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    1                                Number System

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                             Number System                                    Decimal to Binary Conversion
                             Binary to Decimal Conversion                     Operations on Binary Numbers

                      Let’s PLug-in                                                                       Interdisciplinary

                       Solve the following sums. Also note the time you took to solve each of them.

                       1.  345678 – 789 =    _______               (Time taken to solve:  _______)
                       2.  567 x 55 =        _______               (Time taken to solve:  _______)
                        3.  100 x 9 + 890 – 67 =  _______          (Time taken to solve:  _______)

                        4.  22/11 + 20 – 4 x 2 =   _______         (Time taken to solve:  _______)
                        Do you know how computer solves these sums and how quickly it does it? Let's find out in this chapter.

                     A computer takes data from a user and produces result as information. Although the words data
                     and information are often used interchangeably, but there is an important distinction between the
                     two words. In the strict sense, data consists of the raw numbers that computers organise to produce
                     information.

                     From an early age, we are introduced to the concept of numbers and counting. Toddlers learn at an
                     early age that they can carry two cookies, one in each hand. Kindergarteners start counting by twos
                     and fives. Invariably, we use the decimal number system. Our number system is based on 10, most
                     likely because we have 10 fingers. Let us learn more about the number system.

                                                               Tech Fact

                           The numerical digits, we use today, i.e., 1, 2 and 3 are based on the Hindu-Arabic
                          numeral system.
                          Different names for the number 0 include zero, nought, naught, nil, zilch and zip.

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