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  1. or download this
    100 = 64 + 32 + 4 = 2 ^ 6  + 2 ^ 5 + 2 ^ 2
                  = 1100100
  2. or download this
    10 ^ -1 = 0.1 
10 ^ -2 = 0.01
10 ^ -3 = 0.001
  3. or download this
    2 ^ -1 = 1/2
2 ^ -2 = 1/4
2 ^ -3 = 1/8
binary 1010.1010 = 2 ^ 3 + 2 ^ 1 + 2 ^ -1 + 2 ^ -3 = decimal 10.625