Using 4-bit adders to create a 1See Section 6-bit adder:

• requires 16 adders.
• requires 4 adders.
• requires the carry-out of the less significant adder to be connected to the carry-in of the next significant adder.
• requires 4 adders and the connection of the carry out of the less significant adder to the carry-in of the next significant adder.