Alright, let's work through 8001 times 9905 step by step
8001 × 9905 = 9905 × (8001)
+ 9905 × 1 producing 9905
+ 9905 × 00 yielding 0
+ 9905 × 000 what gives us 0
+ 9905 × 8000 yielding 79240000

= 79249905
