First, Split the number 256 into two factors and then look for prime and nonprime factors. If any nonprime factors are visible then repeat the process of splitting into factors and make all prime factors. Then, completes the factor tree of a number 256 and express all the multiples of prime factors for 256 ie., 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2.