sistema numérico binario

   256  128   64     32     16       8       4       2      1
  2^8  2^7  2^6   2^5  2^4   2^3   2^2   2^1  2^0
                                                0       1         1        1  =  7 dec
                                                1       0         1        0  = 10 dec
                              1       0       1       0         0        0 =  40 dec

ejemplos:

     binario                decimal
      1001101    -----  77 dec
        110011   ------  51 dec
          10111   ------  23 dec
        001101   ------  13 dec

   
       1000       100        10          1
      10^3     10^2     10^1    10^0                                             
          0             1          5          3           3*1 + 5*10 + 1 *100=    153
                         3         0           6