Change it to 256x49
Then an easy way to do this is
256 x 100 = 25600
25600/2 = 12800 (this is the same as times 50)
Then - 256 because you only need times 49
So 12800- 256 = 12544
Then you moved the decimal place 3 times to the right in the first equation so move it back 3 times to the left
Son the answer is 12.544