are only 1; the greatest common factor is 1. The common factors of 27 and 33 are 1 and 3; the greatest common factor is 3. The common factors of 27 and 45 are 1, 3, and 9; the greatest common factor is 9. The common factors of 27 and 81 are 1, 3, 9, and 27; the greatest common factor is 27.
The factors of 45 are: 1, 3, 5, 9, 15, 45The factors of 81 are: 1, 3, 9, 27, 81The common factors are: 1, 3, 9The Greatest Common Factor (GCF) is: 9
The factors of 15 are: 1, 3, 5, 15.The factors of 27 are: 1, 3, 9, 27.The common factors are: 1, 3.The Greatest Common Factor (GCF) is: 3