Number 5 magic

Square the number conatianing 5 in unit place
5 * 5 = 25
15 * 15 = 225
25 * 25 = 625
35 * 35 = 1225
Logic: square the unit place digit i.e is 5, which will be 25. Now increase the 10's place digit i.e 1 by 1 and multiply with 10's place digit (i.e. 2*1) and write answer like this 225. Remember 25 should be written in the rightmost.