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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 ??, 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 10 and 126 are 1 and 2; the greatest common factor is 2.
The common factors of 28 and 126 are 1, 2, 7, and 14; the greatest common factor is 14.
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What is the greatest common factor of 60 and 126?
The greatest common factor of 60 and 126 is 6. The common factors of 60 and 126 are 1, 2, 3, and 6. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60. The factors of 126 are 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, and 126. The common factors are 1, 2, 3, and 6. Therefore, the greatest common factor is 6. The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together. The prime factors of 60 are 2, 2, 3, and 5. The prime factors of 126 are 2, 3, 3, and 7. The prime factors in common are 2 and 3, so the greatest common factor is 2 x 3 = 6.
What is the greatest common factor of 126 and 162?
The GCF (Greatest Common Factor) of 126 and 162 is: 18
Greatest common factor of 60 126 and 216?
The Greatest Common Factor of 60, 126, 216 is 6.
What is the greatest common factor of 126 and 93 and 225?
The greatest common factor of 126, 93, and 225 is 3.
What is the greatest common factor of 105 126 and 210?
The greatest common factor of 105, 126, and 210 is 21
