If you mean 12, 16 and 28 then the HCF is 4
The GCF is 1.
That would be 4, and 2; greatest common factor is 2.
It is not possible to give a sensible answer to this question. The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
The highest common factor (HCF) of 18 and 32 is 2. To determine this, we can list the factors of each number: the factors of 18 are 1, 2, 3, 6, 9, and 18, while the factors of 32 are 1, 2, 4, 8, 16, and 32. The largest factor that appears in both lists is 2.