Mathematical tricks to square numbers
by satheeshkumar[ Edit ] 2012-07-11 17:27:36
If you need to square a 2 digit number ending in 5, you can do so very easily with this trick. Mulitply the first digit by itself + 1, and put 25 on the end. That is all!
for eg.
25^2 = (2x(2+1)) & 25
2 x 3 = 6
625
So you can square easily any number ending with 5..
