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              123,45
              ||| ||
  10^ 2=100---+|| ||
  10^ 1= 10----+| ||
  10^ 0=  1-----+ ||
  10^-1=0,1-------+|
  10^-2=0,01-------+

1:
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            10010,011
            ||||| |||
   2^ 4= 16-+|||| |||
   2^ 3=  8--+||| |||
   2^ 2=  4---+|| |||
   2^ 1=  2----+| |||
   2^ 0=  1-----+ |||
   2^-1=0,5-------+||
   2^-2=0,25-------+|
   2^-3=0,125-------+