A method of operating a data processing system when determining an unsigned normalized integer representation U of a number x is disclosed. When the number x has a value between 0 and 1, it is determined 31 whether the number x is greater than or equal to 0.5. When it is determined that the number x is greater than or equal to 0.5, the bit of the binary representation of the number x that represents the value 0.5 is inverted 32, and the unsigned normalized integer representation U of the number x is determined using the value of the binary representation of the number x having its bit that represents the value 0.5 inverted.