Alright, let's work through 8129 times 9623 step by step
8129 × 9623 = 9623 × (8129)
+ 9623 × 9 producing 86607
+ 9623 × 20 what gives us 192460
+ 9623 × 100 that is equal 962300
+ 9623 × 8000 yielding 76984000

= 78225367
