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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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