Here is an Easy way to find Squares of numbers which contain 5 as their last digit..

Consider the digits written before 5 as a single number and multiply it be its succcessor and then write it and put 25 as the last two digits of it...

For example:

to find square of 15::  (1*2)=2 and then write 25 at the end ,ie. 225

similarly to find square of 25:: (2*3)=6 and then write 25 at the end i.e, 625

for finding square of 105:: (10*11)=110 and then write 25 at the end ,i.e, 11025

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