Let's calculate 8385 x 9664
8385 × 9664 = 9664 × (8385)
+ 9664 × 5 that is equal 48320
+ 9664 × 80 that is equal 773120
+ 9664 × 300 that results in 2899200
+ 9664 × 8000 resulting in 77312000

= 81032640
