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X                    Y                  X – Y                              Factopedia
                          0                    0                 0 – 0 = 0

                                                                 0 – 1 = 1
                          0                     1           (borrow 1, so that
                                                                 10 – 1 = 1)
                           1                   0                 1 – 0 = 1

                           1                    1                1 – 1 = 0

                 For example, let us subtract the binary number (111)  from (1000) .            Google’s first ever
                                                                    2
                                                                                  2
                                          1     1                                                tweet on Twitter
                                     0  (10)  (10)  (10)  _____  Borrow                         was “I’m 01100110
                                                                                                01100101 01100101
                                     1    0    0     0                                          01101100 01101001
                                  –       1     1    1                                           01101110 01100111
                                     0    0    0     1                                         00100000 01101100
                                                                                                01110101 01100011
                                                                                                 01101011 01111001
                         Let’s CatCh uP
                                                                                                00001010” which
                   Subtract the binary number 1001 from 10001.                                when translated from
                                                                                              binary to English, says
                                                                                                “I’m feeling lucky.”









                                           Tech Fact
                     Modern day binary number system was invented by
                                   Gottfried Lebiniz in 1679.






                           Let’s BaCk-uP                                                         If you multiply a
                                                                                                 number by 9 and
                       A number system is simply a manner of counting.                         add the digits of the

                       The decimal  number  system  consists  of ten  digits  from             resulting number till
                     0 to 9.                                                                   the result is 1 digit, it
                      The binary number system consists of two digits 0s and 1s.                 will always be 9.
                                                                                                   For example,
                       The octal number system is used as a shorthand representation               45 x 9 = 405
                     of long binary numbers.
                                                                                                   4 + 0 + 5 = 9
                       The hexadecimal number system consists of 16 digits from 0
                     to 9 and A to F.


                                                                                                  Number System    13
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