9X x 9X (tens digit is 9, units digit is 0-9)

Formulas :

First digits = 100 - [( 100 - 9__ ) + ( 100 - 9__ )]

Second digits = ( 100 - 9__ ) × (100 - 9__ )

Example :

97 × 96

First digits = 100 - [( 100 - 97 ) + ( 100 - 96 )]

= 100 - 7

= 93

Second digits = ( 100 - 97 ) × ( 100 - 96 )

= 12

So, 97 × 96 = 9312