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Short answer: There are none.
There is neither a greatest common factor nor common factors of a single number, such as 54, 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 4 and 54 are 1 and 2; the greatest common factors is 2.
The common factors of 18 and 54 are 1, 2, 3, 6, 9, and 18; the greatest common factor is 18.
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What are the common factors of 32 and 54?
The common factors of 32 and 54 are: 1 and 2
What are the common factors of 54 and 63?
The common factors of 54 and 63 are: 1, 3, and 9
What are common factors of 54 18?
Since 18 is a factor of 54, all of its factors are common.
What are the common factors of 126 and 54?
The common factors of 126 and 54 are: 1, 2, 3, 6, 9, and 18
What are the common factors of 42 and 54?
The common factors of 42 and 54 are: 1, 2, 3, and 61, 2, 3 and 6.
