Greatest common factor of 255 and 256?

Answer 1

Basically factorise 255 and 256 separately.

i.e. what prime numbers multiply together to give you 255 first

5 divides in (which is prime) to give you 51

then 51/3 =17

i.e. 5,3,17 = factors of 255

and 2,2,2,2,2,2,2,2 are factors of 256.

The answer is 1 because you cant multiply 5,3 and 17 to give you an even number which is all you can get by multiply 2,2,2 etc.

Thus ANSWER Is 1