Abstract: A carry save adder (CSA) is adapted for use in dividing operations by providing it with a lookahead capability whereby it accurately predicts whether or not each of the proposed complemental subtractions in a division process could be successfully performed if actually attempted, and it actually performs only those subtractions that will not result in overdrafts. Each bit position of the carry save adder is arranged to receive sum, carry and data inputs and to furnish sum, carry, presum and precarry outputs. The sum and carry output bits are latched and remain undisturbed until the next complemental subtraction is performed.