Trick to calculate square of two digit numbers...

From 26 to 50:-

trick:- square of x (x= 26 to 50) = (x-25)/ (50-x)square

ex.- square of 46 = (46-25)/(50-46)square

= 21/16= 2116 Ans.

square of 42 = (42-25)/(50-42)square

= 17/64= 1764

square of 37 = (37-25)/(50-37)square

= 12/ 169= 1369(take last two digits only, rest in reminder)

square of 29 = (29-25)/ (50-29)square

= 4/441 = 841