how do you tell the difference between fusion and fission equations?

fission ------- breaking of big nucleus to smaller e.g.
 235 --1       --------------139----94--------1
 U  + n ---------------->   Ba +  Kr    + 3n
92----0-----------------56-----36------0
 i.e . one  uranium atom  splits in one barium atom,one  krypton& 3 neutrons & huge amount of energy
  is released
-------------------------------------------------------------------------------------------------------------------
 fussion --------- to form bigger  nucleus by combining smaller  e.g.
  1---------------------4---------0
 4 H------------------> He + 2 e
 1-----------------------2-------+1
 i.e. four hydrogen atoms combine to form  one helium atom & 2 positrons&huge amount of energy
 is released