5
There is neither a greatest common factor nor common factors of a single number, such as 320, 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. The factors of 320 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, and 320. Examples: The common factors of 60 and 320 are 1, 2, 4, 5, 10, and 20; the greatest common factor is 20. The common factors of 72 and 320 are 1, 2, 4, and 8; the greatest common factor is 8.
When two or more numbers each have one or more of the same factors, these factors are called common factors. A single number does not have common factors.
The greatest common factor (GCF) is 64.
The GCF of 280 and 320 is 40
The GCF of 320 and 840 is 40.
20
Since 20 is a factor of 320, it is automatically the GCF.
Since 40 is a factor of 320, it is automatically the GCF.
The GCF is 10.
The GCF is 16.
The GCF is 5.
The GCF is 320.