Sunday, 20 November 2011

Multiplying five-digit numbers by two digit

              Example : 48156 x 63 = 3033828

                               Board
              1      4      8      1      5      6
              2     08    16    02    10    12
                  12    24    03    15    18
              4     16    32    04    20    24
              5     20    40    05    25    30
              6     24    48    06    30    36
              7     28    56    07    35    42
              8     32    64    08    40    48
              9     32    72    09    45    54
               
              Add up these numbers
              3 x 4                         =      12
              3 x   8                       =        24
              3 x     1                     =           03
              3 x       5                   =             15
              3 x         6                 =   +          18
                                                        144468

              Add up these numbers
              6 x 4                         =       24
              6 x   8                       =         48
              6 x     1                     =           06
              6 x       5                   =             30
              6 x         6                 =    +         36
                                                        288936

                                                         48156
                                                  x           63
                                                       144468
                                                 +  288936  
                                                     3033828

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