28 = 2 x 2 x 7 42 = 2 x 3 x 7 GCF = 2 x 7 = 14
3 and 42 6 and 21
7
If the GCF of two numbers p and q is 7, then the GCF of p2 and q2 is 14.
You need at least two numbers to find a GCF.
7
7
We know the gcf x LCM= AB where A and B are the two numbers. So the product of the two number we seek is 196 7 and 28 have a product of 196 and the gcf of 7 and 28 is 7. The LCM of 28 and 7 is 28. So the two numbers are 7 and 28. ( I started out by dividing 196 by 7 to get the 28)
The first two are prime so their hcf, and that of all three numbers, is 1.
HCF is the highest common factor of two or more numbers. HCF of 56 and 49 is 7.
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 GCF is 7.