Square any two digits number that ends with 5

Square any two digits number that ends with 5
Calculating the square of a number below 100 is extremely simple. If you wantto find the square of 25 for example, you simply have to take the first digit (2), multiply it for the next highernumber (3), and then add 25 to the result.
For example

1). 25*25
now,
(2*3)25=625

2). 75*75
now,
(7*8)25=5625

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