leave 6 , now multiply the (first part) with (first part+1). put the result in first
then add (2* first part) with the first digit of (6^2 or 36) that means with 3.if here an excess is present then add that with the result of multiplication.
and at last put 6
...................................................
EX:-
26^2= (2*3) (2*2+3) 6 = 676
46^2= (4*5) (4*2+3) 6 = (20+1) 1 6 = 2116
then add (2* first part) with the first digit of (6^2 or 36) that means with 3.if here an excess is present then add that with the result of multiplication.
and at last put 6
...................................................
EX:-
26^2= (2*3) (2*2+3) 6 = 676
46^2= (4*5) (4*2+3) 6 = (20+1) 1 6 = 2116
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