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Two's complement is not the only way to represent a negative number. One's complement simply involves flipping the bits (without any addition) to flip the sign. The most significant bit still represents the sign (i.e., 0 is positive, and 1 is line Two's complement yields the same number of negative and positive numbers, so there is a balance on the number Two's complement avoids having to detect two different notations for the value 0 i.e., +0 and-0) Two's complement avoids overflow, while one's complement does not We cannot perform standard addition and subtraction correctly with one's complement, so two's complement is required for arithmetic