To find the square of any two digit number ending with 5, multiply the first digit by itself plus 1 then put 25 after it.
Example
35 x 35 = ?
First digit is 3 multiplied with 3+1 equal to 4.
3x4=12 , then put 25 after it.
35 x 35 = 1225
More examples
65 x 65 = ?
6x7 = 42
65 x 65 = 4225
75 x 75 = ?
7x8 = 56
75 x 75 = 5625
#Matamata
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