XX x XX (same units digit, the total number of tens digit is 10)

Formulas :

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

Last 2 digits = __ x __

Example :

42 × 62

First 2 digits = [( 4 × 6 ) + 2]

= 26

Last 2 digits = 2 × 2

= 04

So, 42 × 62 = 2604