The Sutra Ekanyunena purvena comes as a Sub-sutra to Nikhilam which gives
the meaning 'One less than the previous' or 'One less than the one before'.
1) The use of this sutra in case of multiplication by 9,99,999.. is as follows .
Method :
a) The left hand side digit (digits) is ( are) obtained by applying the ekanyunena
purvena i.e. by deduction 1 from the left side digit (digits) .
e.g. ( i ) 7 x 9; 7 – 1 = 6 ( L.H.S. digit )
b) The right hand side digit is the complement or difference between the
multiplier and the left hand side digit (digits) . i.e. 7 X 9 R.H.S is 9 - 6 = 3.
c) The two numbers give the answer; i.e. 7 X 9 = 63.
