X5² (any number with units digit 5)

Formulas :

First 2 digits = [ __ x ( __ + 1)]

Last 2 digits = __²

Example :

95²

First 2 digits = [9 × ( 9 + 1 )]

= (9 × 10)

= 90

Last 2 digits = 5²

= 25

So, 95² = 9025