Full adder circuit and BCD to decimal.

Other Hardware General Electronics
6

I plan on using:

2x quad AND gates ic

2x quad OR gates ic

1x quad XOR gate ic

using this diagram:
File:Full-adder logic diagram.svg - Wikipedia

With that circuit I'd get 2x the XOR chip and 1x the OR chip. In fact I'd get a spare of each too in case one gets damaged...