EduportalBD.comIf you need to square a 2 digit number end with 5, you can do it very easily using this trick.
>add 1 with first digit, then mulitply it by itself, and put 25 on the end. That is all!
25 suare = [2x(2 1)] & 25
2 x 3 = 6
try it!!! try it!!!!