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Yaavadunam Tavadunikrtya Sutra


Definition : Whatever the deficiency subtract that deficit from the number and write along side the square of that deficit


We have placed '0' before 36 as the final output should be a six-digit number . The above method is similar for numbers like 96 2 , 9988 2 , etc...

In case of Surplus , the above sutra sounds true for any numbers close to the powers of 10


Carrying over is done for each value of hundredth place value except for '0'. The above method is similar for numbers like 106 2 , 908 , etc...

Algebric Proof :

Let 'x' be the base  and 'y' be the deficit .The numbers near or less than power of "10" can be treated as ( x - y ).

That is , 9  = ( 10 - 1)
            994 = ( 1000 - 6 )
            96 = ( 100 - 4 ) , etc...

( x - y ) 2 =  x 2 - 2 x y + y 2
              = x ( x - 2y) + y 2
              = x [ ( x - y ) - y ] + y 2
              = base [ (number) - deficiency ] + deficit2
Thus ,
985 2
which can be written as  ( 1000 - 15 )
(or) = 1000 [ ( 985 - 15 )] + 15 2
= 970000 + 225
= 970225
Therefore , 985 = 970225


Read Also :
Simple and Effective Trick for BASE 50




1 comments:

  1. I've used this method. But now i find multiplying 3 digits using another one easier than the above said. This method reduces time only if the number has more 9s.

    ReplyDelete

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