Binary adders are known as important elements in the circuit designs. Many fastest adders have been created and developed. Carry tree adders are one among them. Also known as parallel prefix adders. The authors use adders frequently in digital design and VLSI designs, in digital design they use adders such as half adder and full adder. By using both adders, they can implement ripple carry adder, using ripple carry adder they can perform addition for any number of bits.