4 bit adders can be used to develop full adders and also subtractors there is a bit in the IC which can be set to make it work as a subtractor or as a adder two 4-bit adders can be joined with last carry bit to develop 8 bit adder i think the ic is 7483
you can do 1s complement and 2s complement operations on it directly a multiple is not possible but other ic's like 74261 2-bit by 4-bit Parallel Binary Multiplier 74274 4-bit by 4-bit Binary Multiplier 74284 4-bit by 4-bit Parallel Binary Multiplier
74285 4-bit by 4-bit Parallel Binary Multiplier 74508 8-bit Multiplier/Divider