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Hi friends here is a trick to multiply a number to itself that is ending with five.
for example:
15*15
25*25
35*35
45*45
and so no.

To do the multiplication just multiply the number before 5 with the next number and then put it along with 25(5*5).

for example:

consider multiplication of 105*105

The number before 5 is 10 here and the next number after 10 is 11 so (10*11=110)
so the answer is 11025.

similarly multiplication of 125*125 is done by

(12*13)=156
(5*5)=25
hence result is 15625.