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!
hcf(18, 30) = 6.
HCF = 3... LCM = 18 !
The GCF is 18.
The GCF is 3.
The GCF is 18.
The HCF of the numbers 18 and 40 is 2.
The GCF is 9.
6 is the HCF of 18 & 48
The GCF is 6.
The HCF is 18
The hcf is 12
The GCF is 18.