Maths preprations with a difference

         And we multiply the last figures: 2 x 8 = 16 to
         get the last part of the answer

      
Method for multiplying numbers where the first figures add up 10 and and the last figures are same
44X64 

Here first figures are 4 and 6 and their add up 10 and unit figures of both number are same 
 Just multiplying the last figures 4x4=16 Put it right hand side 
 Again multiplying the first figures and add common degit(4x6 )+4=24+4=28 put it left hand side  Now we get required answer2816
Similerly 36x76 ,   6X6 =36 right hand side  , (3x7)+6= 21+6=27 left hand side 
Required answer is 2736
NOTE  If multiplication of last figures is less than 10  add zero before unit degit
Ex  81x21 , 1x1=01,( 8x2)+1= 16+1=17  Required answer 1701

Method for  multiplying   numbers where the first number"s add up10 and and the second  number's degits are same
46X55

Here first number's add up is 10  and second number "s degits  are common i.e 5
Just multiplying last figures of both nubers 6x5 =30 put it right hand side 
Again muliplying first figures of both numers and add common degit of second number
(4x5)+5 =20+5 =25 put it left  hand side 
Required answer is 2530 ( If multiplication is in unit in first step add zero before it)

Multiplying numbers just over 100.

108 x 109 = 11772

The answer is in two parts: 117 and 72,
117 is just 108 + 9 (or 109 + 8),
and 72 is just 8 x 9.

Similarly 107 x 106 = 11342

 HOW USEFUL IS THIS CALCULATION!
EXAMPLE
Compute  the amount and the compound intrest on Rs 10000.00 on 2.years at4%per annum.
          
                       
                  Now 4x4=16 and 4+4=8   put 10  it becomes Rs 10816.00
 How simple  ! no calculation no extra time !

  
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