Question:৯.> গুণ কর: 

   ক.` 0.3 xx 0.6`

   খ.` 2.4 xx 0.81`

   গ.` 0.62 xx 0.3`

   ঘ. `42.18 xx 0.28` 

Answer ক. 0.3` = (3 - 0)/9`

         `= 3/9 = 1/3`

 এবং 0.6` = (6 - 0)/9` 

           `= 6/9 = 2/3`

           :.` 0.3 xx 0.6` 

          `= 1/3 xx 2/3`

         ` = 2/9`  

            = 0.2  

   :. নির্ণেয় গুলফল = 0.2

      

  খ.  2.4`= (24 - 2)/9`

          `= (22)/9`

 এবং 0.8 `= (81 - 0)/(99)`

           `= (81)/(99)`

           `= 9/(11)`

 :. `2.4 xx 0.81 = (22)/9 xx 9/(11) = 2`

 :. নির্ণেয় গুণফল = 2

  গ. `0.62 = (62 - 6)/(90)`

             `= (56)/(90)`

             `= (28)/(45)`

   0.3 ` = (3 - 0)/9 `

         `= 3/9 = 1/3`

 :. `0.62 xx 0.3 = (28)/(45) xx 1/3`

                      `= (28)/(45 xx 3)`

                     ` = (28)/(135)`

                     ` = 0.2074074`.........

                     ` = 0.2074`

     নির্ণেয় গুণফল = 0.2074

  ঘ.  42.18`= (4218 - 42)/(99)`

              `= (4176)/(99)`

    0.28` = (28 - 2)/(90)`

            `= (26)/(90)`

 :. `42.18 xx 0.28 = (4176)/(99) xx (26)/(90)`

                         `= (464)/(11) xx (13)/(45)`

                         `= (464 xx 13)/(11 xx 45)`

                         `= (6032)/(495)`

                           = 12.1858585....

                           = 12.185

     :. নির্ণেয় গুণফল = 12.185 

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