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117 votes
Minimum Number of Gates: Nand/Nor
  Exor Exnor Half Adder Half Subtractor Full Adder Full Subtractor
$NAND$ $4$ $5$ $5$ $5$ $9$ $9$
$NOR$ $5$ $4$ $5$ $5$ $9$ $9$

Exor Using Nand Gates 

Exor Using Nor Gates

Ex-Nor using Nand Gates 

Ex-Nor using Nor Gates 

Half Adder using Nand Gates 

Half Adder Using Nor Gates 

Half Subtractor using Nand Gates

Half Subtractor using Nor gates

Full Adder using Nand Gates 

Full Adder using Nor gates

Full Subtractor using Nand Gates

Full Subtractor using Nor Gates 

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2 votes
2 votes
  EX-OR EX-NOR HALF ADD HALF SUB FULL ADD FULL SUB
NAND 4 5 5 5 9 9
NOR 5 4 5 5 12 12

 

2 votes
2 votes
gates nand nor
not 1 1
and 2 3
or 3 2
xor 4 5
exnor 5 4

 

This is the best

TIPS: 

  1. If they ask NAND gates, use Sum of Products
  2. If they ask NOR gates, use Product of sums

Goodbye

0 votes
0 votes
EX- OR : 4 NAND, 5 NOR

EX- NOR: 5 NAND, 4 NOR

Half Adder, Half Subtractor: 5 NAND, 5 NOR

Full Adder, Full Subtractor: 9 NAND, 9 NOR

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